Effects of carrier on supported rare earth double perovskite oxide catalysts for catalytic combustion of methane

摘要

Supported rare earth double perovskite (La_2MnNiO_6) oxide catalysts were prepared by incipient wet impregnation method for methane catalytic combustion, and effects of the support (Al_2O_3, ZrO_2 and MgO) were investigated. The loaded catalysts were characterized by means of XRD, TPR, SEM techniques and their catalytic activities were tested by complete methane oxidation. Depending on the different oxide carrier (e.g. Al_2O_3, MgO and ZrO_2), catalysts have different catalytic properties, because the interaction of metal oxide-support will affect both redox property and dispersity of the active phase. The results on catalysts have shown that the dispersion on Al_2O_3 and MgO supports had an effect to enhance the catalytic performances of the catalysts that had been treated at 1100°C. The activity of ZrO_2 supported catalyst significantly decreases when calcination temperature at is 1100°C. The dispersity of the active phase and the nature of the oxide carrier played an important role in the catalytic performance.