Liu Hua^1,2, Xu Shan¹, Wang Xiaolai^1*

(1 State Key Laboratory for Oxo Synthesis and Selective Oxidation, Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences, Lanzhou, 730000, P R China. 2 Graduate University of Chinese Academy of Sciences, Beijing, 100039, P.R. China)

Abstract: Mesoporous Co₃O₄-CeO₂ mixed oxides was synthesized by a bi-solvent method which introduced SBA-15 as the hard template and cerium nitrate and cobalt nitrate as precursors. The active composite and support were characterized by techniques of X-ray powder diffraction, nitrogen adsorption/desorption, temperature programmed reduction and transmission electron microscopy. The experimental results show that compared with the catalysts prepared by impregnation and co-precipitation methods, the catalyst prepared by the bi-solvent method displayed the uniform mesoporous structure, the smaller particle size, the higher surface area and the high dispersion of active composites. In addition, the as-prepared mesoporous Co₃O₄-CeO₂ showed a superior performance of CO oxidation over catalysts of traditional preparation protocols of impregnation method and coprecipitation method, which can be ascribe to the high surface area and high dispersion of the catalyst.

Key words: bi-solvent method; mesoporous Co₃O₄-CeO₂; nanomaterials; CO oxidation

E-mail: xlwang@licp.cas.cn

Journal of Molecular Catalysis, Vol. 25, Issue 4, 2011, 301~307