Catalytic properties of supported copper-cerium catalysts for selective oxidation of CO in hydrogen-rich stream

Selective oxidation of CO is an efficient method to reduce the small amount of CO in reformed gas. The different catalysts contained copper and cerium for selective oxidation of CO in hydrogen-rich stream were prepared by co-precipitation and impregnation method and were compared. The results indicated that the optimal catalytic temperature of supported copper-cerium catalysts was significantly lower than that of the unsupported one. Cu-Ce/ZSM-5 catalyst prepared by impregnation method could reduce CO concentration to 5×10~(-6) at 180℃. The influence of CO_2 and H_2O in feed gas on catalytic properties of the catalyst was investigated. Cu-Ce/ZSM-5 catalyst exhibited certain CO_2 and H_2O resistance capability under optimal catalytic temperature. The stability of Cu-Ce/ZSM-5 catalyst was also studied.