Abstract: Low-temperature denitration catalyst Mn-Fe-Ce/TiO2 was prepared by impregnation，coprecipitation and sol-gel methods. The effects of preparation methods on denitrification performance were studied and the preparation conditions were optimized. X-ray diffraction (XRD) and transmission electron microscope (TEM) were used to determine the characteristics of the catalyst. The effect of SO2 concentration on its performance was also studied. The catalyst pepared by the sol-gel method (load capacity 30%，catalyst molar ratio of Mn/Fe/Ce 4∶1∶0.1，calcination temperature 500 ℃) showed higher denitrification rate and its activity reached more than 96%. The crystal of the catalyst carrier was anatase TiO2，but FeOx，CeOx remained amorphous structure. The poisoned catalyst self-repaired when the concentration of SO2 was less than 70 mg/m3 after stopping addition of SO2 into flue gas，and it was poisoned permanently when the SO2 was greater than 70 mg/m3.

Key words: low tempreture, selective catalystic reduction, preparation method, flue gas denitration, sulfur resistant property

摘要： 采用浸渍法、共沉淀法、溶胶-凝胶法制备了Mn-Fe-Ce/TiO2低温SCR催化剂，考察了制备方法对催化剂脱硝效果的影响，对制备条件进行优化，通过X线衍射仪（XRD）和透射电子显微镜（TEM）对催化剂进行表征，并考察了SO2浓度对催化剂脱硝性能的影响。结果表明，通过溶胶-凝胶法制备的Mn-Fe-Ce/TiO2催化剂负载量为30%，n(Mn)∶n(Fe)∶n (Ce)=4∶1∶0.1，500 ℃焙烧时脱硝性能最佳，达95%以上，催化剂的载体主要以锐钛矿型TiO2晶型存在，FeOx、CeOx保持无定形的结构，通入烟气中SO2的浓度≤70 mg/m3时，中毒的催化剂在停止通入SO2后其部分活性可以自行恢复，浓度>70 mg/m3过程中中毒的催化剂均为永久性失活。

关键词: 低温, 选择性催化还原, 制备方法, 烟气脱硝, 抗硫性能