LaMn_1-yCu_yO₃催化剂对苯乙烯催化燃烧的性能研究

Study on the Catalytic Combustion of Styrene with LaMn_1-yCu_yO₃ Catalyst

本文采用溶胶凝胶法制备了改性钙钛矿催化剂LaMn1?yCuyO3 (y = 0, 0.1, 0.2, 0.3, 0.4, 0.5),结合XRD、BET、XPS和H2-TPR表征手段研究了在Mn3+位掺杂不同量的Cu对钙钛矿型催化剂LaMnO3 (y=0, 0.1, 0.2, 0.3, 0.4, 0.5)的物理化学性质的影响,并考察了其催化燃烧苯乙烯的催化性能。在LaMnO3催化剂中掺杂Cu会改变催化剂的晶体结构,使催化剂的比表面积减小,Mn原子的价态发生转变。H2-TPR的结果表明在LaMnO3钙钛矿催化剂中掺杂Cu能显著提高催化剂的低温氧化还原性能,当y = 0.4的时候,催化剂的低温氧化还原性能最好。LaMnO3催化剂中掺杂Cu能提高催化剂的催化燃烧苯乙烯的性能,其中LaMn0.6Cu0.4O3 (y = 0.4)催化剂催化燃烧苯乙烯的效率最高,T50和T90分别为290℃和308℃。

In this paper, modified perovskite catalyst LaMn1?yCuyO3 (y = 0, 0.1, 0.2, 0.3, 0.4, 0.5) was prepared by sol-gel method. The catalytic combustion performance of the modified perovskite catalyst LaMnO3 (y = 0, 0.1, 0.2, 0.3, 0.4, 0.5) was investigated, and the physical and chemical properties of perovskite catalyst LaMnO3 were studied by means of XRD, BET, XPS and H2-TPR characterization. Doping Cu in LaMnO3 catalyst will change the crystal structure of the catalyst, reduce the specific surface area of the catalyst, and modify the valence state of Mn atoms. The results of H2-TPR showed that doping Cu in LaMnO3 perovskite catalyst could significantly improve the low-temperature redox performance of the catalyst. When y = 0.4, the low-temperature redox performance of the catalyst was the best. Doping Cu in LaMnO3 catalyst can improve the catalytic combustion perfor-mance of styrene, among which LaMn0.6Cu0.4O3 (y = 0.4) catalyst has the highest catalytic combus-tion efficiency of styrene, T50 and T90 are 290?C and 308?C respectively.