https://w3id.org/nfdi4cat/voc4cat
The Voc4Cat vocabulary is a collection of concepts (or "terms") from the field of catalysis and related disciplines such as chemical engineering or materials science. For each concept, Voc4Cat provides a unique resolvable persistent identifier and a carefully written textual definition, which reflects the community’s shared understanding of the concept’s meaning.
By using the identifiers provided by Voc4Cat to annotate data, rather than just words and symbols, ambiguity as to what is meant is avoided. Producing Voc4Cat-annotated data contributes to realising the vision of machine-actionability described as the ultimate goal of the FAIR principles.
See also voc4cat help.
URI | https://w3id.org/nfdi4cat/voc4cat_0001900 |
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Definition | A collection of concepts referring to material characterization techniques and methods to evaluate their efficiency in photocatalysis. |
Members | atomic force microscopycon, Brunauer-Emmett-Teller surface area analysiscon, cyclic voltammetrycon, differential scanning calorimetrycon, electron energy loss spectroscopycon, Fourier transform infrared spectroscopycon, gas chromatographycon, liquid chromatographycon, mass spectrometrycon, Mott-Schottky analysiscon, nuclear magnetic resonance spectroscopycon, photoluminescencecon, Raman spectroscopycon, scanning electron microscopycon, thermogravimetric analysiscon, transmission electron microscopycon, ultraviolet-visible spectroscopycon, X-ray diffractioncon, X-ray fluorescencecon, X-ray photoelectron spectroscopycon |
URI | https://w3id.org/nfdi4cat/voc4cat_0000001 |
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Definition |
A process which catalyzes a chemical reaction through the absorption of sufficient light energy by a photocatalyst. |
Broader Concepts |
catalysis research fieldcon |
URI | https://w3id.org/nfdi4cat/voc4cat_0000002 |
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Definition |
A material that absorbs photons (light) of appropriate energy and initiates or accelerates a photochemical reaction, while it regenerates itself after each reaction cycle. |
Broader Concepts |
catalystcon |
URI | https://w3id.org/nfdi4cat/voc4cat_0000003 |
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Definition |
A material with electrical conductivity between that of a conductor and an insulator. |
Broader Concepts |
materialcon |
URI | https://w3id.org/nfdi4cat/voc4cat_0000004 |
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Definition |
Broad families of semiconducting materials (e.g., metal oxides) that can be used as catalysts in various applications. |
Broader Concepts |
attributescon |
URI | https://w3id.org/nfdi4cat/voc4cat_0000005 |
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Definition |
A chemical compound formed by the reaction of a metal with oxygen. |
Broader Concepts |
materialcon |
URI | https://w3id.org/nfdi4cat/voc4cat_0000006 |
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Definition |
Characteristic properties of a semiconductor used in catalysis. These properties determine its performance in the studied catalytic application. |
Broader Concepts |
attributescon |
URI | https://w3id.org/nfdi4cat/voc4cat_0000007 |
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Definition |
The energy level in a semiconductor where the probability of finding an electron is 0.5. |
Broader Concepts |
non-temporal abstract entitycon |
URI | https://w3id.org/nfdi4cat/voc4cat_0000008 |
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Definition |
The degree of a three-dimensional structural order of atoms which constitute the crystal lattice of a material. |
Broader Concepts |
attributescon |
URI | https://w3id.org/nfdi4cat/voc4cat_0000009 |
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Definition |
The range of pore sizes in a material. |
Broader Concepts |
attributescon |
URI | https://w3id.org/nfdi4cat/voc4cat_0000010 |
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Definition |
The energy difference between a semiconductor’s valence band top and conduction band bottom, which is required to excite an electron from the former to the latter. |
Broader Concepts |
attributescon |
URI | https://w3id.org/nfdi4cat/voc4cat_0000011 |
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Definition |
The band of energy levels in a solid fully occupied by electrons at 0 K (273.15 °C). |
Broader Concepts |
non-temporal abstract entitycon |
URI | https://w3id.org/nfdi4cat/voc4cat_0000012 |
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Definition |
The energy band of electronic levels of partially or fully filled mobile electrons in a metal or a semiconductor. |
Broader Concepts |
non-temporal abstract entitycon |
URI | https://w3id.org/nfdi4cat/voc4cat_0000013 |
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Definition |
Α measure of the total surface area of a material per unit mass or volume. |
Broader Concepts |
attributescon |
URI | https://w3id.org/nfdi4cat/voc4cat_0000014 |
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Definition |
Techniques used to modify the properties of a catalyst, with the aim to increase its efficiency in a catalytic application. |
Broader Concepts |
processescon |
Narrower Concepts |
dopingcon |
URI | https://w3id.org/nfdi4cat/voc4cat_0000015 |
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Definition |
The introduction of foreign atoms into a semiconductor leading to the formation of new energy levels and charge concentrations. |
Broader Concepts |
modification techniquecon |
URI | https://w3id.org/nfdi4cat/voc4cat_0000016 |
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Definition |
The form in which the catalyst is introduced to the reaction chamber. This can include e.g., powders, pellets or thin films deposited on a substrate. |
Broader Concepts |
attributescon |
URI | https://w3id.org/nfdi4cat/voc4cat_0000017 |
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Definition |
A catalyst introduced to the reaction chamber in the form of a powder. |
Broader Concepts |
catalystcon |
URI | https://w3id.org/nfdi4cat/voc4cat_0000018 |
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Definition |
Mass of a powdered catalyst used for an experiment. |
Broader Concepts |
attributescon |
URI | https://w3id.org/nfdi4cat/voc4cat_0000019 |
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Definition |
A catalyst introduced to the reaction chamber in the form of a thin film. To form a thin film, a (powdered) catalyst is deposited on a substrate (e.g., glass or metal) using an appropriate deposition technique. |
Broader Concepts |
catalystcon |
URI | https://w3id.org/nfdi4cat/voc4cat_0000020 |
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Definition |
A technique used to deposit (immobilize) a (powdered) catalyst on a substate. These techniques include (but are not limited to): doctor blading, spin coating, spray coating, etc.. |
Broader Concepts |
processescon |
Narrower Concepts |
doctor bladingcon spray coatingcon spin coatingcon |
URI | https://w3id.org/nfdi4cat/voc4cat_0000021 |
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Definition |
A technique used to deposit uniform thin films onto a substrate by spraying a solution of the material onto the surface. |
Broader Concepts |
deposition techniquecon |
URI | https://w3id.org/nfdi4cat/voc4cat_0000022 |
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Definition |
A tape-casting method used to deposit thin films of a catalyst onto the surface of a substrate. |
Broader Concepts |
deposition techniquecon |
URI | https://w3id.org/nfdi4cat/voc4cat_0000023 |
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Definition |
A technique used to deposit uniform thin films onto a substrate (e.g., metal or glass) by spinning at high speeds a solution (paste) of the material onto the surface. |
Broader Concepts |
deposition techniquecon |
URI | https://w3id.org/nfdi4cat/voc4cat_0000024 |
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Definition |
The substate onto which a (powdered) catalyst is deposited. Such substrates include glass surfaces (e.g., borosilicate glass or conductive glass like ITO and FTO), ceramic substrates (e.g., alumina) or metal substrates (e.g., Ti foils, stainless steel etc.). |
Broader Concepts |
materialcon |
Narrower Concepts |
metallic substratecon ceramic substratecon glass substratecon |
URI | https://w3id.org/nfdi4cat/voc4cat_0000025 |
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Definition |
The material that the substrate is made of. Common materials include: glass (conductive or not), ceramics and metal. |
Broader Concepts |
attributescon |
URI | https://w3id.org/nfdi4cat/voc4cat_0000026 |
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Definition |
A flat surface made of a metal (e.g., titanium, stainless steel) serving as a substrate for the deposition of a catalyst. |
Broader Concepts |
substratecon |
URI | https://w3id.org/nfdi4cat/voc4cat_0000027 |
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Definition |
A flat surface made of glass serving as a substrate for the deposition of a catalyst. |
Broader Concepts |
substratecon |
Narrower Concepts |
quartz glasscon borosilicate glasscon fluorine doped tin oxide coated glasscon indium tin oxide coated glasscon |
URI | https://w3id.org/nfdi4cat/voc4cat_0000028 |
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Definition |
Transparent conductive metal oxide (fluorine doped tin oxide) that can be used in the fabrication of transparent electrodes for thin films. |
Broader Concepts |
glass substratecon |
URI | https://w3id.org/nfdi4cat/voc4cat_0000029 |
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Definition |
Transparent conductive metal oxide (indium tin oxide) that can be used in the fabrication of transparent electrodes for thin films. |
Broader Concepts |
glass substratecon |
URI | https://w3id.org/nfdi4cat/voc4cat_0000030 |
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Definition |
A resistant to thermal shock type of glass, composed mainly of silica and boron trioxide. |
Broader Concepts |
glass substratecon |
URI | https://w3id.org/nfdi4cat/voc4cat_0000031 |
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Definition |
A type of pure silicon dioxide, highly crystalline glass that allows the transmission of light in the UV wavelength range. |
Broader Concepts |
glass substratecon |
URI | https://w3id.org/nfdi4cat/voc4cat_0000032 |
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Definition |
A surface made of a ceramic material (e.g., alumina) serving as a substrate for the deposition of a catalyst. |
Broader Concepts |
substratecon |
URI | https://w3id.org/nfdi4cat/voc4cat_0000033 |
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Definition |
The diamensions of the substrate. |
Broader Concepts |
attributescon |
Narrower Concepts |
substrate widthcon substrate thicknesscon substrate depthcon substrate areacon |
URI | https://w3id.org/nfdi4cat/voc4cat_0000034 |
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Definition |
The width of the substrate. |
Broader Concepts |
substrate dimensioncon |
URI | https://w3id.org/nfdi4cat/voc4cat_0000035 |
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Definition |
The depth of the substrate. |
Broader Concepts |
substrate dimensioncon |
URI | https://w3id.org/nfdi4cat/voc4cat_0000036 |
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Definition |
The thickness of the substrate. |
Broader Concepts |
substrate dimensioncon |
URI | https://w3id.org/nfdi4cat/voc4cat_0000037 |
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Definition |
The surface area of the substrate. |
Broader Concepts |
substrate dimensioncon attributescon |
URI | https://w3id.org/nfdi4cat/voc4cat_0000038 |
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Definition |
A thin film of the catalyst deposited on an appropriate for the application substrate. |
Broader Concepts |
catalystcon |
URI | https://w3id.org/nfdi4cat/voc4cat_0000039 |
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Definition |
Mass of catalyst deposited onto the surface of a substrate. |
Broader Concepts |
attributescon |
URI | https://w3id.org/nfdi4cat/voc4cat_0000040 |
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Definition |
The diamensions of the - deposited on the substrate - thin film. |
Broader Concepts |
attributescon |
Narrower Concepts |
thin film widthcon thin film areacon thin film thicknesscon thin film depthcon |
URI | https://w3id.org/nfdi4cat/voc4cat_0000041 |
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Definition |
The width of the film of the deposited catalyst. |
Broader Concepts |
thin film dimensioncon |
URI | https://w3id.org/nfdi4cat/voc4cat_0000042 |
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Definition |
The thickness of the film of the deposited catalyst. |
Broader Concepts |
thin film dimensioncon |
URI | https://w3id.org/nfdi4cat/voc4cat_0000043 |
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Definition |
The depth of the film of the deposited catalyst. |
Broader Concepts |
thin film dimensioncon |
URI | https://w3id.org/nfdi4cat/voc4cat_0000044 |
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Definition |
The area of the substrate covered by the deposited catalyst. |
Broader Concepts |
thin film dimensioncon |
URI | https://w3id.org/nfdi4cat/voc4cat_0000045 |
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Definition |
The process by which one or more chemical reactions are performed with the aim of converting a reactant or starting material into a product or multiple products. |
Broader Concepts |
processescon |
URI | https://w3id.org/nfdi4cat/voc4cat_0000046 |
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Definition |
Thorough search of available literature on the research topic of interest using online research platforms (e.g, Scopus, Google Scholar, Web of Science, Research Gate etc.) and / or libraries. Relevant literature can be found in the form of publications, books, abstracts and conference presentations. |
Broader Concepts |
actionscon |
Narrower Concepts |
literature collectioncon literature organizationcon |
URI | https://w3id.org/nfdi4cat/voc4cat_0000047 |
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Definition |
Assembly of literature research to include only the most relevant sources of information for the application / experiment / catalysts of interest. |
Broader Concepts |
literature researchcon |
URI | https://w3id.org/nfdi4cat/voc4cat_0000048 |
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Definition |
Addition and organization of relevant literature of interest using a citation management software (e.g., Mendeley, Zotero, EndNote etc.) allowing for easy access and categorization. |
Broader Concepts |
literature researchcon |
URI | https://w3id.org/nfdi4cat/voc4cat_0000049 |
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Definition |
Necessary steps needed to follow to reach the desired catalyst. |
Broader Concepts |
processescon |
URI | https://w3id.org/nfdi4cat/voc4cat_0000050 |
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Definition |
Duration of each synthesis step needed to synthesize the desired catalyst. |
Broader Concepts |
attributescon |
URI | https://w3id.org/nfdi4cat/voc4cat_0000051 |
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Definition |
Temperature externally applied (if necessary) in any of the synthesis step. Higher temperature values can be observed if an exothermic reaction takes place during the synthesis. |
Broader Concepts |
attributescon |
URI | https://w3id.org/nfdi4cat/voc4cat_0000052 |
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Definition |
The pH value in each of the synthesis steps. |
Broader Concepts |
attributescon |
URI | https://w3id.org/nfdi4cat/voc4cat_0000053 |
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Definition |
Pressure applied (if necessary) in any of the synthesis step. Changes in the pressure may be observed if variations in the temperature of the reaction occur (e.g., exothermic reaction). |
Broader Concepts |
attributescon |
URI | https://w3id.org/nfdi4cat/voc4cat_0000054 |
