Catalytic oxidative conversion of methane and ethane over polyoxometalate-derived catalysts in electric field at low temperature
| Autor: | Tomohiro Yabe, Kousei Iwasaki, Shuhei Ogo, Yasushi Sekine, Kei Sugiura, Ayaka Sato |
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| Rok vydání: | 2018 |
| Předmět: |
chemistry.chemical_classification
biology 010405 organic chemistry Inorganic chemistry Active site Salt (chemistry) General Chemistry 010402 general chemistry 01 natural sciences Catalysis Methane 0104 chemical sciences chemistry.chemical_compound chemistry Electric field Polyoxometalate biology.protein Oxidative coupling of methane Dehydrogenation |
| Zdroj: | Catalysis Today. 299:80-85 |
| ISSN: | 0920-5861 |
| Popis: | We examined oxidative coupling of methane (OCM) and oxidative dehydrogenation of ethane (ODE) over various polyoxometalate supported CeO 2 catalysts at 423 K in an electric field. Tetrabutylammonium (TBA) salt of Keggin-type phosphotungstate (PW 12 O 40 ) supported CeO 2 catalysts ((TBA) 3 PW 12 O 40 /CeO 2 ) showed high activities for OCM and ODE in the electric field (3 mA) at 423 K, although the catalyst without the electric field showed extremely low activities at such low temperature. FT-IR spectra and XRD patterns confirmed that the structure of (TBA) 3 PW 12 O 40 /CeO 2 was changed to Ce 2 (WO 4 ) 3 /CeO 2 after reactions with the electric field, and it acted as an active site structure for OCM and ODE with the electric field. Results of activity tests revealed that the C 2 H 6 production was a main reaction in OCM with the electric field, and C 2 H 4 was formed through a successive oxidative dehydrogenation of the formed C 2 H 6 . Periodic operation tests demonstrated that reactive oxygen species suitable for ODE were formed on the catalyst surface of Ce 2 (WO 4 ) 3 in the electric field. |
| Databáze: | OpenAIRE |
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