Study on Combustion Performance of Mn-Based Binary Carrier Catalyst for Ventilation Air Methane

摘要

La-Al2O3 and Ce-Al2O3 binary monolithic column materials with dual functions of carrier and promoter were prepared in one-step by the sol-gel method.Using the as-synthesized binary monolithic column materials as carrier,the 9%Mn/M-Al2O3(M=La/Ce)catalyst was prepared by the impregnation method.The binary carrier and catalyst were characterized by BET,SEM,XRD,H2-TPR,and O2-TPD techniques,and the methane combustion performance was tested in a micro fixed-bed reactor.Results showed that the Mn-based binary carrier catalyst with dual functions of carrier and promoter had higher catalytic activity than that with single alumina acting as the carrier.The catalyst activity gradually increased with an increasing content of La,while there was no significant effect with the increase in Ce content.When the ratio of La content in La-Al2O3 is 11%,1%of methane contained in the ventilation air can be completely converted over the 9%Mn/11%La-Al2O3 catalyst at a temperature as low as 550℃.