负载型铜铈催化剂选择性氧化富氢气体中CO的催化性能

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

CO选择性氧化法是去除重整气中少量CO的有效方法。对采用共沉淀法和浸渍法制备含铜和铈的催化剂进行了比较。结果表明,负载型铜铈催化剂的最佳催化温度明显低于非负载型铜铈催化剂。用浸渍法制得的Cu-Ce/ZSM-5催化剂在180℃能将CO含量降到5×10^(-6)。考察了CO_2和H_2O对催化剂催化性能的影响,Cu-Ce/ZSM-5在最佳催化温度下具有一定的耐CO_2和H_2O能力。对Cu-Ce/ZSM-5的稳定性进行了初步考察。

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-rlch 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 CO2 and H2O in feed gas on catalytic properties of the catalyst was investigated. Cu-Ce/ZSM-5 catalyst exhibited certain CO2 and H2O resistance capability under optimal catalytic temperature. The stability of Cu-Ce/ZSM-5 catalyst was also studied.