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Definition |
Heat treatment to reach the desired final catalyst. The parameters of the heat treatment can vary between each calcination step. |
Broader Concepts |
attributescon |
URI | https://w3id.org/nfdi4cat/voc4cat_0000055 |
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Definition |
A gas flow under which the calcination step takes place (e,g,, Ar or synthetic air). |
Broader Concepts |
non-temporal abstract entitycon |
URI | https://w3id.org/nfdi4cat/voc4cat_0000056 |
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Definition |
The flow of gas (usually in ml min-1) used in the calcination steps during synthesis. |
Broader Concepts |
attributescon |
URI | https://w3id.org/nfdi4cat/voc4cat_0000057 |
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Definition |
Initial temperature of the calcination step. |
Broader Concepts |
attributescon |
URI | https://w3id.org/nfdi4cat/voc4cat_0000058 |
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Definition |
Final temperature of the calcination step. |
Broader Concepts |
attributescon |
URI | https://w3id.org/nfdi4cat/voc4cat_0000059 |
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Definition |
Rate of increasing or decreasing the temperature during the calcination step. Usually mentioned in K min-1. |
Broader Concepts |
attributescon |
URI | https://w3id.org/nfdi4cat/voc4cat_0000060 |
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Definition |
Time (usually in h) for which a desired temperature is held. |
Broader Concepts |
attributescon |
URI | https://w3id.org/nfdi4cat/voc4cat_0000061 |
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Definition |
Equipment used in each step of the synthesis of the catalysts. The equipment can include (but not limited to): crucibles, pH meters, condensers, volumetric cylinders, centrifuges, test tubes, flasks, beakers, mechanical shakers, pipettes, syringes, magnetic stirrers, heating plates, filters, funnels, and digital balances. |
Broader Concepts |
equipmentcon |
URI | https://w3id.org/nfdi4cat/voc4cat_0000062 |
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Definition |
Chemical substances used in the synthesis process of a desired catalyst. |
Broader Concepts |
non-temporal abstract entitycon |
URI | https://w3id.org/nfdi4cat/voc4cat_0000063 |
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Definition |
Mass of chemicals used for synthesis. |
Broader Concepts |
attributescon |
URI | https://w3id.org/nfdi4cat/voc4cat_0000064 |
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Definition |
Volume of chemicals used for synthesis. |
Broader Concepts |
attributescon |
URI | https://w3id.org/nfdi4cat/voc4cat_0000065 |
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Definition |
Concentration of chemicals used for synthesis. |
Broader Concepts |
attributescon |
URI | https://w3id.org/nfdi4cat/voc4cat_0000066 |
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Definition |
Techniques used to identify the (physico)chemical, morphological, structural, mechanical, optical and electrical properties of the syntesized catalysts. Characterization is performed after the synthesis of the catalysts to evaluate the success of the synthetic approach, but also after the completion of the evaluation of the materials in a reaction to ensure their stability under the selected experimental parameters. |
Broader Concepts |
processescon |
Narrower Concepts |
ultraviolet-visible spectroscopycon nuclear magnetic resonance spectroscopycon photoluminescencecon X-ray fluorescencecon transmission electron microscopycon Mott-Schottky analysiscon X-ray absorption spectroscopycon electron microscopycon Raman spectroscopycon electron energy loss spectroscopycon X-ray photoelectron spectroscopycon atomic force microscopycon Fourier transform infrared spectroscopycon X-ray diffractioncon thermogravimetric analysiscon Brunauer-Emmett-Teller surface area analysiscon differential scanning calorimetrycon scanning electron microscopycon |
URI | https://w3id.org/nfdi4cat/voc4cat_0000067 |
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Definition |
A non-destructive analytical technique which uses a high-energy X-ray source to expose a material and monitors the emitted characteristic fluorescent X-Rays. |
Broader Concepts |
characterization techniquecon |
URI | https://w3id.org/nfdi4cat/voc4cat_0000068 |
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Definition |
An analytical technique used to measure the energy loss of electrons passing through a sample. |
Broader Concepts |
characterization techniquecon |
URI | https://w3id.org/nfdi4cat/voc4cat_0000069 |
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Definition |
A spectroscopy technique studying the vibrational modes of molecules, by measuring the intensity and frequency of scattered by the sample of monochromatic light. |
Broader Concepts |
characterization techniquecon |
URI | https://w3id.org/nfdi4cat/voc4cat_0000070 |
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Definition |
A high-resolution imaging technique that measures the interaction between a sharp probe and the sample’s surface to create a three-dimensional image of the surface’s morphology. |
Broader Concepts |
characterization techniquecon |
URI | https://w3id.org/nfdi4cat/voc4cat_0000071 |
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Definition |
A thermal analysis technique which compares the heat flow in a sample and a reference material under controlled applied temperature profiles. |
Broader Concepts |
characterization techniquecon |
URI | https://w3id.org/nfdi4cat/voc4cat_0000072 |
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Definition |
A thermal analysis technique used to measure the change of a sample’s mass under the influence of controlled applied temperature profiles. |
Broader Concepts |
characterization techniquecon |
URI | https://w3id.org/nfdi4cat/voc4cat_0000073 |
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Definition |
A spectroscopic technique that uses a static magnetic field and radiofrequency radiation to measure the magnetic resonance of atomic nuclei protons or electrons. |
Broader Concepts |
characterization techniquecon |
URI | https://w3id.org/nfdi4cat/voc4cat_0000074 |
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Definition |
Light emission of lower energy photons from a sample upon its photoexcitation. |
Broader Concepts |
characterization techniquecon |
URI | https://w3id.org/nfdi4cat/voc4cat_0000075 |
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Definition |
An electron microscopy technique that produces high-resolution images under high magnification of a sample's surface by assessing the secondary and back-scattered electrons produced by a focused electron beam. |
Broader Concepts |
characterization techniquecon |
URI | https://w3id.org/nfdi4cat/voc4cat_0000076 |
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Definition |
A technique that analyzes the chemical composition of an X-ray irradiated sample by measuring the energies of the emitted electrons. |
Broader Concepts |
characterization techniquecon |
URI | https://w3id.org/nfdi4cat/voc4cat_0000077 |
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Definition |
A technique which analyses the diffraction pattern produced when X-rays are scattered by a sample bombarded by a focused electron beam. |
Broader Concepts |
characterization techniquecon |
URI | https://w3id.org/nfdi4cat/voc4cat_0000078 |
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Definition |
Transmission electron microscopy is a technique that produces high-resolution images if the internal structure of a sample by using a beam of electrons to bombard the thin sample and measuring the intensity of the scattered transmitted electrons. |
Broader Concepts |
characterization techniquecon |
URI | https://w3id.org/nfdi4cat/voc4cat_0000079 |
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Definition |
A technique used to measure the absorption, transmission or reflectance of light by a sample in the ultraviolet and visible regions of the electromagnetic spectrum. |
Broader Concepts |
characterization techniquecon |
URI | https://w3id.org/nfdi4cat/voc4cat_0000080 |
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Definition |
A spectroscopic technique used to study the vibrational modes of chemical bonds of a sample using infrared radiation. |
Broader Concepts |
characterization techniquecon |
URI | https://w3id.org/nfdi4cat/voc4cat_0000081 |
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Definition |
The study of physical adsorption of gas molecules on a solid surface for the calculation of the specific surface area of materials. |
Broader Concepts |
characterization techniquecon |
URI | https://w3id.org/nfdi4cat/voc4cat_0000082 |
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Definition |
An electrochemical technique used to study the redox properties of a sample by measuring the current produced by an applied voltage sweep. |
Broader Concepts |
voltammetrycon |
URI | https://w3id.org/nfdi4cat/voc4cat_0000083 |
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Definition |
A method used in cyclic voltammetry to determine the charge carrier concentration and the flat-band potential of an electrochemical system by measuring the capacitance as a function of applied voltage. |
Broader Concepts |
characterization techniquecon |
URI | https://w3id.org/nfdi4cat/voc4cat_0000084 |
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Definition |
The energy state occupied by an electron in a catalyst. This state can affect the electron's ability to participate in a catalytic reaction. |
Broader Concepts |
non-temporal abstract entitycon |
Narrower Concepts |
excited statecon ground statecon |
URI | https://w3id.org/nfdi4cat/voc4cat_0000085 |
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Definition |
Τhe lowest energy state of a system. |
Broader Concepts |
electronic statecon |
URI | https://w3id.org/nfdi4cat/voc4cat_0000086 |
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Definition |
Τhe temporary state of a system with higher energy than its ground state caused by an external factor. |
Broader Concepts |
electronic statecon |
URI | https://w3id.org/nfdi4cat/voc4cat_0000087 |
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Definition |
A multi-step process iniatiated by the absorption of photons by a photocatalyst. This process involves various sub-processes that include the photogeneration and transfer of electron and hole pairs. |
Broader Concepts |
processescon |
URI | https://w3id.org/nfdi4cat/voc4cat_0000088 |
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Definition |
The transfer of an electron initiated by the absorption of a photon of sufficient energy. |
Broader Concepts |
eventscon |
URI | https://w3id.org/nfdi4cat/voc4cat_0000089 |
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Definition |
The transfer of a hole initiated by the absorption of a photon of sufficient energy. |
Broader Concepts |
eventscon |
URI | https://w3id.org/nfdi4cat/voc4cat_0000090 |
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Definition |
The generation of electron - hole pairs in a semiconductor as a result of light absorption of sufficient energy to overcome the bandgap energy. Electrons (negative charge) get excited to the conduction band, while holes (positive charge) remain in the valence band. |
Broader Concepts |
eventscon |
URI | https://w3id.org/nfdi4cat/voc4cat_0000091 |
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Definition |
The process by which photogenerated charges (electrons and holes) in a semiconductor recombine, resulting in the dissipation of energy in the form of e.g., heat or light. |
Broader Concepts |
eventscon |
URI | https://w3id.org/nfdi4cat/voc4cat_0000092 |
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Definition |
Absorption is the process in which energy (e.g., photons) or an absorbent (e.g., a gas) is taken up by an absorbate. |
Broader Concepts |
eventscon |
URI | https://w3id.org/nfdi4cat/voc4cat_0000093 |
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Definition |
The adhesion of a gas, liquid or dissolved solid chemical of interest onto a solid surface. |
Broader Concepts |
eventscon |
URI | https://w3id.org/nfdi4cat/voc4cat_0000094 |
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Definition |
The process under which reactants, intermediates and products are released from the surface of the catalyst. Desorption can be facilitated by an increase in temperature or a change in the pH. |
Broader Concepts |
eventscon |
URI | https://w3id.org/nfdi4cat/voc4cat_0000095 |
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Definition |
The process of separating positive and negative charges in a semiconductor, typically as a result of an external force, (e.g., photoexcitation). |
Broader Concepts |
eventscon |
URI | https://w3id.org/nfdi4cat/voc4cat_0000096 |
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Definition |
The state caused by the transition of electrons from the valence band top to the conduction band bottom by absorption of photons of sufficient energy. |
Broader Concepts |
eventscon |
URI | https://w3id.org/nfdi4cat/voc4cat_0000097 |
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Definition |
The loss of electrons or an increase in the oxidation state of a species. |
Broader Concepts |
eventscon |
URI | https://w3id.org/nfdi4cat/voc4cat_0000098 |
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Definition |
The gain of electrons or a decrease in the oxidation state of a species. |
Broader Concepts |
eventscon |
URI | https://w3id.org/nfdi4cat/voc4cat_0000099 |
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Definition |
The light-driven reduction (conversion) of carbon dioxide (CO2) to hydrocarbons and / or platform chemicals in presence of water. The absorption of light and the adsorption of the reactants is performed by a photocatalyst (usually a metal oxide). |
Broader Concepts |
processescon |
URI | https://w3id.org/nfdi4cat/voc4cat_0000100 |
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Definition |
A lab-scale experiment performed to test the efficiency of a studied photocatalyst in a photocatalytic application. |
Broader Concepts |
processescon |
URI | https://w3id.org/nfdi4cat/voc4cat_0000101 |
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Definition |
A starting substance that undergoes a chemical reaction to produce a desired product. |
Broader Concepts |
non-temporal abstract entitycon |
URI | https://w3id.org/nfdi4cat/voc4cat_0000102 |
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Definition |
Concentration of the reactants used to perform an experiment. |
Broader Concepts |
attributescon |
URI | https://w3id.org/nfdi4cat/voc4cat_0000103 |
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Definition |
Purity of reactants used in an experiment. Purity is a measure of the impurities contained in the reactants' supply. The highest purity reactants should be used to ensure the collection of reliable results. |
Broader Concepts |
attributescon |
URI | https://w3id.org/nfdi4cat/voc4cat_0000104 |
---|---|
Definition |
The rate of flow of reactants (often in ml per min) in the photoreactor. Flow rates are usually controlled by mass flow controllers (MFCs). |
Broader Concepts |
attributescon |
URI | https://w3id.org/nfdi4cat/voc4cat_0000105 |
---|---|
Definition |
Electron donors or hole scavengers used to reduce the recombination tendency of electrons and holes. Sacrificial reagents are used in catalysis to study an oxidation or reduction reaction separately. |
Broader Concepts |
non-temporal abstract entitycon |
Narrower Concepts |
sacrificial donorcon sacrificial acceptorcon |
URI | https://w3id.org/nfdi4cat/voc4cat_0000106 |
---|---|
Definition |
A molecule that accepts electrons from photoexcited species in a redox reaction and is subsequently consumed or degraded. |
Broader Concepts |
sacrificial reagantcon |
URI | https://w3id.org/nfdi4cat/voc4cat_0000107 |
---|---|
Definition |
A molecule that donates electrons from photoexcited species in a redox reaction and is subsequently consumed or degraded. |
Broader Concepts |
