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Functional Analysis of Catalysts for Lower Alkane Oxidation
- Source :
- ChemCatChem
- Publication Year :
- 2017
- Publisher :
- Wiley, 2017.
-
Abstract
- The catalytic performance of 1) crystalline MoVTeNb oxide that exhibits the electronic properties of a n-type semiconductor, 2) submonolayer vanadium oxide supported on meso-structured silica (SBA-15) as an insulating support, and 3) surface-functionalized carbon nanotubes that contain neither a redox active metal nor bulk oxygen, but only surface oxygen species have been compared in the oxidative dehydrogenation of ethane and propane under equal reaction conditions. The catalytic results indicate similarities in the reaction network over all three catalysts within the range of the studied reaction conditions implying that differences in selectivity are a consequence of differences in the rate constants. Higher activity and selectivity to acrylic acid over MoVTeNb oxide as compared to the other two catalysts are attributed to the higher density of potential alkane adsorption sites on M1 and the specific electronic structure of the semiconducting bulk catalyst. Microcalorimetry has been used to determine and quantify different adsorption sites revealing a low Vsurface/C3H8 ads ratio of 4 on M1 and a much higher ratio of 150 on silica-supported vanadium oxide. On the latter catalyst less than one per cent of the vanadium atoms adsorb propane. Barriers of propane activation increase in the order P/oCNT (139 kJ mol−1)≤M1 (143 kJ mol−1)−1), which is in agreement with trends predicted by theory.
- Subjects :
- Alkane
chemistry.chemical_classification
010405 organic chemistry
Organic Chemistry
Inorganic chemistry
Oxide
Vanadium
chemistry.chemical_element
010402 general chemistry
01 natural sciences
Catalysis
Vanadium oxide
0104 chemical sciences
Inorganic Chemistry
chemistry.chemical_compound
Reaction rate constant
chemistry
Propane
Dehydrogenation
Physical and Theoretical Chemistry
Subjects
Details
- ISSN :
- 18673880
- Volume :
- 9
- Database :
- OpenAIRE
- Journal :
- ChemCatChem
- Accession number :
- edsair.doi.dedup.....985d190c3369555e320ee0d2361e4b25