锰基尖晶石催化剂的脱硝活性与抗碱性能的研究

Research on the Denitration Activity and Alkali Resistance of Mn-based Spinel Catalysts

采用浸渍法制备了一系列0.20M-Mn/TiO_2(M=Cu、Co、Ni)低温脱硝催化剂,并对这些催化剂进行了XRD、H_2-TPR、XPS、原位红外、NH_3-SCR性能等测试。实验结果表明,锰基尖晶石(CuMn_2O_4、CoMn_2O_4、NiMn_2O_4)的形成是催化剂的性能提升的重要因素。锰基尖晶石催化剂一方面能增加Lewis酸位点和氧化还原位点,另一方面能够阻止碱与其反应,因而这类催化剂也具有较好的抗碱中毒能力。

A series of 0.20 M-Mn/TiO2(M= Cu,Co,Ni)catalysts for denitration at low temperature were prepared with the impregnation method,and catalysts were characterized with XRD,H2-TPR,XPS,and in situ diffuse reflectance infrared transform spectroscopy(DRIFT),as well as the activity evaluation of NH3-SCR.The experimental results indicate that the formation of Mn-based spinels(CuMn2O4,CoMn2O4,and NiMn2O4)is the key factor in the promotion of catalyst activities.Meanwhile,Mn-based spinels can not only increase the Lewis sites and redox sites,but also prevent themselves form reacting with the alkali.Therefore,this kind of catalysts also show excellent alkali resistance.