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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-CeO_2 catalysts has been investigated and CuO-CeO_2 catalysts 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 CuO_x species,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-CeO_2 catalysts and causes the growth of CuO-CeO_2 because of different pH value in the precipitation process.
Influence of three different preparation methods, ieimpregnation, coprecipitation, and inverse coprecipitation, on the preferential oxidation of CO in excess hydrogen (PROX) over CuO-CeO 2 catalysts has been investigated and CuO-CeO 2 catalysts are characterized using BET, XPS, UV Raman, and TPR techniques. The results show that the catalysts prepared by coprecipitation have smaller particle sizes, well-dispersed CuO x species, more oxygen vacancies, and are more active in the PROX than those prepared by the other methods. Host, the inverse coprecipitation depresses the catalytic performance of CuO-CeO 2 catalysts and causes the growth of CuO-CeO 2 because of different pH values in the precipitation process.