The preparation and catalytic behavior of copper–cerium oxide catalysts for low-temperature carbon monoxide oxidation

CeO 2 nano-crystals were synthesized by a sol–gel process and then used as support for CuO/CeO 2 (sol–gel) catalysts prepared via impregnation method. For comparison, the commercial CeO 2 was also used as a support for CuO/CeO 2 (commercial) catalysts prepared via the same method. The samples were c...

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Bibliographic Details
Published in:Applied catalysis. A, General General, 2005-04, Vol.283 (1), p.217-223
Main Authors: Zheng, Xiu-Cheng, Wu, Shi-Hua, Wang, Shu-Ping, Wang, Shu-Rong, Zhang, Shou-Min, Huang, Wei-Ping
Format: Article
Language:English
Subjects:
Carbon monoxide oxidation
Catalysis
CeO 2
Chemistry
Colloidal gels. Colloidal sols
Colloidal state and disperse state
CuO/CeO 2
Exact sciences and technology
General and physical chemistry
Sol–gel method
Theory of reactions, general kinetics. Catalysis. Nomenclature, chemical documentation, computer chemistry
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Summary:CeO 2 nano-crystals were synthesized by a sol–gel process and then used as support for CuO/CeO 2 (sol–gel) catalysts prepared via impregnation method. For comparison, the commercial CeO 2 was also used as a support for CuO/CeO 2 (commercial) catalysts prepared via the same method. The samples were characterized by means of BET, XRD, UV–vis, TPR and XPS. The catalytic properties of the CuO/CeO 2 catalysts for low-temperature CO oxidation were studied by using a microreactor-GC system. The prepared spherical CeO 2 nano-crystals have much smaller particle size, better crystallinity and larger surface area than the commercial CeO 2. XPS analysis indicated the presence of reduced copper species in the CuO/CeO 2 catalysts. TPR showed that there are different copper species in the catalysts. The influence of calcination time, temperature and CuO loadings on the catalytic activity of CuO/CeO 2 catalysts has been studied. The CuO/CeO 2 (sol–gel) catalysts exhibited higher catalytic activity than the CuO/CeO 2 (commercial) catalysts. Compared with CuO/CeO 2 catalysts prepared via other techniques, our catalysts exhibited similar or even better catalytic performance.
ISSN:0926-860X
1873-3875
DOI:10.1016/j.apcata.2005.01.007