添加铈对Cu-Co-O催化剂催化燃烧VOCs性能影响

Effect of Ce on the activity of Cu-Co-O catalyst in catalytic combustion of VOCs

以γ-Al_2O_3为载体,采用超声-等体积浸渍法制备CeO_2掺杂的Cu-Co-O/Al_2O_3催化剂,考察了催化剂对甲苯的催化燃烧性能,通过X线衍射(XRD)、程序升温还原(H_2-TPR)和扫描电子显微镜(SEM)等技术对催化剂进行表征.结果表明:稀土元素的加入不仅有利于活性组分在催化剂表面的分散,而且可以促进Cu-Co-O催化剂的还原温度向着低温方向发生移动.活性评价实验结果显示,进气浓度对催化剂催化活性的影响不大.添加Ce后催化剂对甲苯和二甲苯的催化燃烧反应温度均有不同幅度降低,其中对甲苯的效果更为显著.

The CeO2doped Cu-Co-O/Al2O3catalyst was prepared by ultrasonic-incipient wetness impregnation methodusing Al2O3as a carrier.The catalytic activity of the prepared catalyst was investigated by catalytic combustion of VOCs.XRD,H2-TPR,SEM techniques were performed to characterize the catalyst.The results showed that the dispersion ofactive species increased after the doping of cerium oxide.Meanwhile,the reduction temperature of Cu-Co-O catalystreduced.The activity evaluation results showed that inlet concentration could not greatly influence the catalyticperformance of the prepared catalyst.The reaction temperature of toluene and xylene combustion decreased after thedoping of Cerium,especially for toluene combustion.