负载型钼氧化物催化剂NH_3选择性催化还原NO_x  

Molybdenum-containing oxide catalysts for selective catalytic reduction of NO_x with NH_3

作　　者：张亚平[1] 赵晓媛[1] 孙克勤[1] 沈凯[1] 徐海涛[1] 周长城[1] 

机构地区：[1]东南大学能源与环境学院,南京210096

出　　处：《东南大学学报（自然科学版）》2011年第5期1030-1035,共6页Journal of Southeast University：Natural Science Edition

基　　金：国家高技术研究发展计划(863计划)资助项目(2007AA061802);江苏省自然科学基金重点资助项目(BK2008001)

摘　　要：通过浸渍法制备了Mo/TiO2,Mn-Mo/TiO2和Mo-Mn/TiO2三种催化剂,采用X射线衍射(XRD)、比表面积测定(BET)、拉曼光谱(LRS)、原位红外(in situ FT-IR)、扫描电镜(SEM)等技术进行相关的微观表征分析.在模拟氨气选择性催化还原NO的反应条件下(NH3-SCR)对催化剂的脱硝反应活性进行了考察.结果表明,不同浸渍顺序添加锰氧化物后得到的催化剂能够提高NO的脱除效率,但是活性差别很大,其中催化剂Mn-Mo/TiO2的低温活性比较高,活性温度窗口窄,催化剂Mo-Mn/TiO2的高温活性比较高,活性温度窗口宽.模拟烟气中含有0.02%SO2(体积分数)时,催化剂Mn-Mo/TiO2和Mo/TiO2的NO转化率都有所下降,但是添加Mn可提高催化剂Mo/TiO2抗SO2毒性的能力.A series of molybdenum-containing oxides supported on TiO2,Mo/TiO2,Mn-Mo/TiO2and Mo-Mn/TiO2catalysts,were prepared by impregnation method.These catalysts were characterized by using X-ray diffraction（XRD）,BET（brunauer,emmett and teller） surface area,Laser Raman spectroscopy（LRS）,scanning electron microscope（SEM） and in situ Fourier transform infrared spectroscopy（in situ FT-IR）.Their catalytic performance for the selective catalytic reduction of NO with NH3（NH3-SCR）was investigated.It is found that the addition of manganese oxide increases the NO conversion of Mo/TiO2 catalysts while a big difference of catalytic activity is shown due to different impregnation orders of manganese oxide.Mn-Mo/TiO2 catalyst exhibits better performance at low temperature but within a narrow temperature range compared with the Mo-Mn/TiO2 sample.The introduction of 0.02% SO2（volume ratio） in the simulated smog reduces the NO conversion of Mn-Mo/TiO2 and Mo/TiO2 catalysts apparently while the manganese-containing Mo/TiO2 catalyst possesses a stronger resistance to SO2.

关 键 词：钼氧化物 锰氧化物 催化剂 浸渍顺序 氨气选择性催化还原 

分 类 号：X5[环境科学与工程—环境工程]