The Catalysts of Au(x)/CuCeO<sub>2</sub> for Preferential Oxidation of Carbon Monoxide and Dynamics in Hydrogen Rich Atmosphere Potentially Applied in Fuel Cell

A series of CuO-CeO 2 catalysts were prepared by coprecipitation method which were characterized by BET, XRD and TPR, respectively.The activity of the prepared catalysts for preferential oxidation of CO was evaluated in a fixed bed reactor.TPR showed that the catalysts of CuO-CeO 2 mainly appeared two characteristic peaks at the range of 60~400ºC, i.e. low temperature α peak (160~180ºC) and high temperature β peak (180~200ºC).The ratio of α/(α+β) was the largest when the content of Cu was 8.4(wt.)% on CuO-CeO 2 samples, i.e. the catalyst of Cu(8.0)CeO, which was consistent with that its best activity under used experimental conditions.A series of catalysts of Au(x)/Cu(8.0)CeO were prepared by using Cu(8.0)CeO as precursor with impregnation method.SEM characterization showed that Au could evenly distributed on Cu(8.0)CeO with nano size under the prepared experimental conditions.The activity over the prepared series of Au(x)/Cu(8.0)CeO catalysts for selective oxidation removal of CO showed that it was increased with increasing Au loading, while its activity of Au(x)/Cu(8.0)CeO catalysts did not increase significantly when the Au loading was increased from 0.52(wt.)%to 0.78(wt.)%,which indicated that the appropriate content of Au was 0.52(wt.)%on Cu(8.0)CeO, i.e.Au(0.5)/Cu(8.0)CeO.The oxidation dynamics of CO and H 2 over Au(0.5)/Cu(8.0)CeOwas measured in a gradientless reactor and the multiple kinetic regression equations of the oxidation reactions of CO and H 2 were obtained, respectively, which provided the basis for the further study of preferential oxidation of CO performed on Au(0.5)/Cu(8.0)CeO.