An efficient Mn1-yCeyOx composite oxide mesoporous catalysts for catalytic combustion of aromatic hydrocarbon

Abstract

A simple and effective method, pyrolytic melt polymerization using solid metal salts, was successfully synthesized catalysts with a mesoporous structure. A series of high-performance composite oxide catalysts made from the manganese oxide was prepared. The characteristics of these materials were evaluated using various technologies, such as XRD, BET, H2-TPR, and in-situ DRIFTS. The catalytic combustion performance of catalysts for typical aromatic hydrocarbon (toluene and CB) was investigated. And we speculated the catalytic reaction path of toluene by in-situ infrared analysis. Based on T90%, the catalytic activity ranking was: Mn0.8Ce0.2Ox＞MnOx＞Mn0.5Ce0.5Ox＞Mn0.2Ce0.8Ox＞CeOx. Furthermore, Mn0.8Ce0.2Ox exhibited excellent catalytic stability in the CB and toluene for 20 h. The increase of oxygen vacancies was attributed to the doping of Ce which increased the amount of Mn3+ and Ce3+. The active oxygen and abundant oxygen vacancies on the Mn0.8Ce0.2Ox promote the good catalytic performance for aromatic hydrocarbons.