堇青石负载Pd和过渡金属氧化物催化剂的表征及其对CO的催化氧化活性

以堇青石蜂窝陶瓷(CC)为载体，采用浸渍法制备了堇青石负载Pd和过渡金属混合氧化物催化剂，记作Pd-M-Mn(M=Cu，Co，Fe，Ni)/CC。实验结果表明:Pd-Co-Mn/CC催化剂的催化活性最高;随着Pd负载量的增加，CO转化率提高;当Pd负载量为1.00%时，反应温度为150℃时CO转化率达到98%，200℃时CO转化率达到100%;在反应温度150℃条件下，Pd-Co-Mn/CC催化剂(Pd负载量1.00%)的CO转化率在前30h内小幅度下降，随后稳定在90%以上，反应100h后，催化剂表面颜色由黑色变为棕褐色。

Characterization of Cordierite-supported Pd and Transition Metal Oxide Catalysts and Their Catalytic Oxidation Activities for CO

Using cordierite honeycomb ceramic (CC) as carrier,the cordierite-supported Pd and transition metal oxide catalysts (Pd-M-Mn(M=Cu,Co,Fe,Ni)/CC) were prepared by impregnation method. The experimental results show that:The catalytic activity of Pd-Co-Mn/CC is the highest;The CO conversion increases with the increasing of Pd loading;When the Pd loading is 1.00%,the CO conversion is 98% with 150 ℃ of reaction temperature and 100% with 200 ℃ of reaction temperature;Under the condition of reaction temperature 150 ℃,the CO conversion on Pd-Co-Mn/CC with 1.00% of Pd loading is decreased to above 90% in 30 h;After 100 h of reaction,the color of the catalyst surface is changed from black to brown.