Synthesis of Mesoporous Manganese Oxide Catalysts and Their Catalytic Oxidation Properties of Toluene
In this study,ordered mesoporous manganese oxide(m-MnOx)catalyst was prepared by SBA-15 template method,and its catalytic activity for oxidation of toluene was evaluated.Compared with MnOx without ordered mesoporous structure,m-MnOx exhibit excellent catalytic performance(T90=235 ℃ vs.T90＞300 ℃),lower apparent activation energy(Ea=55.94 kJ/mol),better catalytic stability and water resistance.The characterization results of XRD,TEM,XPS,H2-TPR and O2-TPD indicate that the enhancement of catalytic performance of m-MnOx is mainly due to its internal ordered mesoporous structure with good thermal stability.The ordered mesoporous structure greatly increases the specific surface area of the catalyst,while reducing the crystallinity of the catalyst,resulting in more Mn3*species and oxygen vacancy content on the surface,enhancing the low temperature reducibility of the catalyst,and thus enhancing the catalytic performance of m-MnOx for toluene oxidation.
万方数据
维普
