Influence of preparation methods on CuO-CeO2 catalysts in the preferential oxidation of CO in excess hydrogen

Influence of three different preparation methods,i.e.impregnation,coprecipitation,and inverse coprecipitation,on the preferential oxidation of CO in excess hydrogen （PROX） over CuO-CeOcatalysts has been investigated and CuO-CeOcatalysts are characterized using BET,XPS,XRD,UV Raman,and TPR techniques.The results show that the catalysts prepared by coprecipitation have smaller particle sizes,well-dispersed CuOspecies,more oxygen vacancies,and are more active in the PROX than those prepared by the other methods.However,the inverse coprecipitation depresses the catalytic performance of CuO-CeOcatalysts and causes the growth of CuO-CeObecause of different pH value in the precipitation process.