Ag/Al_2O_3催化二甲醚选择性还原NO_x的试验研究  

Experimental Study of Dimethyl-Ether Selective Catalytic Reduction NO_x over Ag/Al_2O_3 Catalyst

作　　者：刘佳[1] 陈晓玲[1] 吴娇[1] 周相满[1] 张武高[1] 

机构地区：[1]上海交通大学动力机械与工程教育部重点实验室,上海200240

出　　处：《上海交通大学学报》2011年第6期851-855,860,共6页Journal of Shanghai Jiaotong University

基　　金：国家自然科学基金资助项目(50976070)

摘　　要：为了拓展二甲醚(DME)在低温条件下选择性催化还原NOx的效果,采用浸渍法制备了Ag/γ-Al2O3催化剂,试验研究了反应温度、Ag/γ-Al2O3质量分数、氧含量、NOx源、DME/NO摩尔比对NOx转化率的影响.结果表明,Ag/γ-Al2O3催化剂在低温条件下具有良好的脱氮性能,在200°C时就显示较高的活性,随着温度的升高,NOx转化率先增大后减小;Ag/γ-Al2O3的催化活性随氧含量的增加先增大后减小,氧含量约为8%时催化效果最佳;最佳Ag质量分数约为3%;DME/NO最佳摩尔比为2;催化活性基本不受NOx源的影响.In order to expand the low temperature range of selective catalytic reduction（SCR） NOx by dimethyl-ether（DME）,NOx conversion to N2 over Ag/γ-Al2O3 catalyst was experimentally studied.The catalyst was prepared by using impregnation method,and the influence of the reaction temperature,the content of Ag,the oxygen concentration,NOx source and the molar ratio of DME/NO were investigated respectively.The results show that Ag/γ-Al2O3 displays favorable activity even at 200 °C and the NOx conversion ratio increases at the beginning and then decreases as the temperature increasing.The NOx conversion ratio climbs up and then declines as the oxygen concentration increasing,and the best catalyst activity appears when oxygen content is about 8%.The Ag loading of about 3% can get best catalyst activity,and the DME/NO molar ratio for the highest NOx conversion is 2.The influence of NOx source on NOx conversion is very small.

关 键 词：选择性催化还原 二甲醚 NOx Ag/γ-Al2O3催化剂 

分 类 号：TK46[动力工程及工程热物理—动力机械及工程]