Mo掺杂对柴油机氧化催化剂Pt/Ce-Zr的助催化作用  

Cocatalytic Effects of Molybdenum Doping on Pt/Ce-Zr Diesel Oxidation Catalysts

作　　者：黄海凤[1] 顾蕾[1] 漆仲华[1] 卢晗锋[2] 

机构地区：[1]浙江工业大学生物与环境工程学院,浙江杭州310014 [2]浙江工业大学催化反应工程研究所,浙江杭州310014

出　　处：《高校化学工程学报》2015年第4期859-865,共7页Journal of Chemical Engineering of Chinese Universities

基　　金：国家自然科学基金资助项目(21107096);浙江省重大科技专项(2013C03021)

摘　　要：采用浸渍法制备了一系列Mo改性的Pt/Ce-Zr柴油机氧化催化剂(DOC催化剂),考察其催化氧化柴油机模拟尾气时的活性和抗硫性。结果表明,掺杂适量的Mo以后,催化剂的活性和抗硫性均得到较大提升。随着Mo负载量的增加,催化剂表面氧的还原温度的变化规律呈先减后增的趋势,当Mo的负载量为3%(wt)时,催化剂表面氧的还原温度最小,可降至200℃左右。此外,在考察负载量对催化活性的影响时发现,在220oC时3%(wt)Mo掺杂量的催化剂对CO和C3H6的转化率达到95%以上。A series of Pt-Mo/Ce-Zr diesel oxidation catalysts was prepared using an impregnation method. Catalytic activity and sulfur resistance of Pt-Mo/Ce-Zr were investigated with simulated diesel exhausts. Results show that the catalytic performance and sulfur resistance of the catalysts are improved by loading molybdenum. Hydrogen consumption increases with the increase of molybdenum dosage, while the reduction temperature of the surface oxygen on catalysts decreases first and increases afterwards. This temperature reached minimum （200℃） when molybdenum loading was 3%. In addition, conversion rates of over 95% for C3H6 and CO can be achieved at 220℃.

关 键 词：DOC催化剂 Mo掺杂 低温活性 抗硫性 

分 类 号：X511[环境科学与工程—环境工程]