Mn-Y／TiO2低温NH3选择性催化还原NO性能研究

研究了稀土金属Y掺杂MWTiO2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-ray diffraction，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0．060／0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％。

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

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 diffract...