sacrificial reagantcon |
URI | https://w3id.org/nfdi4cat/voc4cat_0000108 |
---|---|
Definition |
Operation mode under the which the experiment takes place: batch of continuous flow mode. |
Broader Concepts |
attributescon |
Narrower Concepts |
batch operationcon flow operationcon |
URI | https://w3id.org/nfdi4cat/voc4cat_0000109 |
---|---|
Definition |
Under flow conditions, a continuous flow of reactants is supplied to the reaction chamber and the formed products are removed and identified by an appropriate technique. |
Broader Concepts |
operation modecon |
URI | https://w3id.org/nfdi4cat/voc4cat_0000110 |
---|---|
Definition |
Operation mode in which the reaction chamber is filled with the (reactant) gas(es) up to a certain pressure, and the reaction products accummulate over time. |
Broader Concepts |
operation modecon |
URI | https://w3id.org/nfdi4cat/voc4cat_0000111 |
---|---|
Definition |
The total duration of an experiment. |
Broader Concepts |
attributescon |
URI | https://w3id.org/nfdi4cat/voc4cat_0000112 |
---|---|
Definition |
Time for which a gas is purged through the reaction chamber. |
Broader Concepts |
attributescon |
URI | https://w3id.org/nfdi4cat/voc4cat_0000113 |
---|---|
Definition |
The time in between the collection of two data points. |
Broader Concepts |
attributescon |
URI | https://w3id.org/nfdi4cat/voc4cat_0000114 |
---|---|
Definition |
The total duration in which a catalyst is under irradiation by the selected light source. |
Broader Concepts |
attributescon |
URI | https://w3id.org/nfdi4cat/voc4cat_0000115 |
---|---|
Definition |
The temperature (range) under which the catalytic reaction takes place. |
Broader Concepts |
attributescon |
Narrower Concepts |
experiment initial temperaturecon experiment final temperaturecon |
URI | https://w3id.org/nfdi4cat/voc4cat_0000116 |
---|---|
Definition |
The temperature at the initiaton of the experiment. |
Broader Concepts |
experiment temperaturecon |
URI | https://w3id.org/nfdi4cat/voc4cat_0000117 |
---|---|
Definition |
The temperature at the end of the experiment. |
Broader Concepts |
experiment temperaturecon |
URI | https://w3id.org/nfdi4cat/voc4cat_0000118 |
---|---|
Definition |
The pressure (range) under which the catalytic reaction takes place. |
Broader Concepts |
attributescon |
Narrower Concepts |
experiment final pressurecon experiment initial pressurecon |
URI | https://w3id.org/nfdi4cat/voc4cat_0000119 |
---|---|
Definition |
The pressure at the initiaton of the experiment or before a sampling event. |
Broader Concepts |
experiment pressurecon |
URI | https://w3id.org/nfdi4cat/voc4cat_0000120 |
---|---|
Definition |
The pressure at the end of the experiment or after a sampling event. |
Broader Concepts |
experiment pressurecon |
URI | https://w3id.org/nfdi4cat/voc4cat_0000121 |
---|---|
Definition |
The pressure drop occurring when collecting a gaseous sample from the reaction chamber. This pressure drop should be taken into consideration when calculating the concentration of formed products. |
Broader Concepts |
attributescon |
URI | https://w3id.org/nfdi4cat/voc4cat_0000122 |
---|---|
Definition |
Pre-treatment of a catalyst before its introduction to the reaction chamber. |
Broader Concepts |
actionscon |
URI | https://w3id.org/nfdi4cat/voc4cat_0000123 |
---|---|
Definition |
Measurements performed to ensure that the studied catalytic reaction occurs because of the interaction of the catalyst with the reactants under the selected experimental conditions, and not from the environment or the reactor. |
Broader Concepts |
processescon |
URI | https://w3id.org/nfdi4cat/voc4cat_0000124 |
---|---|
Definition |
Quantitative and qualitative evaluation of the outcome of a catalytic reaction. The evaluation can lead to changes in the synthesis of the catalyst and / or selecting different experimental parameters. |
Broader Concepts |
actionscon |
URI | https://w3id.org/nfdi4cat/voc4cat_0000125 |
---|---|
Definition |
A dimensionless physical quantity describing how effective a reactant is converted to the desired product in a chemical conversion. It is calculated as the ratio between the amount of the desired product and the amount of the desired product that could have been formed if all reactants were converted to the desired product. The selectivity is 1 (or 100 %) if no other than the desired product is formed. |
Broader Concepts |
reactor performance measurecon catalyst performance measurecon chemical conversion performance measurecon |
URI | https://w3id.org/nfdi4cat/voc4cat_0000126 |
---|---|
Definition |
A measure of the efficiency of a photocatalytic reaction. It is expressed as the number of consumed charge carriers divided by the number of incident photons. |
Broader Concepts |
attributescon |
URI | https://w3id.org/nfdi4cat/voc4cat_0000127 |
---|---|
Definition |
The concentration (usually in ppm or mol) of the products formed during a reaction. |
Broader Concepts |
attributescon |
URI | https://w3id.org/nfdi4cat/voc4cat_0000128 |
---|---|
Definition |
Details describing the construction, physical dimensions, and operation of the photoreactor used to perform a photocatalytic reaction. |
Broader Concepts |
non-temporal abstract entitycon |
URI | https://w3id.org/nfdi4cat/voc4cat_0000129 |
---|---|
Definition |
Spectroscopic or chromatographic methods used to identify the products of the reaction qualitatively and quantitatively. Such devices are usually attached to the reactor, or a sample is being transferred to an identification method via another medium (e.g., gastight syringes). |
Broader Concepts |
attributescon |
URI | https://w3id.org/nfdi4cat/voc4cat_0000130 |
---|---|
Definition |
An analytical technique that separates and analyzes the components of a gas mixture by passing it though a stationary phase. |
Broader Concepts |
processescon |
URI | https://w3id.org/nfdi4cat/voc4cat_0000131 |
---|---|
Definition |
Detectors of the gas chromatogragh used to identify the reaction products and intemediates. |
Broader Concepts |
detectorcon |
URI | https://w3id.org/nfdi4cat/voc4cat_0000132 |
---|---|
Definition |
A type of gas chromatography detector that detects and quantifies the concentration of organic compounds in a gas sample emerging from a column, by measuring the electrical current generated by ionized gas constituents in a hydrogen flame. |
Broader Concepts |
detectorcon |
URI | https://w3id.org/nfdi4cat/voc4cat_0000133 |
---|---|
Definition |
A type of gas chromatography detector that measures the thermal conductivity of a gas sample and identifies its constituent molecules through changes in a filament’s temperature. |
Broader Concepts |
detectorcon |
URI | https://w3id.org/nfdi4cat/voc4cat_0000134 |
---|---|
Definition |
Detector incorporating Ionization via a new dielectric barrier discharge He plasma. |
Broader Concepts |
detectorcon |
URI | https://w3id.org/nfdi4cat/voc4cat_0000135 |
---|---|
Definition |
The minimum concentration of a product or intermediate that the gas chromatograph can identify. |
Broader Concepts |
attributescon |
URI | https://w3id.org/nfdi4cat/voc4cat_0000136 |
---|---|
Definition |
A process in which gaseous substances of known purity and concentration are introduced to the gas chromatograph and the respective area and retention time of the resulting peaks are identified. This process when concluded, allows for the calculation of concentrations of products and intermediates of the photoreaction. |
Broader Concepts |
actionscon |
URI | https://w3id.org/nfdi4cat/voc4cat_0000137 |
---|---|
Definition |
An analytical technique which determines the mass-to-charge ratio of ions in a sample to give information about the composition of the sample. |
Broader Concepts |
processescon |
URI | https://w3id.org/nfdi4cat/voc4cat_0000138 |
---|---|
Definition |
Detectors of the mass spectrometer used to identify the reaction products and intemediates. |
Broader Concepts |
detectorcon |
URI | https://w3id.org/nfdi4cat/voc4cat_0000139 |
---|---|
Definition |
The minimum concentration of a product or intermediate that the mass spectrometer can identify. |
Broader Concepts |
attributescon |
URI | https://w3id.org/nfdi4cat/voc4cat_0000140 |
---|---|
Definition |
A process in which gaseous substances of known purity and concentration are introduced to the mass spectrometer and the respective mass-to-charge ratios are identified. This process when concluded, allows for the calculation of concentrations of products and intermediates of the photoreaction. |
Broader Concepts |
actionscon |
URI | https://w3id.org/nfdi4cat/voc4cat_0000141 |
---|---|
Definition |
A sepation technique that uses a liquid mobile phase to separate the components of a mixture based on their interactions with a stationary phase and a mobile phase. |
Broader Concepts |
processescon |
URI | https://w3id.org/nfdi4cat/voc4cat_0000142 |
---|---|
Definition |
The range of parameters, critical for the safe operation of a reactor. |
Broader Concepts |
attributescon |
Narrower Concepts |
operation temperaturecon operation pressurecon |
URI | https://w3id.org/nfdi4cat/voc4cat_0000143 |
---|---|
Definition |
Maximum and minimum of operation pressure range within the reactor can operate safely. Higher operation temperatures can lead to higher pressure values. |
Broader Concepts |
operation parameterscon |
Narrower Concepts |
maximum operation pressurecon minimum operation pressurecon |
URI | https://w3id.org/nfdi4cat/voc4cat_0000144 |
---|---|
Definition |
Maximum of operation pressure range within the reactor can operate safely. |
Broader Concepts |
operation pressurecon |
URI | https://w3id.org/nfdi4cat/voc4cat_0000145 |
---|---|
Definition |
Minimum of operation pressure range within the reactor can operate safely. |
Broader Concepts |
operation pressurecon |
URI | https://w3id.org/nfdi4cat/voc4cat_0000146 |
---|---|
Definition |
Equipment (e.g., a vacuum pump) used for controlling and / or monitoring the pressure in various parts of a reactor. |
Broader Concepts |
equipmentcon |
Narrower Concepts |
vacuum pumpcon |
URI | https://w3id.org/nfdi4cat/voc4cat_0000147 |
---|---|
Definition |
Α mechanical device that removes gas molecules from a sealed chamber reaching pressures lower than the atmospheric pressure. |
Broader Concepts |
pressure controllercon |
URI | https://w3id.org/nfdi4cat/voc4cat_0000148 |
---|---|
Definition |
Maximum and minimum of operation temperature range within the reactor can operate safely. |
Broader Concepts |
operation parameterscon |
Narrower Concepts |
maximum operation temperaturecon minimum operation temperaturecon |
URI | https://w3id.org/nfdi4cat/voc4cat_0000149 |
---|---|
Definition |
Maximum of operation temperature range within the reactor can operate safely. |
Broader Concepts |
operation temperaturecon |
URI | https://w3id.org/nfdi4cat/voc4cat_0000150 |
---|---|
Definition |
Minimum of operation temperature range within the reactor can operate safely. |
Broader Concepts |
operation temperaturecon |
URI | https://w3id.org/nfdi4cat/voc4cat_0000151 |
---|---|
Definition |
Equipment used for controlling and/or monitoring the temperature in various parts of a reactor. This can include hot plates, heating elements and cryostats. |
Broader Concepts |
equipmentcon |
URI | https://w3id.org/nfdi4cat/voc4cat_0000152 |
---|---|
Definition |
A construction inside of which the catalyst and the reactants coexist, and the reaction takes place. |
Broader Concepts |
reactor equipmentcon |
URI | https://w3id.org/nfdi4cat/voc4cat_0000153 |
---|---|
Definition |
Volume of the reaction chamber, calculated by its dimensions. Volume of pipes and valves connected to the reaction chamber should also be calculated and added to the total volume. |
Broader Concepts |
attributescon |
URI | https://w3id.org/nfdi4cat/voc4cat_0000154 |
---|---|
Definition |
Height, width and depth (in cubic- or rectangular- shaped reaction chambers) or diameter and height (in cylindrer - shaped reaction chambers). |
Broader Concepts |
attributescon |
URI | https://w3id.org/nfdi4cat/voc4cat_0000155 |
---|---|
Definition |
The shape of the reaction chamber. In gas-phase reactions, reaction chambers have usually a cylindrical, cubical or rectangular shape. |
Broader Concepts |
attributescon |
URI | https://w3id.org/nfdi4cat/voc4cat_0000156 |
---|---|
Definition |
Material used for the construction of the main body of the reaction chamber. |
Broader Concepts |
attributescon |
URI | https://w3id.org/nfdi4cat/voc4cat_0000157 |
---|---|
Definition |
A transparent material optimized to allow the transmission of electromagnetic radiation with low reflectance and scattering. |
Broader Concepts |
optical equipmentcon |
URI | https://w3id.org/nfdi4cat/voc4cat_0000158 |
---|---|
Definition |
Material that the optical window is made of. The window, usually attached to the lid sealing the reaction chamber, allows the incoming light to interact with the catalyst. The material of the window influences the wavelength range that the catalyst experiences. |
Broader Concepts |
attributescon |
URI | https://w3id.org/nfdi4cat/voc4cat_0000159 |
---|---|
Definition |
The dimension of the optical window (diameter / thickness) allowing the incoming light to enter the reaction chamber and interact with the catalyst. |
Broader Concepts |
attributescon |
Narrower Concepts |
optical window thicknesscon optical window diametercon |
URI | https://w3id.org/nfdi4cat/voc4cat_0000160 |
---|---|
Definition |
Diameter of the optical window allowing the incoming light to enter the reaction chamber and interact with the catalyst. |
Broader Concepts |
optical window dimensionscon |
URI | https://w3id.org/nfdi4cat/voc4cat_0000161 |
---|---|
Definition |
Thickness of the optical window allowing the incoming light to enter the reaction chamber and interact with the catalyst. |
Broader Concepts |
optical window dimensionscon |
URI | https://w3id.org/nfdi4cat/voc4cat_0000162 |
---|---|
Definition |
Flow rates of gases used in an experiment. Gases can have either the role of a reactant (e.g., CO2) or be inert (e.g., Ar, He). |
Broader Concepts |
attributescon |
URI | https://w3id.org/nfdi4cat/voc4cat_0000163 |
---|---|
Definition |
Equipment used for controlling and / or monitoring the flow of gases (reactant or inert) needed for a catalytic experiment. Mass flow controllers (MFCs) are commonly used to control gas flows. |
Broader Concepts |
equipmentcon |
Narrower Concepts |
mass flow controllercon |
URI | https://w3id.org/nfdi4cat/voc4cat_0000164 |
---|---|
Definition |
A mass flow controller (MFC) is a device used to measure and control the flow of liquids and gases. A mass flow controller is designed and calibrated to control a specific type of liquid or gas at a particular range of flow rates. |
Broader Concepts |
gas flow controllercon |
URI | https://w3id.org/nfdi4cat/voc4cat_0000165 |
---|---|
Definition |
All the necessary equipment needed to perform a catalytic experiment involving irradiation. The system apart from the light source can include, filters, power units, lamp cooling devices etc.. |
Broader Concepts |
optical equipmentcon |
Narrower Concepts |
light sourcecon |
URI | https://w3id.org/nfdi4cat/voc4cat_0000166 |
---|---|
Definition |
Source used to irradiate a catalyst in a reaction chamber. These include sources with various intensities, power, and wavelength ranges, including Hg/Xe lamps, Xe lamps and LEDs. |
Broader Concepts |
irradiation systemcon |
Narrower Concepts |
light emitting diodecon mercury-xenon lampcon xenon lampcon |
URI | https://w3id.org/nfdi4cat/voc4cat_0000167 |
---|---|
Definition |
A lamp containing a mixture of mercury (Hg) and xenon (Xe) gases. Under electric current, the gas mixture gets ionized through a discharge electric charge creating a plasma generating UV and visible light. |
Broader Concepts |
light sourcecon |
URI | https://w3id.org/nfdi4cat/voc4cat_0000168 |
---|---|
Definition |
A lamp containing pure xenon (Xe) gas. Under electric current, the gas mixture gets ionized through a discharge electric charge creating a plasma generating UV and visible light. |
Broader Concepts |
light sourcecon |
URI | https://w3id.org/nfdi4cat/voc4cat_0000169 |
---|---|
Definition |
A solid-state semiconductor emitting light at highly controllable (narrow) wavelength ranges. |
Broader Concepts |
