EFFECT OF PREPARATION METHODS OF CeO2-MnOx MIXED OXIDES ON PREFERENTIAL OXIDATION OF CO IN H2-RICH GASES OVER CuO-BASED CATALYSTS

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 °c 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.