Low-temperature catalytic oxidative coupling of methane in an electric field over a Ce-W-O catalyst system
| Autor: | Tomohiro Yabe, Yasushi Sekine, Kei Sugiura, Kousei Iwasaki, Shuhei Ogo |
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| Rok vydání: | 2016 |
| Předmět: |
Multidisciplinary
Materials science 010405 organic chemistry Inorganic chemistry chemistry.chemical_element 010402 general chemistry 01 natural sciences Oxygen Redox Methane Article 0104 chemical sciences Catalysis symbols.namesake chemistry.chemical_compound chemistry Electric field symbols Oxidative coupling of methane Raman spectroscopy Selectivity |
| Zdroj: | Scientific Reports |
| ISSN: | 2045-2322 |
| Popis: | We examined oxidative coupling of methane (OCM) over various Ce–W–O catalysts at 423 K in an electric field. Ce2(WO4)3/CeO2 catalyst showed high OCM activity. In a periodic operation test over Ce2(WO4)3/CeO2 catalyst, C2 selectivity exceeded 60% during three redox cycles. However, Ce2(WO4)3/CeO2 catalyst without the electric field showed low activity, even at 1073 K: CH4 Conv., 6.0%; C2 Sel., 2.1%. A synergetic effect between the Ce2(WO4)3 structure and electric field created the reactive oxygen species for selective oxidation of methane. Results of XAFS, in-situ Raman and periodic operation tests demonstrated that OCM occurred as the lattice oxygen in Ce2(WO4)3 (short W–O bonds in distorted WO4 unit) was consumed. The consumed oxygen was reproduced by a redox mechanism in the electric field. |
| Databáze: | OpenAIRE |
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