light sourcecon |
URI | https://w3id.org/nfdi4cat/voc4cat_0000170 |
---|---|
Definition |
Specific of properties of the light source dictating its operation and its adequacy in the studied catalytic reaction. |
Broader Concepts |
attributescon |
Narrower Concepts |
light source distancecon light operation currentcon light intensitycon light wavelengthcon light power outputcon light operation voltagecon |
URI | https://w3id.org/nfdi4cat/voc4cat_0000171 |
---|---|
Definition |
The distance of the light source from the reaction chamber and the catalyst. |
Broader Concepts |
light source propertycon |
URI | https://w3id.org/nfdi4cat/voc4cat_0000172 |
---|---|
Definition |
The value of current (usually in A or mA) used to operate the selected light source. |
Broader Concepts |
light source propertycon |
URI | https://w3id.org/nfdi4cat/voc4cat_0000173 |
---|---|
Definition |
The value of voltage (usually in V or mV) used to operate the selected light source. |
Broader Concepts |
light source propertycon |
URI | https://w3id.org/nfdi4cat/voc4cat_0000174 |
---|---|
Definition |
The power of the light source (usually in W or mW). The power can be calculated by the multiplication of the current and voltage used to operate the light source. |
Broader Concepts |
light source propertycon |
URI | https://w3id.org/nfdi4cat/voc4cat_0000175 |
---|---|
Definition |
The light intensity (usually in mW cm-2) of the selected light source. The light intensity should be measured at the same distance as the one between the light source and the reaction chamber / sample. |
Broader Concepts |
light source propertycon |
URI | https://w3id.org/nfdi4cat/voc4cat_0000176 |
---|---|
Definition |
The distance between two successive peaks or troughs in a wave. |
Broader Concepts |
light source propertycon |
URI | https://w3id.org/nfdi4cat/voc4cat_0000177 |
---|---|
Definition |
Electromagnetic radiation with wavelengths typically in the range of 800 nm - 20000 nm. |
Broader Concepts |
non-temporal abstract entitycon |
URI | https://w3id.org/nfdi4cat/voc4cat_0000178 |
---|---|
Definition |
Electromagnetic radiation with wavelengths visible to the human eye, typically in the range of 400-800 nm. |
Broader Concepts |
non-temporal abstract entitycon |
URI | https://w3id.org/nfdi4cat/voc4cat_0000179 |
---|---|
Definition |
Electromagnetic radiation with a wavelength typically in the range of 100-400 nanometers. |
Broader Concepts |
non-temporal abstract entitycon |
URI | https://w3id.org/nfdi4cat/voc4cat_0000180 |
---|---|
Definition |
Entity with a concrete and physical nature. |
Narrower Concepts |
personcon equipmentcon materialcon reactorcon |
URI | https://w3id.org/nfdi4cat/voc4cat_0000182 |
---|---|
Definition |
Anything that has a temporal dimension, whether it is an instantaneous point in time, a duration, or a sequence of events. |
Narrower Concepts |
actionscon spatio-temporal samplecon processescon eventscon |
URI | https://w3id.org/nfdi4cat/voc4cat_0000184 |
---|---|
Definition |
Temporal entities that have a duration and occur at specific points in time. |
Broader Concepts |
temporal abstract entitycon |
Narrower Concepts |
open circuit voltage measurementcon gas chromatograph calibrationcon sample pre-treatmentcon calcinationcon literature researchcon precipitationcon evaluationcon DFT calculationcon kinetic measurementcon purgingcon impregnationcon stability measurementcon mass spectrometer calibrationcon |
URI | https://w3id.org/nfdi4cat/voc4cat_0000187 |
---|---|
Definition |
Apparatus, devices, and instruments employed in the construction and operation of experimental setups and the analysis of catalytic reactions and materials. |
Broader Concepts |
physical entitycon |
Narrower Concepts |
electrochemical setupcon optical equipmentcon potentiostatcon electrolytecon membranecon electrodecon pressure controllercon temperature controllercon flow cellcon synthesis equipmentcon gas flow controllercon electrochemical cellcon beakercon H cellcon electrochemical equipmentcon microreactorcon reactor equipmentcon handbookcon sensorcon |
URI | https://w3id.org/nfdi4cat/voc4cat_0000188 |
---|---|
Definition |
Components being integral parts of a catalytic reactor. |
Broader Concepts |
equipmentcon |
Narrower Concepts |
reaction chambercon catalyst bedcon |
URI | https://w3id.org/nfdi4cat/voc4cat_0000189 |
---|---|
Definition |
Optical systems involved in light irradiation. |
Broader Concepts |
equipmentcon |
Narrower Concepts |
optical windowcon irradiation systemcon |
URI | https://w3id.org/nfdi4cat/voc4cat_0000190 |
---|---|
Definition |
Substances used as catalysts, supports, or reactants in catalytic processes. |
Broader Concepts |
physical entitycon |
Narrower Concepts |
nanoparticlecon polyoxometalatecon material samplecon synthesis gascon alloycon metal oxidecon porous materialcon semiconductorcon metal-organic frameworkcon catalystcon nanotubecon substratecon biomasscon |
URI | https://w3id.org/nfdi4cat/voc4cat_0000191 |
---|---|
Definition |
A device designed to identify a measurable change or signal in a system, often providing a binary (detected / not detected) or a qualitative response. |
Broader Concepts |
sensorcon |
Narrower Concepts |
gas chromatograph detectorcon dielectric-barrier discharge ionization detectorcon mass spectrometer detectorcon flame ionization detectorcon thermal conductivity detectorcon |
URI | https://w3id.org/nfdi4cat/voc4cat_0000192 |
---|---|
Definition |
A device that measures a specific physical or chemical property and converts it into readable signal, often for continuous monitoring. |
Broader Concepts |
equipmentcon |
Narrower Concepts |
detectorcon |
URI | https://w3id.org/nfdi4cat/voc4cat_0000193 |
---|---|
Definition |
A reactor used to perform and study electrochemical reactions. |
Broader Concepts |
reactorcon |
URI | https://w3id.org/nfdi4cat/voc4cat_0000194 |
---|---|
Definition |
A material that initiates or increases the rate of a catalytic reaction, without it being consumed in the process. |
Broader Concepts |
materialcon |
Narrower Concepts |
powdered catalystcon bulk catalystcon deposited samplecon photocatalystcon electrocatalystcon thin filmcon supported catalystcon heterogeneous catalystcon |
URI | https://w3id.org/nfdi4cat/voc4cat_0000196 |
---|---|
Definition |
An area of study, focusing in a specific sub-section of the general field of catalysis. |
Broader Concepts |
non-temporal abstract entitycon |
Narrower Concepts |
enzyme catalysiscon base catalysiscon asymmetric catalysiscon thermal catalysiscon homogeneous catalysiscon nanocatalysiscon organocatalysiscon photocatalysiscon catalysiscon electrocatalysiscon biocatalysiscon heterogeneous catalysiscon acid catalysiscon |
URI | https://w3id.org/nfdi4cat/voc4cat_0000197 |
---|---|
Definition |
Porous crystalline materials composed of metal nodes or clusters connected by organic linkers, forming highly ordered one-, two-, or three-dimensional structures with tunable properties. |
Broader Concepts |
materialcon |
URI | https://w3id.org/nfdi4cat/voc4cat_0000198 |
---|---|
Definition |
A porous solid material containing pores with width between 2 and 50 nm. |
Broader Concepts |
porous materialcon |
URI | https://w3id.org/nfdi4cat/voc4cat_0000199 |
---|---|
Definition |
A reaction mechanism is the step-by-step sequence of elementary reactions at the molecular level that explains how an overall chemical reaction proceeds. |
Broader Concepts |
non-temporal abstract entitycon |
URI | https://w3id.org/nfdi4cat/voc4cat_0000200 |
---|---|
Definition |
The science and technology of sustainable and environment friendly chemical processes and products that reduce or eliminate hazardous substances, while minimizing waste and energy consumption. |
Broader Concepts |
non-temporal abstract entitycon |
URI | https://w3id.org/nfdi4cat/voc4cat_0000201 |
---|---|
Definition |
A cross-coupling reaction is a catalytic, metal-mediated reaction that forms carbon-carbon or carbon-heteroatom bonds by joining two different molecular fragments, typically through the activation of electrophilic and nucleophilic partners. |
Broader Concepts |
non-temporal abstract entitycon |
URI | https://w3id.org/nfdi4cat/voc4cat_0000202 |
---|---|
Definition |
A type of organic reaction in which a stable carbon-hydrogen (C-H) bond is cleaved and replaced with a C-X bond. |
Broader Concepts |
processescon |
URI | https://w3id.org/nfdi4cat/voc4cat_0000203 |
---|---|
Definition |
A branch of chemistry studying chemical reactions and processes driven and affected by light and the absorption of photons. |
Broader Concepts |
non-temporal abstract entitycon |
URI | https://w3id.org/nfdi4cat/voc4cat_0000204 |
---|---|
Definition |
A catalytic process catalyzed by the presence of biological entities. |
Broader Concepts |
catalysis research fieldcon |
URI | https://w3id.org/nfdi4cat/voc4cat_0000205 |
---|---|
Definition |
Epoxidation is the chemical process of converting an alkene into an epoxide, a three-membered cyclic ether, by adding a single oxygen atom across a carbon-carbon double bond. |
Broader Concepts |
processescon |
URI | https://w3id.org/nfdi4cat/voc4cat_0000206 |
---|---|
Definition |
A chemical reaction in which water molecules are dissociated into gaseous hydrogen and oxygen, typically facilitted by catalysts and an external energy source. |
Broader Concepts |
processescon |
URI | https://w3id.org/nfdi4cat/voc4cat_0000207 |
---|---|
Definition |
A biocatalytic process performed in the presence of an enzyme. |
Broader Concepts |
catalysis research fieldcon |
URI | https://w3id.org/nfdi4cat/voc4cat_0000208 |
---|---|
Definition |
A type of catalysis where the rate of a chemical reaction is increased by the addition of a substoichiometric quantity of an organic (non-metallic) compound. |
Broader Concepts |
catalysis research fieldcon |
URI | https://w3id.org/nfdi4cat/voc4cat_0000209 |
---|---|
Definition |
A fuel cell is an electrochemical device that converts the chemical energy of a fuel, often hydrogen, and an oxidizing agent, typically oxygen, into electrical energy, with water and heat as the main byproducts. |
Broader Concepts |
electrochemical cellcon |
URI | https://w3id.org/nfdi4cat/voc4cat_0000210 |
---|---|
Definition |
A hollow cylindrical tube-like material structure at the nanoscale. |
Broader Concepts |
materialcon |
URI | https://w3id.org/nfdi4cat/voc4cat_0000211 |
---|---|
Definition |
The property of a chemical reaction to occur at a specific reactive site on a molecule, leading to the preferential formation of one regiosomer over others. |
Broader Concepts |
attributescon |
URI | https://w3id.org/nfdi4cat/voc4cat_0000212 |
---|---|
Definition |
is the preference of a chemical reaction to selectively react with one functional group in the presence of other reactive groups, leaving the latter unaffected. |
Broader Concepts |
attributescon |
URI | https://w3id.org/nfdi4cat/voc4cat_0000213 |
---|---|
Definition |
A one-, two-, or three-, dimensional structure that has at least one dimension in the nanometer scale. |
Broader Concepts |
attributescon |
URI | https://w3id.org/nfdi4cat/voc4cat_0000214 |
---|---|
Definition |
The ability of a chemical reaction to differentiate between enantiomers, leading to the preferential formation of one stereoisomer, often controlled by a chiral catalyst or reagent. |
Broader Concepts |
attributescon |
URI | https://w3id.org/nfdi4cat/voc4cat_0000215 |
---|---|
Definition |
A computational quantum mechanical modeling method used to investigate the electronic structure of atoms, molecules and solids, approximating their energy by using electron density as the key variable rather than wavefunctions. |
Broader Concepts |
non-temporal abstract entitycon |
URI | https://w3id.org/nfdi4cat/voc4cat_0000216 |
---|---|
Definition |
A catalytic process that facilitates reactions by controlling charge transfer at the electrode-electrolyte interface. |
Broader Concepts |
catalysis research fieldcon |
URI | https://w3id.org/nfdi4cat/voc4cat_0000217 |
---|---|
Definition |
Asymmetric catalysis is a catalytic process in which a chiral catalyst directs the formation of a chiral compound, preferentially producing one enantiomer over the other, thereby enhancing enantioselectivity in chemical reactions. |
Broader Concepts |
catalysis research fieldcon |
URI | https://w3id.org/nfdi4cat/voc4cat_0000218 |
---|---|
Definition |
The branch of chemistry that studies the relationship between electrical potential and chemical transformations, focusing on electron transfer processes, particularly redox reactions at electrode interfaces. |
Broader Concepts |
non-temporal abstract entitycon |
URI | https://w3id.org/nfdi4cat/voc4cat_0000219 |
---|---|
Definition |
A cyclic compound composed of at least one atom other than carbon in its ring structure. |
Broader Concepts |
non-temporal abstract entitycon |
URI | https://w3id.org/nfdi4cat/voc4cat_0000220 |
---|---|
Definition |
A chemical reaction in which an acyclic (open-chain) precursor molecule is transformed into a cyclic structure. |
Broader Concepts |
eventscon |
URI | https://w3id.org/nfdi4cat/voc4cat_0000221 |
---|---|
Definition |
The process of designing and modifying protein structures via genetic or chemical alterations to improve their stability, activity, specificity, and functionality. |
Broader Concepts |
processescon |
URI | https://w3id.org/nfdi4cat/voc4cat_0000222 |
---|---|
Definition |
A catalytic reaction for synthesizing an aldehyde from an alkene, by adding a formyl group (-CHO) and a hydrogen atom to a carbon-carbon double bond. |
Broader Concepts |
eventscon |
URI | https://w3id.org/nfdi4cat/voc4cat_0000223 |
---|---|
Definition |
A chemical reaction where a carbon-carbon bond is formed from two carbon-containing fragments. |
Broader Concepts |
eventscon |
URI | https://w3id.org/nfdi4cat/voc4cat_0000224 |
---|---|
Definition |
A chemical reaction where a silicon-hydrogen (Si-H) bond is added across an unsaturated bond typically catalyzed by a transition metal catalyst. |
Broader Concepts |
eventscon |
URI | https://w3id.org/nfdi4cat/voc4cat_0000225 |
---|---|
Definition |
A study of the correlation between the chemical structure of a molecule, its functional properties and its biological activity. |
Broader Concepts |
non-temporal abstract entitycon |
URI | https://w3id.org/nfdi4cat/voc4cat_0000226 |
---|---|
Definition |
A catalytic process in which oxygen is removed from oxygenated organic compounds using hydrogen. |
Broader Concepts |
eventscon |
URI | https://w3id.org/nfdi4cat/voc4cat_0000227 |
---|---|
Definition |
The process by which molecules or particles spontaneously organize into structured, well-defined functional systems, without external stimuli, but driven by local interactions. |
Broader Concepts |
processescon |
URI | https://w3id.org/nfdi4cat/voc4cat_0000228 |
---|---|
Definition |
The property of an asymmetric molecule that makes it non-superposable on its mirror image, resulting in enantiomers with distinct chemical or biological properties. |
Broader Concepts |
attributescon |
URI | https://w3id.org/nfdi4cat/voc4cat_0000229 |
---|---|
Definition |
A chemical species that contains at least one unpaired valence electron. |
Broader Concepts |
non-temporal abstract entitycon |
URI | https://w3id.org/nfdi4cat/voc4cat_0000230 |
---|---|
Definition |
A domino reaction is a chemical process of at least two consecutive sub-reactions occurring spontaneously in the same reaction vessel, without the need to add additional reagents, change reaction conditions and isolate intermediates. Each sub-reaction uses the product(s) already formed in the previous steps as reactant(s). |
Broader Concepts |
eventscon |
URI | https://w3id.org/nfdi4cat/voc4cat_0000231 |
---|---|
Definition |
A natural resource that can be ecologically or artificially replenished at a rate faster than consumed and over a reasonable period on the human time scale. |
Broader Concepts |
non-temporal abstract entitycon |
URI | https://w3id.org/nfdi4cat/voc4cat_0000232 |
---|---|
Definition |
A process in which an acid donates protons (protonation or electron withdrawal) or stabilizes reaction intermediates to accelerate a chemical reaction. |
Broader Concepts |
catalysis research fieldcon |
URI | https://w3id.org/nfdi4cat/voc4cat_0000233 |
---|---|
Definition |
