Journal
JOURNAL OF RARE EARTHS
Volume 28, Issue 5, Pages 742-746Publisher
ELSEVIER
DOI: 10.1016/S1002-0721(09)60192-7
Keywords
CeO2-MOx solid solution; catalytic oxidation; methane combustion; CO oxidation; effect of water vapor; rare earths
Categories
Funding
- National Basic Research Program of China [2010CB732300]
- National Key Technologies R&D Program of China [2007BAJ03B01]
- National Natural Science Foundation of China [20601008]
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CeO2-MOx (M=Cu, Mn, Fe, Co, and Ni) mixed oxide catalysts were prepared by a citric acid complexation-combustion method. CeO2-MOx solid solutions could be formed with M cations doping into CeO2 lattice, while NiO and Co3O4 phases were detected on the surface of CeO2-NiO and CeO2-Co3O4 by Raman spectroscopy. The presence of M in CeO2 could obviously promote its catalytic activity for CH4 catalytic combustion and CO oxidation. Among the prepared samples, CeO2-CuO exhibited the best performance for CO oxidation. The addition of water vapor could obviously inhibit the catalytic performance of CeO2-MOx for CH4 combustion and CO oxidation, and CeO2-NiO showed good durability for CH4 wet combustion, that is, T-50 was 528 degrees C when 20% water vapor was added in the reaction stream.
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