不同前驱物制备的MnOx/TiO2联合O3催化氧化NO性能

摘要

分别以乙酸锰(MnAc)、氯化锰(MnCl2)和硝酸锰(Mn(NO3)2)为前驱物,采用浸渍法制备MnAc/TiO2、MnCl/TiO2和MnN/TiO2三种催化剂,并采用氮吸附、SEM、H2-TPR、O2-TPD、XRD和XPS进行表征.在固定床反应器上研究了三种催化剂的联合臭氧催化氧化NO性能.结果表明,以乙酸锰为前驱物制备的MnAc/TiO2催化剂联合臭氧催化氧化NO活性最高;MnAc/TiO2催化剂颗粒分散性好,比表面积相对较大,催化剂表面Mn3+较多,因而具有较高的催化活性.%MnAc/TiO2,MnCl/TiO2 and MnN/TiO2 were prepared by impregnation method using manganese acetate (MnAc),manganese chloride (MnCl2) and manganese nitrate (Mn(NO3)2) as precursors,respectively.These catalysts were characterized by SEM,N2 physisorption,H2-TPR,O2-TPD,XRD and XPS;their catalytic performance in the oxidation of NO with ozone (O3) was investigated in a fixed bed reactor.The results illustrate that the MnAc/TiO2 catalyst with manganese acetate as the precursor exhibits the highest activity among three catalysts,which is ascribed to its highly dispersible particles,large surface area and high content of surface Mn3+.