A process in which base abstracts protons (deprotonation or electron donation) or stabilizes reaction intermediates to accelerate a chemical reaction. |
Broader Concepts |
catalysis research fieldcon |
URI | https://w3id.org/nfdi4cat/voc4cat_0000234 |
---|---|
Definition |
A small-scale chemical reactor, with lateral dimensions in the submillimeter range, typically employing microchannels to facilitate reactions within a well-controlled confined space. |
Broader Concepts |
equipmentcon |
URI | https://w3id.org/nfdi4cat/voc4cat_0000235 |
---|---|
Definition |
The interaction between at least two constituent parts (e.g., substances, processes, chemical species) to produce a combined effect greater than the sum of their individual effects, resulting in a more significant outcome than each part could achieve alone. |
Broader Concepts |
non-temporal abstract entitycon |
URI | https://w3id.org/nfdi4cat/voc4cat_0000236 |
---|---|
Definition |
A chemical reaction of generating molecular oxygen in electrochemistry. |
Broader Concepts |
eventscon |
URI | https://w3id.org/nfdi4cat/voc4cat_0000237 |
---|---|
Definition |
The reduction half reaction where oxygen is reduced to water or hydrogen peroxide. In electrochemistry it takes place in the cathode. |
Broader Concepts |
eventscon |
URI | https://w3id.org/nfdi4cat/voc4cat_0000238 |
---|---|
Definition |
A chemical processes occurring at surfaces and interfaces. |
Broader Concepts |
non-temporal abstract entitycon |
URI | https://w3id.org/nfdi4cat/voc4cat_0000239 |
---|---|
Definition |
A chemical synthesis process yielding stereoisomeric (enantiomeric or diastereomeric) products in different rations. |
Broader Concepts |
processescon |
URI | https://w3id.org/nfdi4cat/voc4cat_0000240 |
---|---|
Definition |
Molecules with the same formula and atomic connectivity, but with different spatial arrangement of atoms. |
Broader Concepts |
non-temporal abstract entitycon |
URI | https://w3id.org/nfdi4cat/voc4cat_0000241 |
---|---|
Definition |
A chemical reaction of generating molecular hydrogen in electrochemistry. |
Broader Concepts |
eventscon |
URI | https://w3id.org/nfdi4cat/voc4cat_0000242 |
---|---|
Definition |
The chemical reaction of adding an amino (-NH2) into a molecule to generate an amine. |
Broader Concepts |
eventscon |
URI | https://w3id.org/nfdi4cat/voc4cat_0000243 |
---|---|
Definition |
A chemical reaction where two or more unsaturated molecules unite to form a ring-shaped (cyclic) compound. |
Broader Concepts |
eventscon |
URI | https://w3id.org/nfdi4cat/voc4cat_0000244 |
---|---|
Definition |
A chemical reaction in which hydrogen (not directly from molecular hydrogen) is transferred to a molecule. |
Broader Concepts |
eventscon |
URI | https://w3id.org/nfdi4cat/voc4cat_0000245 |
---|---|
Definition |
A chemical reaction in which double bonds between atoms in two molecules are rearranged, yielding products formed by the exchange of molecular fragments between the reactants while keeping the number of double bonds the same. |
Broader Concepts |
eventscon |
URI | https://w3id.org/nfdi4cat/voc4cat_0000246 |
---|---|
Definition |
The application of materials with dimensions in the nanoscale, to catalyze chemical reactions. |
Broader Concepts |
catalysis research fieldcon |
URI | https://w3id.org/nfdi4cat/voc4cat_0000247 |
---|---|
Definition |
A chemical reaction in which a carbonyl group (C=O) is introduced into a molecule, typically through the addition of carbon monoxide (CO) to a substrate. |
Broader Concepts |
eventscon |
URI | https://w3id.org/nfdi4cat/voc4cat_0000248 |
---|---|
Definition |
The modification of chemical compounds by biological entities (e.g., enzymes) to yield more biologically active products. |
Broader Concepts |
processescon |
URI | https://w3id.org/nfdi4cat/voc4cat_0000249 |
---|---|
Definition |
A process of separating two enantiomers of a chiral compound in a racemic mixture based on their different reaction rates in a chemical reaction. |
Broader Concepts |
processescon |
URI | https://w3id.org/nfdi4cat/voc4cat_0000250 |
---|---|
Definition |
The reaction in which water is converted (usually electrochemically or photocatalytically) into oxygen and protons. |
Broader Concepts |
processescon |
URI | https://w3id.org/nfdi4cat/voc4cat_0000251 |
---|---|
Definition |
A synthesis process where three or more compounds react in the same reactor (one-pot reaction) to form a structurally complex single product that incorporates most of the atoms of the starting compounds. |
Broader Concepts |
processescon |
URI | https://w3id.org/nfdi4cat/voc4cat_0000252 |
---|---|
Definition |
A chemical reaction in which one or more aryl groups are added into a molecule, commonly facilitated by a catalyst. |
Broader Concepts |
eventscon |
URI | https://w3id.org/nfdi4cat/voc4cat_0000253 |
---|---|
Definition |
A chemical reaction which involves the cleavage of a chemical bond in the presence of hydrogen, often performed catalytically. |
Broader Concepts |
eventscon |
URI | https://w3id.org/nfdi4cat/voc4cat_0000254 |
---|---|
Definition |
A material which directs and accelerates an electrochemical reaction while remaining unchanged in the process. |
Broader Concepts |
catalystcon |
URI | https://w3id.org/nfdi4cat/voc4cat_0000255 |
---|---|
Definition |
The characteristics of a material or substance that determine how it interacts or responds to a magnetic field. |
Broader Concepts |
non-temporal abstract entitycon |
URI | https://w3id.org/nfdi4cat/voc4cat_0000256 |
---|---|
Definition |
A process that utilizes physical, chemical, or biological processes to turn organic substances, like plant material and animal waste, into high-value products and energy forms (e.g., biofuels). |
Broader Concepts |
processescon |
URI | https://w3id.org/nfdi4cat/voc4cat_0000257 |
---|---|
Definition |
The effects a solvent exerts on chemical reactions and molecular properties. |
Broader Concepts |
non-temporal abstract entitycon |
URI | https://w3id.org/nfdi4cat/voc4cat_0000258 |
---|---|
Definition |
The addition of a hydroxyl group (-OH) to a molecule, typically by replacing a hydrogen atom. |
Broader Concepts |
eventscon |
URI | https://w3id.org/nfdi4cat/voc4cat_0000259 |
---|---|
Definition |
The reaction of carbon dioxide (CO2) with molecular hydrogen (H2) to produce value-added hydrocarbons or alcohols. |
Broader Concepts |
eventscon |
URI | https://w3id.org/nfdi4cat/voc4cat_0000260 |
---|---|
Definition |
A chemical reaction of molecular hydrogen (H2) and another chemical species, typically facilitated by a catalyst. |
Broader Concepts |
eventscon |
URI | https://w3id.org/nfdi4cat/voc4cat_0000261 |
---|---|
Definition |
The targeted oxidation of a specific bond or functional group in a molecule leaving other sites unaffected, often directed by a catalyst. |
Broader Concepts |
eventscon |
URI | https://w3id.org/nfdi4cat/voc4cat_0000262 |
---|---|
Definition |
The typically catalyzed reduction of carbonyl groups to form primary and secondary amines, through an imine intermediate. |
Broader Concepts |
processescon |
URI | https://w3id.org/nfdi4cat/voc4cat_0000263 |
---|---|
Definition |
The tendency of a reaction to yield one stereoisomer preferentially over another. |
Broader Concepts |
non-temporal abstract entitycon |
URI | https://w3id.org/nfdi4cat/voc4cat_0000264 |
---|---|
Definition |
A field of chemistry focused in solving chemical problems through the use of mathematical modelling, chemical theory and computational techniques. |
Broader Concepts |
non-temporal abstract entitycon |
URI | https://w3id.org/nfdi4cat/voc4cat_0000265 |
---|---|
Definition |
The application of analytical techniques (e.g., spectroscopy and microscopy) to examine the composition, structure, and properties of surfaces. |
Broader Concepts |
processescon |
URI | https://w3id.org/nfdi4cat/voc4cat_0000266 |
---|---|
Definition |
A process of accelerating natural evolution of biological molecules (e.g., proteins, enzymes, nucleic acids) and systems by random mutagenesis and selective screening leading to tailored properties and functionality. |
Broader Concepts |
processescon |
URI | https://w3id.org/nfdi4cat/voc4cat_0000267 |
---|---|
Definition |
A single catalyst, integrating two distinct active sites with complementary functionalities, that participate synergistically in a chemical reaction. |
Broader Concepts |
non-temporal abstract entitycon |
URI | https://w3id.org/nfdi4cat/voc4cat_0000268 |
---|---|
Definition |
A gas mixture comprised primarily of hydrogen (H2) and carbon monoxide (CO) in various ratios. |
Broader Concepts |
materialcon |
URI | https://w3id.org/nfdi4cat/voc4cat_0000269 |
---|---|
Definition |
A chemical reaction that is performed in a continuous flow stream of reagents. |
Broader Concepts |
processescon |
URI | https://w3id.org/nfdi4cat/voc4cat_0000270 |
---|---|
Definition |
A solid substance featuring pores, the size, arrangement and shape of which govern the material’s permeability, adsorption properties, and mechanical properties. |
Broader Concepts |
materialcon |
Narrower Concepts |
mesoporous materialcon macroporous materialcon microporous materialcon |
URI | https://w3id.org/nfdi4cat/voc4cat_0000271 |
---|---|
Definition |
A porous solid material containing pores with width smaller than 2nm. |
Broader Concepts |
porous materialcon |
URI | https://w3id.org/nfdi4cat/voc4cat_0000272 |
---|---|
Definition |
A porous solid material containing pores with width larger than 50nm |
Broader Concepts |
porous materialcon |
URI | https://w3id.org/nfdi4cat/voc4cat_0000273 |
---|---|
Definition |
A technique of synthesizing substances from high-temperature and high-pressure aqueous solutions, typically performed in a sealed vessel. |
Broader Concepts |
processescon |
URI | https://w3id.org/nfdi4cat/voc4cat_0000274 |
---|---|
Definition |
The ability of a chemical action to differentiate between diastereoisomers, leading to the preferential formation of one diastereoisomers over another. |
Broader Concepts |
non-temporal abstract entitycon |
URI | https://w3id.org/nfdi4cat/voc4cat_0000275 |
---|---|
Definition |
The study of water’s properties and its interactions with other substances in chemical reactions. |
Broader Concepts |
non-temporal abstract entitycon |
URI | https://w3id.org/nfdi4cat/voc4cat_0000276 |
---|---|
Definition |
A carbon-carbon bond-forming reaction between the carbonyl groups of two compounds (typically aldehydes or ketones). A carbonyl group of one compound and the α-position of another carbonyl molecule react to form a β-hydroxycarbonyl compound. |
Broader Concepts |
eventscon |
URI | https://w3id.org/nfdi4cat/voc4cat_0000277 |
---|---|
Definition |
The process of introducing new functional groups by cleaving and modifying a carbon-hydrogen (C-H) bond into C-X (X=heteroatom or functional group). |
Broader Concepts |
non-temporal abstract entitycon |
URI | https://w3id.org/nfdi4cat/voc4cat_0000278 |
---|---|
Definition |
A C-C (or C-X) bond forming reaction in which a nucleophile (typically an enolate), reacts with an α,β-unsaturated carbonyl compound. |
Broader Concepts |
eventscon |
URI | https://w3id.org/nfdi4cat/voc4cat_0000279 |
---|---|
Definition |
A type of a structural point defect in a crystal lattice where an oxygen atom is missing from its expected position. |
Broader Concepts |
non-temporal abstract entitycon |
URI | https://w3id.org/nfdi4cat/voc4cat_0000280 |
---|---|
Definition |
A catalytic chemical reaction in which a mixture of carbon monoxide (CO) and hydrogen (H2), is converted via a chain-growth mechanism into long-chain hydrocarbons (e.g., alkanes, alkenes or alcohols)—typically using iron or cobalt catalysts under moderate to high pressures and temperatures. |
Broader Concepts |
eventscon |
URI | https://w3id.org/nfdi4cat/voc4cat_0000281 |
---|---|
Definition |
The industrial implementation of Fischer–Tropsch synthesis, encompassing in addition the associated engineering, reactor design, feedstock preparation, heat management, and product upgrading steps required for large-scale operation. |
Broader Concepts |
processescon |
URI | https://w3id.org/nfdi4cat/voc4cat_0000282 |
---|---|
Definition |
The application of density functional theory (DFT) to compute the electonic structure of atoms, molecules and solids. |
Broader Concepts |
actionscon |
URI | https://w3id.org/nfdi4cat/voc4cat_0000283 |
---|---|
Definition |
The relocation of an electron from one donor chemical species (atom, ion, or molecule) to another chemical entity (acceptor) changing their oxidation states in the process. |
Broader Concepts |
eventscon |
URI | https://w3id.org/nfdi4cat/voc4cat_0000284 |
---|---|
Definition |
A ring-shaped compound that contains at least one nitrogen atom as part of its cyclic structure along with carbon atoms. |
Broader Concepts |
non-temporal abstract entitycon |
URI | https://w3id.org/nfdi4cat/voc4cat_0000285 |
---|---|
Definition |
The chemical or enzymatic incorporation of carbon dioxide into organic compounds (typically carbohydrates). |
Broader Concepts |
processescon |
URI | https://w3id.org/nfdi4cat/voc4cat_0000286 |
---|---|
Definition |
An element- and orbital- specific analytical technique that probes the energy-dependent absorption of X-rays from synchrotron radiation, to study the electronic and geometric properties of materials. |
Broader Concepts |
characterization techniquecon |
URI | https://w3id.org/nfdi4cat/voc4cat_0000287 |
---|---|
Definition |
An ion or molecule that binds to a central atom through electron pair donation, to form a coordination complex compound. |
Broader Concepts |
non-temporal abstract entitycon |
URI | https://w3id.org/nfdi4cat/voc4cat_0000288 |
---|---|
Definition |
A microscopy technique that uses an electron beam as a source of sample illumination. |
Broader Concepts |
characterization techniquecon |
URI | https://w3id.org/nfdi4cat/voc4cat_0000289 |
---|---|
Definition |
The reaction in which carbon monoxide (CO) is converted to carbon dioxide (CO₂) through interaction with an oxidizing agent, typically oxygen (O₂). |
Broader Concepts |
eventscon |
URI | https://w3id.org/nfdi4cat/voc4cat_0000290 |
---|---|
Definition |
The chemical reaction in which carbon dioxide (CO₂) is converted into value-added chemicals or fuels through electron and proton transfer, typically facilitated by a catalyst under electrochemical, photochemical, or thermochemical conditions. |
Broader Concepts |
eventscon |
URI | https://w3id.org/nfdi4cat/voc4cat_0000291 |
---|---|
Definition |
The generation of molecular hydrogen (H2) through chemical transformations. |
Broader Concepts |
processescon |
URI | https://w3id.org/nfdi4cat/voc4cat_0000292 |
---|---|
Definition |
An industrial term that covers the Fischer-Tropsch process and all the systems, equipment, and engineering methods used to apply it at commercial scale. This includes reactors, control systems, and plant designs used to produce synthetic fuels using the Fischer-Tropsch synthesis. |
Broader Concepts |
non-temporal abstract entitycon |
URI | https://w3id.org/nfdi4cat/voc4cat_0000293 |
---|---|
Definition |
A particle with dimensions in the nanoscale range. |
Broader Concepts |
materialcon |
URI | https://w3id.org/nfdi4cat/voc4cat_0000294 |
---|---|
Definition |
A catalytic process where the catalytic species is present in the same physical phase as the reactants, typically in a sinlge liquid phase. |
Broader Concepts |
catalysis research fieldcon |
URI | https://w3id.org/nfdi4cat/voc4cat_0000295 |
---|---|
Definition |
Organic mass of biological origin. |
Broader Concepts |
materialcon |
URI | https://w3id.org/nfdi4cat/voc4cat_0000296 |
---|---|
Definition |
Acceleration of a chemical reaction induced by the presence of material that is chemically unchanged at the end of the reaction. |
Broader Concepts |
catalysis research fieldcon |
URI | https://w3id.org/nfdi4cat/voc4cat_0000297 |
---|---|
Definition |
A chemical reaction that involves the removal of two or more hydrogen atoms from a molecule. |
Broader Concepts |
eventscon |
URI | https://w3id.org/nfdi4cat/voc4cat_0000298 |
---|---|
Definition |
The study and characterization of the temporal progression of physical and (bio-)chemical processes, with particular emphasis on the rates and mechanisms by which chemical transformations occur. |
