Manganese catalysy supported on activated carbon fibers modified by nitric acid (MnOx/ACFN) was prepared by the method of impregnation. The activity of MnOx/ACFN catalyst was tested for selective catalytic reduction (SCR) of NO with ammonia at low-temperature. The effects of manganese content and the methods and content of cerium loading for improving the denitration activity of MnOx/ACFN catalyst were investigated. The physical and chemical characteristics of these catalysts were studied with X-ray diffraction (XRD) and scanning electron microscope (SEM). The most active catalyst with the highest conversion of NOx of 92.2%was prepared under the conditions of adding CeO2 by co-precipitation,total loading of MnOx and CeO2 15%,molar ratio of cerium to manganese 3∶2,reaction temperature 200 ℃.%以经过硝酸改性后的活性炭纤维（ACFN）为载体，采用等体积浸渍法制备了MnOx/ACFN催化剂。测试了其在以氨气为还原剂的低温选择性催化还原（SCR）过程中的催化活性，并考察了活性组分MnOx的负载量、金属氧化物CeO2的复合负载方法及负载量对催化剂脱硝活性的影响。同时运用XRD和SEM对催化剂理化特性进行表征。结果表明，采用共沉淀法添加CeO2、总负载量为15%、且铈与锰的物质的量比为3∶2、反应温度为200℃时，催化剂的活性最高，对NOx的去除率达到92.2%。
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