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中文摘要：
基于NH3-SCR低温活化反应模型，通过对催化剂表征参数和负载量进行评估分析，得出了MnOx-CeO2／ACF型催化剂低温活化和反应稳定最佳的CeO2与MnOx配比率；利用25％MnOx-5％CeO2／ACF、25％MNOx-15％CeO2／ACF、25％MnOx-25％CEO2／ACF和25％MnOx-30％CeO2／ACF共4种低温催化剂试样，在发动机排放试验台架上进行了NOx转化率、NH3存储．释放和排放测试等特性试验．结果表明，在20～250℃温度下，25％CEO2．25％MnOx／ACF型催化剂的NOx平均转化效率和转化波动率分别为88．7％和0．5％，验证了该催化剂低温活化和反应稳定性最好，达到了国Ⅳ排放法规催化还原柴油机NOx的限值要求．
英文摘要：
Based on the active reaction models of NH3, the characteristic parameters of the catalysts, including a specific surface area, pore volume, oxygen storage capacity and metal load, were evaluated at low temperature, and the optimal mixed ratio of CeO2 and MnOx was then obtained by optimizing the load distributive ratio in order to achieve the best low-temperature active and reaction stability of MnOx-CeO2/ACF catalyst. By using four kinds of low-temperature catalyst, 25% MnOx-5% CeO2/ACF, 25% MnOx-15% CeO2/ACF, 25% MnOx-25% CeO2/ACF and 25% MnOx-30% CeO2/ACF, the characteristic tests were carried out to study NOx conversion efficiency, NH3 stor- age - release rate and the testing emissions of diesel engine with urea-SCR technology in the diesel engine test bench. The test results show that the average conversion efficiency and fluctuant rate of NOx for 25% CEO2-25% MnOx/ACF catalyst are accordingly 88.7% and 0.5%, respectively, when the reaction temperature is 20--250℃, verifying that 25% CEO2-25% MnOx/ACF has the best low-temperature catalyst activity and catalytic stability, which meets the NOx emission limited criterion for diesel engine of national VI emissions regulations.
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