Broader Concepts |
non-temporal abstract entitycon |
URI | https://w3id.org/nfdi4cat/voc4cat_0000299 |
---|---|
Definition |
Measure of the acidic strength of a solution. |
Broader Concepts |
attributescon |
URI | https://w3id.org/nfdi4cat/voc4cat_0000300 |
---|---|
Definition |
Mixture of metals with certain (often improved) mechanical, chemical, electrical, magnetic or other properties. |
Broader Concepts |
materialcon |
URI | https://w3id.org/nfdi4cat/voc4cat_0000301 |
---|---|
Definition |
A Lewis acid is a molecular entity that functions as an electron-pair acceptor, forming a coordinate covalent bond with a Lewis base through interaction with its lone electron pair. |
Broader Concepts |
non-temporal abstract entitycon |
URI | https://w3id.org/nfdi4cat/voc4cat_0000302 |
---|---|
Definition |
A chemical reaction in which the main product is an isomer of the main reactant, entailing a change in molecular structure without altering the overall molecular composition. |
Broader Concepts |
eventscon |
URI | https://w3id.org/nfdi4cat/voc4cat_0000303 |
---|---|
Definition |
A chemical reaction where one or more alkyl groups is introduced into a molecular structure via covalent bond formation. |
Broader Concepts |
eventscon |
URI | https://w3id.org/nfdi4cat/voc4cat_0000304 |
---|---|
Definition |
A process in which low molecular weight monomers (of the same or different kind) are combined forming a long-chain or three-dimensional, high molecular weight polymer molecule. |
Broader Concepts |
processescon |
URI | https://w3id.org/nfdi4cat/voc4cat_0000305 |
---|---|
Definition |
The quality of being free from change or variation or not taking part in chemical change. |
Broader Concepts |
attributescon |
URI | https://w3id.org/nfdi4cat/voc4cat_0000306 |
---|---|
Definition |
A solvolysis reaction where the solvent material is water. |
Broader Concepts |
eventscon |
URI | https://w3id.org/nfdi4cat/voc4cat_0000307 |
---|---|
Definition |
An anionic metal-oxygen cluster composed of early transition metals in high oxidation states, interconnected by shared oxygen atoms to form a closed 3-dimensional framework. |
Broader Concepts |
materialcon |
URI | https://w3id.org/nfdi4cat/voc4cat_0000308 |
---|---|
Definition |
Measure of the basic strength from OH- ions of a solution. |
Broader Concepts |
attributescon |
URI | https://w3id.org/nfdi4cat/voc4cat_0000309 |
---|---|
Definition |
A chemical element in the d-block of the periodic table with a partially filled d-orbital. |
Broader Concepts |
non-temporal abstract entitycon |
URI | https://w3id.org/nfdi4cat/voc4cat_0005001 |
---|---|
Definition |
A measure to quantify how fast and selective a chemical conversion occurs in a reactor. A chemical conversion may include multiple reactions. |
Broader Concepts |
attributescon |
Narrower Concepts |
selectivitycon space-time yieldcon yieldcon conversioncon |
URI | https://w3id.org/nfdi4cat/voc4cat_0005002 |
---|---|
Definition |
A measure to quantify how fast and selective a chemical conversion occurs. A chemical conversion may include multiple reactions. |
Broader Concepts |
attributescon |
Narrower Concepts |
conversioncon selectivitycon space-time yieldcon yieldcon |
URI | https://w3id.org/nfdi4cat/voc4cat_0005003 |
---|---|
Definition |
A measure to quantify how fast and selective a chemical conversion occurs over in presence of a catalyst. A chemical conversion may include multiple reactions. |
Broader Concepts |
attributescon |
Narrower Concepts |
selectivitycon space-time yieldcon yieldcon conversioncon |
URI | https://w3id.org/nfdi4cat/voc4cat_0005004 |
---|---|
Definition |
A dimensionless physical quantity describing the fraction of a reactant that reacts in a chemical conversion. If a reactant is consumed completely its conversion is 1 (or 100 %). |
Broader Concepts |
chemical conversion performance measurecon reactor performance measurecon catalyst performance measurecon |
URI | https://w3id.org/nfdi4cat/voc4cat_0005005 |
---|---|
Definition |
A dimensionless physical quantity describing the fraction of a product B that is formed from a reactant A taking into account the stoichiometry. If A fully reacts to B without side-reactions, the yield of product B is 1 (or 100 %). |
Broader Concepts |
chemical conversion performance measurecon reactor performance measurecon catalyst performance measurecon |
URI | https://w3id.org/nfdi4cat/voc4cat_0005006 |
---|---|
Definition |
A physical quantity that describes the amount of product produced per unit of time and unit of producing entity. The producing entity is for example the volume of a chemical reactor or in catalysis the mass or volume or moles of catalyst. Example unit: kg{product} / (hour * cubicmeter{catalyst}) |
Broader Concepts |
catalyst performance measurecon chemical conversion performance measurecon reactor performance measurecon |
URI | https://w3id.org/nfdi4cat/voc4cat_0005007 |
---|---|
Definition |
Describes a transformation that changes the chemical composition of involved materials. |
Broader Concepts |
attributescon |
URI | https://w3id.org/nfdi4cat/voc4cat_0005008 |
---|---|
Definition |
A quantity describing the progress of a chemical reaction. For any chemical entitiy taking part in the reaction it is defined by the amount of chemical entity formed devided by its stoichiometric number in the reaction. |
Broader Concepts |
attributescon |
URI | https://w3id.org/nfdi4cat/voc4cat_0005009 |
---|---|
Definition |
Is a quantity describing how fast a product is formed in a chemical reaction. It is defined by the amount of product formed per unit of time. |
Broader Concepts |
attributescon |
URI | https://w3id.org/nfdi4cat/voc4cat_0005010 |
---|---|
Definition |
Is a quantity describing how fast a reactant is consumed in a chemical reaction. It is defined by the amount of reactant consumed per unit of time. |
Broader Concepts |
attributescon |
URI | https://w3id.org/nfdi4cat/voc4cat_0005011 |
---|---|
Definition |
A collection of the resource categories used in pid4cat. Resource categories classify for which type of resource the PID is used, e.g. if the PID is for a sample or a device. |
Broader Concepts |
non-temporal abstract entitycon |
Narrower Concepts |
samplecon data objectcon collectioncon devicecon data servicecon materialcon |
URI | https://w3id.org/nfdi4cat/voc4cat_0005012 |
---|---|
Definition |
A PID resource category for a collection, which is a group of resources and/or other collections. |
Broader Concepts |
PID resource categoriescon |
URI | https://w3id.org/nfdi4cat/voc4cat_0005013 |
---|---|
Definition |
A PID resource category for a material sample (voc4cat:0005056). |
Broader Concepts |
PID resource categoriescon |
URI | https://w3id.org/nfdi4cat/voc4cat_0005014 |
---|---|
Definition |
A PID resource category for a material used in the research process. Note that in the PID resource categorization, a "material" is distinct from "sample" (voc4cat:0005013) and distinct from "device" (voc4cat:0005015) . |
Broader Concepts |
PID resource categoriescon |
URI | https://w3id.org/nfdi4cat/voc4cat_0005015 |
---|---|
Definition |
A PID resource category for a physical device used in a research or manufacturing process. |
Broader Concepts |
PID resource categoriescon |
URI | https://w3id.org/nfdi4cat/voc4cat_0005016 |
---|---|
Definition |
A PID resource category for a collection of data available for access or download. A data object might be a data file, a data set, a data collection. |
Broader Concepts |
PID resource categoriescon |
URI | https://w3id.org/nfdi4cat/voc4cat_0005017 |
---|---|
Definition |
A PID resource category for a data service, which is an organized system of operations that provide data processing functions or access to datasets. |
Broader Concepts |
PID resource categoriescon |
URI | https://w3id.org/nfdi4cat/voc4cat_0005018 |
---|---|
Definition |
The type of relation between two resources. These relations are for example used to express relations between resources identified by their persistent identifiers. |
Broader Concepts |
non-temporal abstract entitycon |
Narrower Concepts |
is previous version ofcon is collected bycon is new version ofcon has metadatacon is supplement tocon documentscon is variant form ofcon is published incon is identical tocon is cited bycon is derived fromcon has partcon is continued bycon has versioncon continuescon citescon referencescon obsoletescon is compiled bycon is required bycon is part ofcon requirescon conforms tocon is metadata forcon is documented bycon collectscon is original form ofcon is referenced bycon is supplemented bycon is version ofcon is source ofcon compilescon is obsoleted bycon |
URI | https://w3id.org/nfdi4cat/voc4cat_0005019 |
---|---|
Definition |
The resource is cited by another resource. |
Broader Concepts |
resource relationcon |
URI | https://w3id.org/nfdi4cat/voc4cat_0005020 |
---|---|
Definition |
The resource cites another resource. |
Broader Concepts |
resource relationcon |
URI | https://w3id.org/nfdi4cat/voc4cat_0005021 |
---|---|
Definition |
The resource is supplemented by another resource. |
Broader Concepts |
resource relationcon |
URI | https://w3id.org/nfdi4cat/voc4cat_0005022 |
---|---|
Definition |
The resource supplements another resource. |
Broader Concepts |
resource relationcon |
URI | https://w3id.org/nfdi4cat/voc4cat_0005023 |
---|---|
Definition |
The resource is continued by another resource. |
Broader Concepts |
resource relationcon |
URI | https://w3id.org/nfdi4cat/voc4cat_0005024 |
---|---|
Definition |
The resource continues another resource. |
Broader Concepts |
resource relationcon |
URI | https://w3id.org/nfdi4cat/voc4cat_0005025 |
---|---|
Definition |
The resource has metadata in another resource. |
Broader Concepts |
resource relationcon |
URI | https://w3id.org/nfdi4cat/voc4cat_0005026 |
---|---|
Definition |
The resource is metadata for another resource. |
Broader Concepts |
resource relationcon |
URI | https://w3id.org/nfdi4cat/voc4cat_0005027 |
---|---|
Definition |
The resource has a version. This is useful to refer to different versions of an abstract resource, for example, "Python has version Python 3.12.4". |
Broader Concepts |
resource relationcon |
URI | https://w3id.org/nfdi4cat/voc4cat_0005028 |
---|---|
Definition |
The resource is a version of another resource. This is useful to refer to an abstract resource that has different versions, for example, "Python 3.12.4 is version of Python". |
Broader Concepts |
resource relationcon |
URI | https://w3id.org/nfdi4cat/voc4cat_0005029 |
---|---|
Definition |
The resource is a new version of another versioned resource. This is useful to refer between versioned resources, for example, "Python 3.12.1 is_new_version_of Python 3.12.0". |
Broader Concepts |
resource relationcon |
URI | https://w3id.org/nfdi4cat/voc4cat_0005030 |
---|---|
Definition |
The resource is a previous version of another versioned resource. This is useful to refer between versioned resources, for example, "Python 3.12.0 is_previous_version_of Python 3.12.1". |
Broader Concepts |
resource relationcon |
URI | https://w3id.org/nfdi4cat/voc4cat_0005031 |
---|---|
Definition |
The resource is part of another resource. This relation applies to container-contained type relationships. If the relation refers to publishing one resource as part of another resource, use "IS_PUBLISHED_IN" instead. If the relation refers to a versioned resource and non-versioned resource, use "IS_VERSION_OF" instead. |
Broader Concepts |
resource relationcon |
URI | https://w3id.org/nfdi4cat/voc4cat_0005032 |
---|---|
Definition |
The resource has part another resource. This relation applies to container-contained type relationships. If the relation refers to publishing one resource as part of another resource, "IS_PUBLISHED_IN" instead. If the relation refers to a versioned resource and non-versioned resource, use "HAS_VERSION" instead. |
Broader Concepts |
resource relationcon |
URI | https://w3id.org/nfdi4cat/voc4cat_0005033 |
---|---|
Definition |
The resource is published in another resource. A resource A that is_published_in a resource B is independent from other resources published in the same resource B. |
Broader Concepts |
resource relationcon |
URI | https://w3id.org/nfdi4cat/voc4cat_0005034 |
---|---|
Definition |
The resource is referenced by another resource. |
Broader Concepts |
resource relationcon |
URI | https://w3id.org/nfdi4cat/voc4cat_0005035 |
---|---|
Definition |
The resource references another resource. |
Broader Concepts |
resource relationcon |
URI | https://w3id.org/nfdi4cat/voc4cat_0005036 |
---|---|
Definition |
The resource is documented by another resource. |
Broader Concepts |
resource relationcon |
URI | https://w3id.org/nfdi4cat/voc4cat_0005037 |
---|---|
Definition |
The resource documents another resource. |
Broader Concepts |
resource relationcon |
URI | https://w3id.org/nfdi4cat/voc4cat_0005038 |
---|---|
Definition |
The resource is compiled by another resource. Resources may be text or software. The compiler may be a computer program or a person. |
Broader Concepts |
resource relationcon |
URI | https://w3id.org/nfdi4cat/voc4cat_0005039 |
---|---|
Definition |
The resource compiles another resource. Resources may be text or software. The compiler may be a computer program or a person. |
Broader Concepts |
resource relationcon |
URI | https://w3id.org/nfdi4cat/voc4cat_0005040 |
---|---|
Definition |
The resource is variant form of another resource. This may be used e.g. for relating architecture-specific builds of a software program to a source-code release. It may also be used to express the relation between data in different formats (e.g. PNG, JPEG) of the same image. |
Broader Concepts |
resource relationcon |
URI | https://w3id.org/nfdi4cat/voc4cat_0005041 |
---|---|
Definition |
The resource is original form of another resource. This may be used e.g. for relating architecture-specific builds of a software program to a source-code release. It may also be used to express the relation between data in different formats (e.g. PNG, JPEG) of the same image. |
Broader Concepts |
resource relationcon |
URI | https://w3id.org/nfdi4cat/voc4cat_0005042 |
---|---|
Definition |
The resource is identical to another resource. May be used to indicate the relationship between an exact copy of a resource that is published at another location. |
Broader Concepts |
resource relationcon |
URI | https://w3id.org/nfdi4cat/voc4cat_0005043 |
---|---|
Definition |
The resource is derived from another resource. This may be used for relating a new dataset created by data processing to its original source dataset. For samples it may express the relation between the original sample and another sample derived from it by physical or chemical treatment. |
Broader Concepts |
resource relationcon |
URI | https://w3id.org/nfdi4cat/voc4cat_0005044 |
---|---|
Definition |
The resource is source of another resource. This may be used for example to express the relation between a source dataset and a new dataset derived from it by data processing. For samples it may express the relation between a sample processed by physical or chemical treatment and the original sample. |
Broader Concepts |
resource relationcon |
URI | https://w3id.org/nfdi4cat/voc4cat_0005045 |
---|---|
Definition |
The resource is collected by another resource. May be used to indicate the relationship between a dataset and an instrument that is used to collect, measure, obtain, or observe data. |
Broader Concepts |
resource relationcon |
URI | https://w3id.org/nfdi4cat/voc4cat_0005046 |
---|---|
Definition |
The resource collects another resource. May be used to indicate the relationship between an instrument and where it has been used to collect, measure, obtain, or observe data. |
Broader Concepts |
resource relationcon |
URI | https://w3id.org/nfdi4cat/voc4cat_0005047 |
---|---|
Definition |
The resource is required by another resource. |
Broader Concepts |
resource relationcon |
URI | https://w3id.org/nfdi4cat/voc4cat_0005048 |
---|---|
Definition |
The resource requires another resource. |
Broader Concepts |
resource relationcon |
URI | https://w3id.org/nfdi4cat/voc4cat_0005049 |
---|---|
Definition |
The resource is obsoleted by another resource. |
Broader Concepts |
resource relationcon |
URI | https://w3id.org/nfdi4cat/voc4cat_0005050 |
