Mn-Y/TiO_2低温NH_3选择性催化还原NO性能研究  

Catalytic Performance Research of Mn-Y/TiO_2 for Low-temperature Selective Reduction of NO With NH_3

作　　者：张舒乐[1] 刘晓肖[1] 钟秦[1] 姚瑶[1] 李小海[1] 

机构地区：[1]南京理工大学化工学院,江苏省南京市210094

出　　处：《中国电机工程学报》2011年第35期1-6,共6页Proceedings of the CSEE

基　　金：国家863高技术基金项目(2007AA0618025);国家自然科学基金项目(51078185)~~

摘　　要：研究了稀土金属Y掺杂Mn/TiO2催化剂的低温NH3选择性催化还原NO性能。采用溶胶凝胶法制备Y掺杂的TiO2载体,负载前驱体硝酸锰构成了Y掺杂的Mn-Y/TiO2催化剂。考察Y的掺杂量,操作条件如反应温度、氧含量、进口NO浓度和空速等因素对其催化还原NO性能的影响。结果表明,Y与Ti的最佳摩尔比为1.5%,X射线衍射(X-raydiffraction,XRD)分析Y掺杂抑制了锐钛矿晶相的转移,有利于催化剂比表面积增大,从而提高催化剂的活性;在反应温度180℃、空速14000h-1、氧含量为3%、NO浓度0.06%及体积比φ(NH3)/φ(NO)为1的条件下,Mn负载量为5%,焙烧温度500℃下制备的MnTiY催化剂对NO的转化率达到93.5%。The performance of Y doped Mn/TiO2 catalysts for low-temperature selective catalytic reduction （SCR） of NO with NH3 was investigated. Y-doped TiO2 support was prepared by sol-gel method, followed by impregnation for Mn oxides loading to form Mn-Y/TiO2 catalyst. The effects of Y doping amount, the operating conditions such as temperature, oxygen content, NO concentration and space velocity factors, on the performance of catalytic reduction of NO were studied. Then the catalyst structure was analyzed by X-ray diffraction （XRD）. The results show that the optimal molar ratio of Y to Ti is 1.5%, XRD analyzed Y doping can restrain the transfer from anatase phase to rutile and the catalyst surface area is significantly increased, thereby increasing the catalytic activity. Under the conditions of temperature 180 ℃, space velocity 14 000 h-1, the oxygen content 3%, NO concentration 0.06% and φ（NH3）/φ（NO）=1, MnTiY1.5 can yield 93.5% NO conversion.

关 键 词：NH3 选择性催化还原NO 低温 Mn-Y/TiO2 Y掺杂TiO2 催化性能 

分 类 号：X511[环境科学与工程—环境工程]