氧化还原沉淀法制备MnO_x-SnO_2催化剂及其对NO的NH_3选择催化还原性能  

MnO_x-SnO_2 Catalysts Synthesized by a Redox Coprecipitation Method for Selective Catalytic Reduction of NO by NH_3

作　　者：唐幸福[1] 李俊华[1] 魏丽斯[1] 郝吉明[1] 

机构地区：[1]清华大学环境科学与工程系,北京100084

出　　处：《催化学报》2008年第6期531-536,共6页

基　　金：国家自然科学基金(20437010;20637001;20707012)

摘　　要：采用氧化还原共沉淀法制备了MnOx-SnO2复合氧化物,并将其用于低温NH3选择催化还原NO反应.结果表明,Mn/(Mn+Sn)摩尔比为75%的催化剂具有最好的低温催化活性,在120～200℃温度范围内得到100%的NO转化率.氮吸附-脱附、X射线衍射和X射线光电子能谱测试表明,高比表面积、Mn-Sn固溶体的形成和高氧化态的Mn物种是催化剂催化活性较高的主要原因.MnOx-SnO2 composite oxides prepared by a redox coprecipitation route were tested in selective catalytic reduction of NO by NH3 at low temperature. The results showed that the MnOx-SnO2 catalyst with a Mn/（Mn ＋ Sn） molar ratio of 75 % exhibited the best performance, on which NO conversion of 100 % could be achieved at temperatures of 120 - 200℃. The characterization results of N2 adsorption-desorption, X-ray diffraction, and X-ray photoelectron spectroscopy indicated that the higher surface area, the formation of solid solution between manganese and tin oxides, and the high oxidation state manganese species were responsible for the high catalytic activity of the MnOx-SnO2 catalyst.

关 键 词：氧化锰 氧化锡 复合氧化物 氨 选择催化还原 一氧化氮 低温 氧化还原共沉淀法 

分 类 号：O643.32[理学—物理化学] X511[理学—化学]