---|---|
Definition |
The resource obsoletes another resource. |
Broader Concepts |
resource relationcon |
URI | https://w3id.org/nfdi4cat/voc4cat_0005051 |
---|---|
Definition |
A usage status of a pid4cat persistent identifier (PID). |
Broader Concepts |
non-temporal abstract entitycon |
Narrower Concepts |
registeredcon submittedcon deprecatedcon obsoletedcon |
URI | https://w3id.org/nfdi4cat/voc4cat_0005052 |
---|---|
Definition |
The persistent identifier is reserved but the resource is not yet linked. |
Broader Concepts |
pid4cat statuscon |
URI | https://w3id.org/nfdi4cat/voc4cat_0005053 |
---|---|
Definition |
The persistent identifier is linked to a concrete resource. |
Broader Concepts |
pid4cat statuscon |
URI | https://w3id.org/nfdi4cat/voc4cat_0005054 |
---|---|
Definition |
The persistent identifier is obsolete, e.g. because the resource is referenced by another persistent identifier. |
Broader Concepts |
pid4cat statuscon |
URI | https://w3id.org/nfdi4cat/voc4cat_0005055 |
---|---|
Definition |
The persistent identifier is deprecated, e.g. because the resource can no longer be found. |
Broader Concepts |
pid4cat statuscon |
URI | https://w3id.org/nfdi4cat/voc4cat_0005056 |
---|---|
Definition |
A representative part of a material of interest on which observations are made. |
Broader Concepts |
materialcon |
Broad Matches |
https://www.w3.org/ns/sosa/Samplecon |
URI | https://w3id.org/nfdi4cat/voc4cat_0005057 |
---|---|
Definition |
A representative part of an entity of interest on which observations are made and which is created by time-based or spatial selection. It may have a lower dimension than the entity of interest. For example, an image may be a spatio-temporal sample of a 3D object. |
Broader Concepts |
temporal abstract entitycon |
Broad Matches |
https://www.w3.org/ns/sosa/Samplecon |
URI | https://w3id.org/nfdi4cat/voc4cat_0005058 |
---|---|
Definition |
A representative part of an entity of interest on which observations are made and which is created by statistical sampling or subset selection. |
Broader Concepts |
non-temporal abstract entitycon |
Broad Matches |
https://www.w3.org/ns/sosa/Samplecon |
URI | https://w3id.org/nfdi4cat/voc4cat_0005059 |
---|---|
Definition |
An established standard to which the described resource conforms. This relation should be used to indicate the model, schema, ontology, or profile that the resource content conforms to. |
Broader Concepts |
resource relationcon |
URI | https://w3id.org/nfdi4cat/voc4cat_0007001 |
---|---|
Definition |
A process during which a chemical reaction is accelerated by the presence of a catalyst in a different phase than the reactant. The reaction generally proceeds at the interface. |
Broader Concepts |
catalysis research fieldcon |
URI | https://w3id.org/nfdi4cat/voc4cat_0007002 |
---|---|
Definition |
A process, during which elevated temperature is applied to increase the reaction rate of a reaction in presence of a catalyst. |
Broader Concepts |
catalysis research fieldcon |
URI | https://w3id.org/nfdi4cat/voc4cat_0007003 |
---|---|
Definition |
A substance that increases the rate of a chemical reaction that is in a different phase than the reagents. |
Broader Concepts |
catalystcon |
URI | https://w3id.org/nfdi4cat/voc4cat_0007004 |
---|---|
Definition |
The composition of chemical species fed to the inlet of a chemical reactor. |
Broader Concepts |
attributescon |
URI | https://w3id.org/nfdi4cat/voc4cat_0007005 |
---|---|
Definition |
A substance that is added to a chemical reaction. |
Broader Concepts |
non-temporal abstract entitycon |
URI | https://w3id.org/nfdi4cat/voc4cat_0007006 |
---|---|
Definition |
Those sites for adsorption which are the effective sites for a particular heterogeneous catalytic reaction. |
Broader Concepts |
non-temporal abstract entitycon |
URI | https://w3id.org/nfdi4cat/voc4cat_0007007 |
---|---|
Definition |
A type of catalytic test, where the performance of the catalyst is measured over an extended time period. Not to be performed at full conversion to be able to see catalyst deactivation, but usually also not at differential conditions to see the effect of product concentration on the catalyst. |
Broader Concepts |
actionscon |
URI | https://w3id.org/nfdi4cat/voc4cat_0007008 |
---|---|
Definition |
A type of catalytic test, where the depletion of formation of chemical substances is measured, usually performed under differential conditions |
Broader Concepts |
actionscon |
URI | https://w3id.org/nfdi4cat/voc4cat_0007009 |
---|---|
Definition |
A name for a chemical reaction which assigns the reactants and (desired) products. |
Broader Concepts |
attributescon |
URI | https://w3id.org/nfdi4cat/voc4cat_0007010 |
---|---|
Definition |
A group of chemical reactions with common conditions or reactants, e.g. Oxidation, Hydrogenation, Reduction, Cracking. |
Broader Concepts |
attributescon |
URI | https://w3id.org/nfdi4cat/voc4cat_0007012 |
---|---|
Definition |
A definition of best practice procedures to measure consistent datasets. |
Broader Concepts |
equipmentcon |
URI | https://w3id.org/nfdi4cat/voc4cat_0007013 |
---|---|
Definition |
The temperature at which a chemical reaction is happening. |
Broader Concepts |
attributescon |
URI | https://w3id.org/nfdi4cat/voc4cat_0007014 |
---|---|
Definition |
Some characteristics that define the catalyst, which can be related to composition, active phase, or role. |
Broader Concepts |
attributescon |
URI | https://w3id.org/nfdi4cat/voc4cat_0007015 |
---|---|
Definition |
A catalyst that consists mainly of the active ingredient or phase. |
Broader Concepts |
catalystcon |
URI | https://w3id.org/nfdi4cat/voc4cat_0007016 |
---|---|
Definition |
The main technique applied to make the catalyst material out of pure substances. |
Broader Concepts |
attributescon |
URI | https://w3id.org/nfdi4cat/voc4cat_0007017 |
---|---|
Definition |
An apparatus or system designed for the controlled execution of reactions, encompassing a wide range of processes including chemical, nuclear, biochemical, or other physical transformations. |
Broader Concepts |
physical entitycon |
Narrower Concepts |
chemical reactorcon electrochemical reactorcon catalytic reactorcon |
URI | https://w3id.org/nfdi4cat/voc4cat_0007018 |
---|---|
Definition |
A classification of chemical reactors based on the distinct design, configuration, and operational characteristics. Examples are stirred tank reactors, loop reactors, trickle beds, multitubular reactors, fluidized beds, and others. Each type is tailored to accomodate a specific combinations of reaction kinetics, thermodynamics, mass transfer requirements, and process variables. |
Broader Concepts |
attributescon |
URI | https://w3id.org/nfdi4cat/voc4cat_0007019 |
---|---|
Definition |
A reaction vessel characterized by continuously fed reactnts, thorough mixing of fed reactants with the contents already present in the reactor by stirring and continous removal of a product stream from the system to maintain a constant volume. |
Broader Concepts |
catalytic reactorcon |
URI | https://w3id.org/nfdi4cat/voc4cat_0007020 |
---|---|
Definition |
The part of the reactor where the catalyst is located, characterized by length, diameter, volume. |
Broader Concepts |
reactor equipmentcon |
URI | https://w3id.org/nfdi4cat/voc4cat_0007021 |
---|---|
Definition |
The bulk volume taken up by the catalyst and potential diluent in a fixed bed reactor. |
Broader Concepts |
attributescon |
URI | https://w3id.org/nfdi4cat/voc4cat_0007022 |
---|---|
Definition |
The portion of a powder catalyst sample that passes through a standard sieve of specified number and is retained by some finer sieve. |
Broader Concepts |
attributescon |
URI | https://w3id.org/nfdi4cat/voc4cat_0007023 |
---|---|
Definition |
A physical quantity given by the volumetric flow entering a control volume devided by the size of the control volume; the quantity must be given in the unit 1/hour. In heterogeneous catalysis the volume of the undiluted catalyst bed is used as characteristic control volume. In case of gases the flow at reference conditions (0°C, 100 kPa = 1 bar) is used. |
Broader Concepts |
attributescon |
URI | https://w3id.org/nfdi4cat/voc4cat_0007024 |
---|---|
Definition |
A physical quantity describing how fast a chemical reaction proceeds. It is defined by the change of the extend of reaction per unit of time. |
Broader Concepts |
attributescon |
URI | https://w3id.org/nfdi4cat/voc4cat_0007025 |
---|---|
Definition |
A reaction rate that is normalized either to mass of active ingredient, surface area or certain measured adsorption sites. |
Broader Concepts |
attributescon |
URI | https://w3id.org/nfdi4cat/voc4cat_0007026 |
---|---|
Definition |
The number of datapoints per unit of time. Inverse of sampling interval. |
Broader Concepts |
attributescon |
URI | https://w3id.org/nfdi4cat/voc4cat_0007027 |
---|---|
Definition |
A synthesis method in which a solid material (a precipitate) sediments from a liquid solution in which the material is present in a concentration greater than its solubility in the liquid. |
Broader Concepts |
actionscon |
URI | https://w3id.org/nfdi4cat/voc4cat_0007028 |
---|---|
Definition |
A synthesis method in which inorganic compounds are dissolved in a solvent and brought into contact with a solid support in order to deposit them completely or in parts onto the surface. |
Broader Concepts |
actionscon |
URI | https://w3id.org/nfdi4cat/voc4cat_0007029 |
---|---|
Definition |
A synthesis method involving the thermal treatment of a mixture of substances in aqueous solution or in form of a slurry in water characterised by heating the mixture in a sealed reaction vessel to a temperature greater than the boiling point at standard pressure . |
Broader Concepts |
processescon |
URI | https://w3id.org/nfdi4cat/voc4cat_0007030 |
---|---|
Definition |
Treatment of a solid substance or mixtures of solids at elevated temperatures. |
Broader Concepts |
actionscon |
URI | https://w3id.org/nfdi4cat/voc4cat_0007031 |
---|---|
Definition |
A method to synthesize mixed oxide/non-oxide powders by combustion of liquid precursor droplets in a flame. |
Broader Concepts |
processescon |
URI | https://w3id.org/nfdi4cat/voc4cat_0007032 |
---|---|
Definition |
A representative temperature value for the operating temperature of a reactor. In the special case of an isothermal chemical reactor, this is the same as the reaction temperature. |
Broader Concepts |
attributescon |
URI | https://w3id.org/nfdi4cat/voc4cat_0007034 |
---|---|
Definition |
A catalyst where the active material is usually the minority phase and fixed on a high surface area, relatively inert solid. |
Broader Concepts |
catalystcon |
URI | https://w3id.org/nfdi4cat/voc4cat_0007035 |
---|---|
Definition |
A device designed for the controlled execution of chemical reactions. |
Broader Concepts |
reactorcon |
Narrower Concepts |
catalytic reactorcon |
URI | https://w3id.org/nfdi4cat/voc4cat_0007036 |
---|---|
Definition |
A chemical reactor in which the reaction is carried out in the presence of a catalyst. |
Broader Concepts |
chemical reactorcon reactorcon |
Narrower Concepts |
continuous stirred tank reactorcon |
URI | https://w3id.org/nfdi4cat/voc4cat_0007038 |
---|---|
Definition |
The mass of a material sample. |
Broader Concepts |
attributescon |
URI | https://w3id.org/nfdi4cat/voc4cat_0007039 |
---|---|
Definition |
Collection of environmental variables of a reaction such as temperature, pressure, reagent concentrations and flow rate. |
Broader Concepts |
attributescon |
URI | https://w3id.org/nfdi4cat/voc4cat_0007040 |
---|---|
Definition |
A detailed description of the process leading from the reactants to the products of a reaction, including a description as complete as possible of the composition, structure, energy and other properties of reaction intermediates, products and transition states. |
Broader Concepts |
non-temporal abstract entitycon |
URI | https://w3id.org/nfdi4cat/voc4cat_0007041 |
---|---|
Definition |
A reaction for which no reaction intermediates have been detected or need to be postulated in order to describe the chemical reaction on a molecular scale. An elementary reaction is assumed to occur in a single step and to pass through a single transition state. |
Broader Concepts |
non-temporal abstract entitycon |
URI | https://w3id.org/nfdi4cat/voc4cat_0007042 |
---|---|
Definition |
The person carrying out a synthesis preparation. |
Broader Concepts |
personcon |
URI | https://w3id.org/nfdi4cat/voc4cat_0007043 |
---|---|
Definition |
The person starting or carrying out a planned process. |
Broader Concepts |
personcon |
URI | https://w3id.org/nfdi4cat/voc4cat_0007044 |
---|---|
Definition |
The fractions of atoms of a specific chemical element located at the surface of a material versus the total number of atoms of this specific element in the material. |
Broader Concepts |
attributescon |
URI | https://w3id.org/nfdi4cat/voc4cat_0007045 |
---|---|
Definition |
A physical entity which is a human beeing. |
Broader Concepts |
physical entitycon |
Narrower Concepts |
experimentercon preparatorcon |
URI | https://w3id.org/nfdi4cat/voc4cat_0007101 |
---|---|
Definition |
Chemical reactors are often classified by their abstract concept. The reactor model type characterizes the basic physicochemical behavior of a reactor and thus creates a level of comparability between reactors. Different reactor model types are often used in simulation to simplify complex equations and physical behaviors. |
Broader Concepts |
non-temporal abstract entitycon |
Narrower Concepts |
tubular reactor modelcon plug flow reactor modelcon stirred tank reactor modelcon |
URI | https://w3id.org/nfdi4cat/voc4cat_0007102 |
---|---|
Definition |
An abstract concept/ideal reactor model type in which a liquid flows uniformly through the tube, resulting in a straight wave/flow front. Each fluid element has the same residence time. |
Broader Concepts |
reactor model typecon |
URI | https://w3id.org/nfdi4cat/voc4cat_0007103 |
---|---|
Definition |
An abstract concept/ideal reactor model type, in which the volume of fluid in the reaction vessel is considered to be perfectly mixed which results in the same concentration of all components in the whole reaction volume. |
Broader Concepts |
reactor model typecon |
Narrower Concepts |
discontinuous stirred tank reactor modelcon continuous stirred tank reactor modelcon |
URI | https://w3id.org/nfdi4cat/voc4cat_0007104 |
---|---|
Definition |
A reactor model, in which opposing to the ideal plug flow behavior, friction is acting on the fluid, thus creating a residence time distribution. |
Broader Concepts |
reactor model typecon |
Narrower Concepts |
coiled tubular reactor modelcon |
URI | https://w3id.org/nfdi4cat/voc4cat_0007105 |
---|---|
Definition |
An extension of the concept of the tubular reactor model, in that the fluid does not flow though a straight tube but through a tube with regular bends, e.g. a coiled tube, which modifies the residence time distribution as compared to a straight tube. |
Broader Concepts |
tubular reactor modelcon |
URI | https://w3id.org/nfdi4cat/voc4cat_0007106 |
---|---|
Definition |
A stirred tank reactor model with always present feed and effluent streams. |
Broader Concepts |
stirred tank reactor modelcon |
URI | https://w3id.org/nfdi4cat/voc4cat_0007107 |
---|---|
Definition |
A stirred tank reactor model characterized by the absence of either feed or effluent flows. Examples modes of operation are batch (neither feed nor effluent), feed batch (only feed) , or drained batch (only effluent). |
Broader Concepts |
stirred tank reactor modelcon |
URI | https://w3id.org/nfdi4cat/voc4cat_0007201 |
---|---|
Definition |
The two electronically conducting parts of an electrochemical cell. |
Broader Concepts |
equipmentcon |
Narrower Concepts |
rotating-disk electrodecon anodecon working electrodecon reversible hydrogen electrodecon counter electrodecon reference electrodecon cathodecon |
URI | https://w3id.org/nfdi4cat/voc4cat_0007202 |
---|---|
Definition |
The electrode in a three-electrode cell where "the action is". |
Broader Concepts |
electrodecon |
URI | https://w3id.org/nfdi4cat/voc4cat_0007203 |
---|---|
Definition |
