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• W2139430488 abstract "CaO–CeO2 is the most effective catalyst for the conversion at 850°C of CH4 to C2H6 and C2H4 by CO2 among a series of CeO2 catalysts modified with alkali and alkaline earth metal oxides. When the CaO–CeO2 catalyst is prepared in the range of Ca/Ce ratio 0.1–0.5 by impregnation method, there exist synergistic effects between the two components for the formation of C2 hydrocarbons, and the catalyst forms solid solution. It is thus suggested that the formation of solid solution is responsible for synergistic effects. The lattice oxygen of the CaO–CeO2 catalyst converts CH4 mainly to H2 and CO, and the presence of CO2 is indispensable for C2 formation. Both C2 selectivity and C2 yield increase remarkably with increasing partial pressure of CO2, these values at 850°C reaching 75 and 4% at 70 kPa, respectively. Correlation of the results of kinetic analyses and CO2 TPD measurements indicates that the existence of the pool of the CO2 chemisorbed on the CaO–CeO2 catalyst accounts for high C2 selectivity and yield. The characterization of the binary catalyst show that bulk carbonates are not detectable during reaction and Ce3+ sites are formed at the outermost layer. It is speculated that these sites activate the chemisorbed CO2 to generate active oxygen species, which work for the conversion of CH4 to C2 hydrocarbons." @default.
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• W2139430488 date "1999-08-01" @default.
• W2139430488 modified "2023-09-27" @default.
• W2139430488 title "Carbon Dioxide as Oxidant for the Conversion of Methane to Ethane and Ethylene Using Modified CeO2 Catalysts" @default.
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• W2139430488 doi "https://doi.org/10.1006/jcat.1999.2538" @default.
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