%0 Journal Article
%T EFFECT OF PREPARATION METHODS OF CeO2-MnOx MIXED OXIDES ON PREFERENTIAL OXIDATION OF CO IN H2-RICH GASES OVER CuO-BASED CATALYSTS
%A LEI GONG
%A LAI-TAO LUO
%A RUI WANG
%A NING ZHANG
%J Journal of the Chilean Chemical Society
%D 2012
%I Sociedad Chilena de Qu¨ªmica
%X The CeO2-MnOx mixed oxides were prepared by deposition-precipitation (DP) and surfactant-templated (CB) methods, and then used as the support of CuO/ CeO2-MnOx catalysts. The samples were characterized by means of XRD, BET, H2-TPR, CO-TPD and XPS. Results show that preparation methods of CeO2-MnOx support have a direct effect on the physicochemical properties and catalytic activities of CuO/CeO2-MnOx catalysts for the CO preferential oxidation in H2-rich gases(CO PROX). CuO/CeO2-MnOx (CB) catalyst exhibits higher CO conversion and stability in H2-rich gases than CuO/CeO2-MnOx (DP), with 100% conversion of CO at 140 ¡ãC after a temperature cycle, which indicates that CeO2-MnOx (CB) as support of CuO based catalyst is more useful for CO PROX reaction than CeO2-MnOx (DP). Compared with CuO/CeO2-MnOx (DP), there are richer oxygen vacancies and more Mn4+ species on the surface of CuO/CeO2-MnOx (CB), and stronger interaction between CeO2 and MnOx in it. More amounts of active copper species and complicated transfer of electrons density on CuO/CeO2-MnOx (CB) also favour the activity of the catalyst.
%K CuO/CeO2-MnOx catalyst
%K Preparation method of CeO2-MnOx
%K CO oxidation
%K In H2-rich gases
%U http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-97072012000100020