An electrode in a three-electrode cell that is used only to make an electrical connection to the electrolyte so that a current can be applied to the working electrode. |
Broader Concepts |
electrodecon |
URI | https://w3id.org/nfdi4cat/voc4cat_0007204 |
---|---|
Definition |
An electrode that has a well known and stable equilibrium electrode potential. |
Broader Concepts |
electrodecon |
URI | https://w3id.org/nfdi4cat/voc4cat_0007205 |
---|---|
Definition |
An electronic instrument that controls the electrical potential difference between the working and reference electrodes of a three-electrode cell at a preset value. |
Broader Concepts |
equipmentcon |
URI | https://w3id.org/nfdi4cat/voc4cat_0007206 |
---|---|
Definition |
An electroanalytical technique based on the measurement of the electromotive force of an electrochemical cell comprised of a measuring and a reference electrode. |
Broader Concepts |
processescon |
Narrower Concepts |
electrochemical impedance spectroscopycon chronopotentiometrycon voltammetrycon chronocoulometrycon |
URI | https://w3id.org/nfdi4cat/voc4cat_0007207 |
---|---|
Definition |
An electrochemical measuring technique used for electrochemical analysis or for the determination of the kinetics and mechanism of electrode reactions. A fast-rising potential pulse is enforced on the working electrode of an electrochemical cell and the current flowing through this electrode is measured as a function of time. |
Broader Concepts |
voltammetrycon |
URI | https://w3id.org/nfdi4cat/voc4cat_0007208 |
---|---|
Definition |
An electrochemical measuring technique used for electrochemical analysis or for the determination of the kinetics and mechanism of electrode reactions. A fast-rising current pulse is enforced on the working electrode of an electrochemical cell and the potential of this electrode is measured against a reference electrode as a function of time. |
Broader Concepts |
potentiometrycon |
URI | https://w3id.org/nfdi4cat/voc4cat_0007209 |
---|---|
Definition |
A powerful tool for examining processes occurring at electrode surfaces. A small amplitude ac (sinusoidal) excitation signal (potential or current), covering a wide range of frequencies, is applied to the system under investigation and the response (current or voltage or another signal of interest) is measured. It is routinely used in electrode kinetics and mechanism investigations, and in the characterization of batteries, fuel cells, and corrosion phenomena. |
Broader Concepts |
potentiometrycon |
URI | https://w3id.org/nfdi4cat/voc4cat_0007210 |
---|---|
Definition |
The cell voltage under zero current conditions. |
Broader Concepts |
attributescon |
URI | https://w3id.org/nfdi4cat/voc4cat_0007211 |
---|---|
Definition |
A voltammetry where the voltage changes linearly over time from a initial potential to a final potential. |
Broader Concepts |
voltammetrycon |
URI | https://w3id.org/nfdi4cat/voc4cat_0007212 |
---|---|
Definition |
An electrochemical measuring technique used for electrochemical analysis or for the determination of the kinetics and mechanism of electrode reactions. A fast-rising potential pulse is enforced on the working electrode of an electrochemical cell and the electrical charge passing through this electrode is measured as a function of time. |
Broader Concepts |
potentiometrycon |
URI | https://w3id.org/nfdi4cat/voc4cat_0007213 |
---|---|
Definition |
In cyclic voltammetry, the rate at which the potential of the working electrode is varied, i.e., = (dE/dt). The value of is always cited as positive. |
Broader Concepts |
electrical potentialcon |
URI | https://w3id.org/nfdi4cat/voc4cat_0007214 |
---|---|
Definition |
The minimal electrical potential in a cyclic voltammetry. This is where the sweep turns. |
Broader Concepts |
electrical potentialcon |
URI | https://w3id.org/nfdi4cat/voc4cat_0007215 |
---|---|
Definition |
The maximal electrical potential in a cyclic voltammetry. This is where the sweep turns. |
Broader Concepts |
electrical potentialcon |
URI | https://w3id.org/nfdi4cat/voc4cat_0007216 |
---|---|
Definition |
The electrical potential at which a linear sweep or cyclic voltammetry starts. |
Broader Concepts |
electrical potentialcon |
URI | https://w3id.org/nfdi4cat/voc4cat_0007217 |
---|---|
Definition |
The electrical potential at which a linear sweep or cyclic voltammetry ends. |
Broader Concepts |
electrical potentialcon |
URI | https://w3id.org/nfdi4cat/voc4cat_0007218 |
---|---|
Definition |
The electrical potential difference at which the potential in a linear sweep or cyclic voltammetry is altered. |
Broader Concepts |
electrical potentialcon |
URI | https://w3id.org/nfdi4cat/voc4cat_0007219 |
---|---|
Definition |
Defined as the amount of work needed per unit of electric charge to move the charge from a reference point to a specific point in an electric field. By definition, the electric potential at the reference point is zero units. A typical reference point is earth (ground). |
Broader Concepts |
attributescon |
Narrower Concepts |
lower limit potentialcon final potentialcon upper limit potentialcon scan rate potentialcon initial potentialcon step size potentialcon |
URI | https://w3id.org/nfdi4cat/voc4cat_0007220 |
---|---|
Definition |
The movement of electrical charges in a conductor; carried by electrons in an electronic conductor (electronic current) or by ions in an ionic conductor (ionic current). |
Broader Concepts |
attributescon |
Narrower Concepts |
faradaic currentcon |
URI | https://w3id.org/nfdi4cat/voc4cat_0007221 |
---|---|
Definition |
Current referred to the unit area of the electrode. Current divided by the true electrode area. |
Broader Concepts |
attributescon |
URI | https://w3id.org/nfdi4cat/voc4cat_0007222 |
---|---|
Definition |
The measure of an electrical circuit element's inability to carry electrical current. |
Broader Concepts |
attributescon |
URI | https://w3id.org/nfdi4cat/voc4cat_0007223 |
---|---|
Definition |
The final environment in which the electrochemical reaction happens. Includes possibly purged electrolyte. |
Broader Concepts |
attributescon |
URI | https://w3id.org/nfdi4cat/voc4cat_0007224 |
---|---|
Definition |
A chemical compound (salt, acid, or base) that dissociates into electrically charged ions when dissolved in a solvent. |
Broader Concepts |
equipmentcon |
URI | https://w3id.org/nfdi4cat/voc4cat_0007225 |
---|---|
Definition |
The process of treating an electrolyte solution with gas. |
Broader Concepts |
actionscon |
URI | https://w3id.org/nfdi4cat/voc4cat_0007226 |
---|---|
Definition |
Gas which is used in purging. |
Broader Concepts |
attributescon |
URI | https://w3id.org/nfdi4cat/voc4cat_0007227 |
---|---|
Definition |
Temperature for which a gas is purged through the reaction chamber. |
Broader Concepts |
attributescon |
URI | https://w3id.org/nfdi4cat/voc4cat_0007228 |
---|---|
Definition |
The number of cycles in a measurement, such as a cyclic voltammetry. |
Broader Concepts |
attributescon |
URI | https://w3id.org/nfdi4cat/voc4cat_0007229 |
---|---|
Definition |
The quotient of faradaic current to total current passed. |
Broader Concepts |
attributescon |
URI | https://w3id.org/nfdi4cat/voc4cat_0007230 |
---|---|
Definition |
The collection of instruments and devices used in an electochemical reaction. Can include electrodes, flow cells, beaker, does not include the electrochemical environment. |
Broader Concepts |
equipmentcon |
URI | https://w3id.org/nfdi4cat/voc4cat_0007231 |
---|---|
Definition |
In laboratory equipment, a beaker is generally a cylindrical container with a flat bottom. |
Broader Concepts |
equipmentcon |
URI | https://w3id.org/nfdi4cat/voc4cat_0007232 |
---|---|
Definition |
Electrochemical cell in which analyte solution flows at a constant velocity through stationary tubular electrode(s). |
Broader Concepts |
equipmentcon |
URI | https://w3id.org/nfdi4cat/voc4cat_0007233 |
---|---|
Definition |
In voltammetry: a complementary pair of forward and reverse potential sweeps. |
Broader Concepts |
attributescon |
URI | https://w3id.org/nfdi4cat/voc4cat_0007234 |
---|---|
Definition |
The phenomenon of movement (transportation) of electrical charge (that is, the electrical current) from one part of the electrochemical cell to another, occurring mainly as electromigration of ions, but it can also occur by diffusion of ions. See electrochemical potential. |
Broader Concepts |
eventscon |
URI | https://w3id.org/nfdi4cat/voc4cat_0007235 |
---|---|
Definition |
A thin structural material (usually a sheet) used to separate the electrolyte of a divided electrochemical cell into two or more compartments. |
Broader Concepts |
equipmentcon |
URI | https://w3id.org/nfdi4cat/voc4cat_0007236 |
---|---|
Definition |
The H-Cell is a two-compartment electrochemical cell used for membrane testing, hydrogen permeation, or any other experiment where two separate electrode chambers are required. |
Broader Concepts |
equipmentcon |
URI | https://w3id.org/nfdi4cat/voc4cat_0007237 |
---|---|
Definition |
An electrochemical measuring technique used for electrochemical analysis, for the determination of the kinetics and mechanism of electrode reactions, and for corrosion studies. "Voltammetry" is a family of techniques with the common characteristics that the potential of the working electrode is controlled (typically with a potentiostat) and the current flowing through the electrode is measured. |
Broader Concepts |
potentiometrycon |
Narrower Concepts |
cyclic voltammetrycon linear sweep voltammetrycon chronoamperometrycon |
URI | https://w3id.org/nfdi4cat/voc4cat_0007238 |
---|---|
Definition |
Graphical representation of the results of a voltammetric measurement. |
Broader Concepts |
processescon |
URI | https://w3id.org/nfdi4cat/voc4cat_0007239 |
---|---|
Definition |
The frequency of an alternating (ac) current is a measure of how many times the direction of the current flow changes, in the same direction, per second. As the direction of flow changes back and forth, the total number of directional changes, per second, is twice the frequency. |
Broader Concepts |
attributescon |
Narrower Concepts |
initial frequencycon final frequencycon |
URI | https://w3id.org/nfdi4cat/voc4cat_0007240 |
---|---|
Definition |
Impedance is the analogue of the resistance when applied to alternating current. That is, it is a measure of a circuit element's inability to carry the electrical current. |
Broader Concepts |
attributescon |
URI | https://w3id.org/nfdi4cat/voc4cat_0007241 |
---|---|
Definition |
Initial frequency in for example an electrochemical impedance spectroscopy. |
Broader Concepts |
frequencycon |
URI | https://w3id.org/nfdi4cat/voc4cat_0007242 |
---|---|
Definition |
Final frequency in for example an electrochemical impedance spectroscopy. |
Broader Concepts |
frequencycon |
URI | https://w3id.org/nfdi4cat/voc4cat_0007243 |
---|---|
Definition |
A commonly used reference electrode. A hydrogen electrode immersed directly into the electrolyte of the electrochemical cell and usually (unless otherwise stated) operated with one atmosphere pressure hydrogen gas. The equilibrium potential depends on the hydrogen ion concentration (strictly speaking, activity) of the cell electrolyte. |
Broader Concepts |
electrodecon |
URI | https://w3id.org/nfdi4cat/voc4cat_0007244 |
---|---|
Definition |
The measure of the amount of dissolved material (solute) in a solution. |
Broader Concepts |
attributescon |
URI | https://w3id.org/nfdi4cat/voc4cat_0007245 |
---|---|
Definition |
The mass per area on a thin film sample, i.e. the working electrode. |
Broader Concepts |
attributescon |
URI | https://w3id.org/nfdi4cat/voc4cat_0007246 |
---|---|
Definition |
A liquid that dissolves another material. |
Broader Concepts |
non-temporal abstract entitycon |
URI | https://w3id.org/nfdi4cat/voc4cat_0007247 |
---|---|
Definition |
The dissolved species (e.g., a salt) in a solution. |
Broader Concepts |
non-temporal abstract entitycon |
URI | https://w3id.org/nfdi4cat/voc4cat_0007248 |
---|---|
Definition |
A specialized hydrodynamic electrode used in the study of the kinetics and mechanism of electrode reactions and in electroanalysis for ensuring a known and controllable flow of solution over the electrode. |
Broader Concepts |
electrodecon |
URI | https://w3id.org/nfdi4cat/voc4cat_0007249 |
---|---|
Definition |
A device that converts chemical energy into electrical energy or vice versa when a chemical reaction is occurring in the cell. Typically, it consists of two metal electrodes immersed into an aqueous solution (electrolyte) with electrode reactions occurring at the electrode-solution surfaces. See also galvanic cell and electrolytic cell. |
Broader Concepts |
equipmentcon |
Narrower Concepts |
fuel cellcon galvanic cellcon electrolytic cellcon |
URI | https://w3id.org/nfdi4cat/voc4cat_0007250 |
---|---|
Definition |
Equipment used in an electrochemical setup. |
Broader Concepts |
equipmentcon |
URI | https://w3id.org/nfdi4cat/voc4cat_0007251 |
---|---|
Definition |
The measurement of the open circuit voltage of an electrochemical cell. |
Broader Concepts |
actionscon |
URI | https://w3id.org/nfdi4cat/voc4cat_0007252 |
---|---|
Definition |
A basic property of matter that gives rise to all electric and magnetic forces and interactions. |
Broader Concepts |
attributescon |
URI | https://w3id.org/nfdi4cat/voc4cat_0007253 |
---|---|
Definition |
Charge referred to the unit area of the electrode. Charge divided by electrode area. |
Broader Concepts |
attributescon |
URI | https://w3id.org/nfdi4cat/voc4cat_0007254 |
---|---|
Definition |
The electrode where reduction occurs in an electrochemical cell. It is the negative electrode in an electrolytic cell, while it is the positive electrode in a galvanic cell. |
Broader Concepts |
electrodecon |
URI | https://w3id.org/nfdi4cat/voc4cat_0007255 |
---|---|
Definition |
The electrode where oxidation occurs in an electrochemical cell. It is the positive electrode in an electrolytic cell, while it is the negative electrode in a galvanic cell. |
Broader Concepts |
electrodecon |
URI | https://w3id.org/nfdi4cat/voc4cat_0007256 |
---|---|
Definition |
An electrochemical cell that converts chemical energy into electrical energy. A cell in which chemical reactions occur spontaneously at the electrodes when they are connected through an external circuit, producing an electrical current. |
Broader Concepts |
electrochemical cellcon |
URI | https://w3id.org/nfdi4cat/voc4cat_0007257 |
---|---|
Definition |
An electrochemical cell that converts electrical energy into chemical energy. The chemical reactions do not occur "spontaneously" at the electrodes when they are connected through an external circuit. The reaction must be forced by applying an external electrical current. |
Broader Concepts |
electrochemical cellcon |
URI | https://w3id.org/nfdi4cat/voc4cat_0007258 |
---|---|
Definition |
In contrast to substrate area, the actual area of a sample or electrode which is active. |
Broader Concepts |
attributescon |
URI | https://w3id.org/nfdi4cat/voc4cat_0007259 |
---|---|
Definition |
The current that is flowing through an electrochemical cell and is causing (or is caused by) chemical reactions (charge transfer) occurring at the electrode surfaces. |
Broader Concepts |
currentcon |
URI | https://w3id.org/nfdi4cat/voc4cat_0007260 |
---|---|
Definition |
A measure of the time taken for a solute to pass through a chromatography column. It is the mean of the residence time distribution; it is known as the first moment of the residence time distribution. |
Broader Concepts |
attributescon |
URI | https://w3id.org/nfdi4cat/voc4cat_0007261 |
---|---|
Definition |
A measure which is proportional to the amount of a product with a specific retention time. After calibration it is used to calculate gas concentrations of products of an chemical experiment. |
Broader Concepts |
attributescon |
URI | https://w3id.org/nfdi4cat/voc4cat_0007262 |
---|---|
Definition |
The thickness of the membrane. |
Broader Concepts |
attributescon |
URI | https://w3id.org/nfdi4cat/voc4cat_0007263 |
---|---|
Definition |
The sum of all faradaic efficiencies in an experiment. If all current is accounted for should be 1. |
Broader Concepts |
attributescon |
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col | Collections |
con | Concepts |