Autor: Bao-qing Li, Shoumin Zhang, Xiao-Hang Qiu, Weiping Huang, Xiu-cheng Zheng, Shihua Wu
Rok vydání: 2002
Předmět:
Zdroj: Catalysis Letters. 80:41-46
ISSN: 1011-372X
DOI: 10.1023/a:1015318525080
Popis: Cu/CeO2 and CuO/CeO2 catalysts were prepared by solvated metal atom impregnation (SMAI) and conventional impregnation (CI) and used for carbon monoxide oxidation in CO and air. The catalysts were characterized by means of XRD, XPS, AES and H2-TPR techniques. The Cu/CeO2 catalyst prepared via SMAI exhibits higher catalytic activity in CO oxidation than that prepared via CI with the same Cu content due to the smaller Cu particles. The CuO/CeO2 catalyst prepared via SMAI also shows higher catalytic activity than that prepared via CI because the CuO particles of the former are smaller than the latter and can be reduced by CO more easily. The Cu/CeO2 catalysts display higher catalytic activities than CuO/CeO2 catalysts with the same Cu content and prepared by the same method. The TPR profile for CuO/CeO2 catalyst prepared via SMAI has a single peak, indicating a one-step reduction, whereas the TPR profile for CuO/CeO2 catalyst prepared via CI has two peaks, indicating a two-step reduction due to the existence of two kinds of CuO species.
Databáze: OpenAIRE
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