常温常湿条件下CO氧化铂-钯催化剂制备的研究

Effects of Preparation Conditions on Catalytic Performance of Pt-Pd Catalysts for CO Oxidation

采用浸渍法制备负载型铂-钯催化剂,比较详尽的考察了制备条件对其催化CO氧化活性的影响.结果表明:常温浸渍、陈化时间大于5 h、H2还原制得的催化剂,具有很好的低温活性和抗湿性.在相对湿度大于90%和空气中含100 ppm CO的条件下,Pt、Pd含量均为0.3%的催化剂在1 h内对CO的常温消除效率高于90%.

Supported Pt-Pd Catalysts were prepared by impregnation, and the effects of preparation conditions on catalytic performance for CO oxidation over these catalysts were studied in detail. It was found that, the Pt-Pd Catalyst prepared by normal temperature impregnation, impregnating-time 〉 5 h, reduced by H2, exhibited best low temperature activity and resistance to moisture. Under the conditions of relative humidity 〉90% and 100 ppm CO in air, the average CO conversion of 0.3% Pt-0.3% Pd catalyst at room temperature was higher than 90% in 1 h.