中文摘要：

采用凝胶溶胶法制备大比表面积的Al2O3载体,等体积浸渍法配制负载MnOx和CeO2组分的CeO2-MnOx催化剂.以NH3为还原剂,一定的空气流速及合适的气体配比的条件下,考察所制备的催化剂在70～300℃范围内低温SCR法的脱硝性能及机制,同时分别对催化剂进行BET、XRD、SEM等表征实验,研究催化剂的理化性质.结果表明,活性组分的负载量和焙烧温度对催化剂性能有很大的影响,适量CeO2的加入提高催化剂的活性及稳定性.在负载不同质量分数的MnOx/Al2O3催化剂中,7%MnOx/Al2O3显示了最大催化活性;添加CeO2可极大的改善MnOx/Al2O3中MnOx在载体表面的分散度,并提高其催化活性,4%的CeO2是MnOx/Al2O3最佳的添加量.实验结果还表明550℃为催化剂最佳的焙烧温度,这与MnOx形成不同的晶相有关,而CeO2的添加影响MnOx晶态,同时提出了催化剂催化还原NO的机制.

英文摘要：

The Al2O3,which has large specific surface area and is used as carrier,was prepared by sol-gel method in this study.Series catalysts of MnOx,CeO2 plus MnOx supported on Al2O3 by isometric impregnation method.The SCR denitrification experimental conditions were as follows：NH3 as reductive agent,certain gas velocity and suitable ratio of gas mixed was setup.Furthermore,the experiments of BET,XRD and SEM were also carried out respectively in order to obtain physicochemical properties of the prepared catalysts.The experimental results showed that the loading of active component and calcination temperature made a big difference to the catalysts＇ performance.With appropriate addition of CeO2,MnOx/Al2O3exhibits better activity and stability.For MnOx/Al2O3,the catalytic activity on NO was greatly influenced by its loaded content,and 7% MnOx/Al2O3 showed superior catalytic activity among the MnOx/Al2O3.The addition of CeO2 could greatly improve the dispersibility of MnOx on the carrier and increase its catalytic activity.The 4% CeO2 addition was the optimum loaded mass precent.Forthermore,550℃ is the best calcination temperature,as MnOx formed different crystalline phases with temperature,at the same time,the addition of CeO2 could affect MnOx crystalline phase.The catalytic mechanism of SCR on NO was also discussed.