Methane Oxidation Over M–8YSZ and M–CeO2/8YSZ (M = Ni, Cu, Co, Ag) Catalysts |
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Authors: | Masaki Itome Alan E Nelson |
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Affiliation: | (1) Department of Chemical and Materials Engineering, University of Alberta, Edmonton, Alberta, T6G 2G6, Canada |
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Abstract: | The oxidation of methane has been studied by sequential flow reaction experiments over M–8YSZ and M–CeO2/8YSZ (M=Ni, Cu, Co, Ag) catalysts as a function of CH4/O2 from 773 to 1073 K. Over Ni–8YSZ and Ni–CeO2/8YSZ, methane pyrolysis is dominant leading to surface carbon formation at temperatures of 873 K and above. While the addition
of ceria to Ni–8YSZ to produce Ni–CeO2/8YSZ does not significantly affect the reaction kinetics, the activity of Cu–CeO2/8YSZ, Co–CeO2/8YSZ, and Ag–CeO2/8YSZ are higher than their M–8YSZ counterparts. The activity of Co–CeO2/8YSZ at high temperatures (973 K and above) is higher than Ni-8YSZ with selectivity towards partial methane oxidation and
CO formation. Considering Ni-based catalysts are prone to deactivation due to surface carbon accumulation, Co–CeO2/8YSZ, Cu–CeO2/8YSZ, and Ag–CeO2/8YSZ are possible alternative anode cermets for direct hydrocarbon oxidation solid-oxide fuel cells (SOFC). |
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Keywords: | methane oxidation kinetics carbon deposition SOFC |
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