Divanadium substituted keggin [PV2W10O40] on non-reducible supports-Al2O3 and SiO2: synthesis, characterization, and catalytic properties for oxidative dehydrogenation of propane
| Autor: | D. T. Shuaib, Christopher L. Marshall, M. Ishaque Khan, Jose C. Orozco |
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| Rok vydání: | 2020 |
| Předmět: |
Hydrogen
010405 organic chemistry Chemistry Inorganic chemistry Oxide chemistry.chemical_element 010402 general chemistry 01 natural sciences Catalysis 0104 chemical sciences Ammonia chemistry.chemical_compound Propane Desorption Dehydrogenation Physical and Theoretical Chemistry Incipient wetness impregnation |
| Zdroj: | Reaction Kinetics, Mechanisms and Catalysis. 131:753-768 |
| ISSN: | 1878-5204 1878-5190 |
| DOI: | 10.1007/s11144-020-01893-7 |
| Popis: | Molecular metal oxide cluster, K5[α-1,2-PV2W10O40] (PV2W10), was found to have intrinsic catalytic activity for the oxidative dehydrogenation of propane with high selectivity (> 80%) to propylene at low propane conversion (0.3%). Synthesis of dispersed PV2W10 in non-reducible supports, γ-Al2O3 and SiO2, was done by incipient wetness impregnation. The supported catalysts were characterized by IR, Raman spectroscopy, nitrogen adsorption, x-ray powder diffraction (PXRD), elemental analysis, hydrogen temperature-programmed reduction (H2–TPR), and ammonia temperature-programmed desorption (NH3–TPD). Catalytic testing of the supported PV2W10 at equimolar cluster concentration revealed that when supported in γ-Al2O3 it is more active (sevenfold increase in propane conversion) but in SiO2 it is more selective to propylene (94%). The observed performance was due to both an increase in reducibility and higher concentration of strong acid sites for PV2W10 supported in γ-Al2O3 versus SiO2. Lastly, PV2W10 was shown to remain intact under reaction conditions indicating its thermal and oxidative stability. |
| Databáze: | OpenAIRE |
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