Journal
APPLIED CATALYSIS B-ENVIRONMENTAL
Volume 89, Issue 1-2, Pages 87-96Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.apcatb.2008.11.015
Keywords
Perovskite-like oxide catalysts; NdSrCu1-xCoxO4-delta; Sm1.8Ce0.2Cu1-xCoxO4+delta; Methane combustion; Oxygen nonstoichiometry
Funding
- Natural Science Foundation of Beijing Municipality [KZ200610005004]
- Funding Project for Academic Human Resources Development in Institutions of Higher Learning
- RGC, Hong Kong [HKBU 200106]
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Single-phase perovskite-like oxides NdSrCu1-xCoxO4-delta and Sm1.8Ce0.2Cu1-xCoxO4+delta (x = 0, 0.2, and 0.4) were prepared using the citric acid complexing method coupled with ultrasonic treatment. We characterized the materials by a number of analytical techniques. It was found that the NdSrCu1-xCoxO4-delta and Sm1.8Ce0.2Cu1-xCoxO4+delta catalysts possess T and T crystal structures, respectively. There are Cu3+/Cu2+ ions and oxygen vacancies in the former and Cu2+/Cu+ ions and extra (over-stoichiometric) oxygen in the latter. We examined the catalytic activity of the materials for methane combustion. Methane conversion increased with a rise in the amount of nonstoichiometric oxygen over the two series of catalysts. It is concluded that oxygen nonstoichiometry and Cu3+/Cu2+ or Cu2+/Cu+ redox couples facilitate the oxidation of methane over the NdSrCu1-xCoxO4-delta and Sm1.8Ce0.2Cu1-xCoxO4+delta catalysts. (C) 2008 Elsevier B.V. All rights reserved.
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