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Low-temperature CO oxidation over CuO-CeO2/SiO2 catalysts:Effect of CeO2 content and carrier porosity

The effects of CeO2 contents and silica carrier porosity with their pore diameters ranging from 5.2 nm to 12.5 nm of CuO-CeO2/SiO2 cata-lysts in CO oxidation were investigated.The catalysts were characterized by N2 adsorption/desorption at low temperature,X-ray diffraction (XRD),temperature-programm...

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Bibliographic Details
Published in:Journal of natural gas chemistry 2010-07, Vol.19 (4), p.355-361
Main Authors: Luo, Jingjie, Chu, Wei, Xu, Huiyuan, Jiang, Chengfa, Zhang, Tao
Format: Article
Language:English
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Summary:The effects of CeO2 contents and silica carrier porosity with their pore diameters ranging from 5.2 nm to 12.5 nm of CuO-CeO2/SiO2 cata-lysts in CO oxidation were investigated.The catalysts were characterized by N2 adsorption/desorption at low temperature,X-ray diffraction (XRD),temperature-programmed reduction by H2 (H2-TPR),oxygen temperature programmed desorption (O2-TPD) and X-ray photoelectron spectroscopy (XPS).The results suggested that,the ceria content and the porosity of SiO2 carrier possessed great impacts on the structures and catalytic performances of CuO-CeO2/SiO2 catalysts.When appropriate content of CeO2 (Ce content 8 wt%) was added,the catalytic activity was greatly enhanced.In the catalyst supported on silica carrier with larger pore diameter,higher dispersion of CuO was observed,better agglomeration-resistant capacity was displayed and more lattice oxygen could be found,thus the CuO-CeO2 supported on Si-1 showed higher catalytic activity for low-temperature CO oxidation.
ISSN:1003-9953
DOI:10.1016/S1003-9953(09)60088-8