不同金属改性Ce-Mn/ZSM-5催化剂的制备及性能研究  

Preparation and properties of Ce-Mn/ZSM-5 catalysts modified with different metals

作　　者：张乾蔚 王学涛 ZHANG Qian-wei;WANG Xue-tao(School of Vehicle and Transportation Engineering,Henan University of Science and Technology,Luoyang 471003,China)

机构地区：[1]河南科技大学车辆与交通工程学院

出　　处：《燃料化学学报》2019年第10期1265-1272,共8页Journal of Fuel Chemistry and Technology

基　　金：国家自然科学基金(50806020);河南省科技创新人才计划(杰出青年)(114100510010);河南省自然科学基金(182300410256)资助~~

摘　　要：采用浸渍法制备了一系列Y-Ce-Mn/ZSM-5催化剂(Y=Co、Cr、Cu、La、Zr)。结合NH3-SCR反应脱硝活性测试的结果,获得各种催化剂的最佳活性温度窗口及最大脱硝效率。采用XRD、TEM、H2-TPR、NH3-TPD和insituDRIFTS等技术对催化剂进行了表征。结果表明,除Cr之外,其他改性金属的最大脱硝效率均在98%以上,其中,Cu改性的Cu-Ce-Mn/ZSM-5显示出最佳的催化活性,在375℃转化率达到99.22%。原因在于表面金属氧化物种高度分散,起作用的表面弱酸酸位较多,还原性强的物种量较多。A series of Y -Ce-Mn/ZSM-5 catalysts ( Y =Co,Cr,Cu,La,Zr) were prepared by impregnation method.Combined with the results of the NH 3-SCR activity test,the optimal activity temperature window and maximum denitration efficiency of various catalysts were obtained.The catalysts were characterized by XRD,TEM,H2-TPR,NH 3-TPD and in situ DRIFTS.Through the characterization and denitration test,it was shown that the maximum denitration efficiency of all modified catalysts except Cr modified one was higher than 98%,and Cu-Ce-Mn/ZSM-5 showed the best performance among the catalysts,whose catalytic conversion at 375 ℃ was 99.22%.This is attributed to the highly dispersed surface metal oxide species,more surface sites with weak acidity and more species with high reducibility.

关 键 词：NH3-SCR Y-Ce-Mn/ZSM-5 催化剂 NOx 活性温度 脱硝效率 

分 类 号：TK229.6[动力工程及工程热物理—动力机械及工程] X701[环境科学与工程—环境工程]