Double perovskite anti-supported rare earth oxide catalyst CeO₂/La₂CoFeO₆ for efficient ventilation air methane combustion

Xiaojiao Gao，Zehua Jin，Ruisheng Hu，Jia’nan Hu，Yaqin Bai，Pan Wang，Jie Zhang，Chunxiao Zhao

Key Laboratory of Coal Chemistry,School of Chemistry and Chemical Engineering,Inner Mongolia University

摘 要：Ventilation air methane is one of available resources with a massive reserve.However,most of ventilation air methane is discharged into the air and pollutes the environment.Catalysts with high temperature resistance（>800℃） for ventilation air methane are very essential for utilization of the ventilation air methane.We mainly prepared catalysts CeO₂/La₂ CoFeO₆ and La₂ CoFeO₆/CeO₂ and comparative samples CeO₂ and La₂ CoFeO₆ by the simple sol-gel method and calcined them under 900℃,and tested the catalytic performance of ventilation air methane combustion under the condition of 5 vol% H₂ O.The experimental results show that the light-off temperature(T₁₀) and complete combustion temperature(T₉₀) of the ventilation air methane combustion reaction of CeO₂/La₂ CoFeO₆ catalyst are417.4 and 587.7℃,respectively.T₁₀ and T₉₀ of La₂ CoFeO₆/CeO₂ only reach 425.5 and 615.8℃.The T₁₀ and T₉₀ of CeO₂/La₂ CoFeO₆ are 417.4 and 587.7℃,which are lower than those of La₂ CoFeO₆(T₁₀=452.4℃and T₉₀=673.0℃) and La₂ CoFeO₆/CeO₂(T₁₀=425.5℃ and T₉₀=615.8℃).Therefore,the catalytic performance of the anti-supported rare earth oxide catalyst CeO₂/La₂ CoFeO₆ is better than that of La₂ CoFeO₆ and supported catalyst La₂ CoFeO₆/CeO₂.

关键词：