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

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 °C) for ventilation air methane are very essential for utilization of the ventilation air methane. We mainly prepared catalysts CeO2/La2CoFeO6 and La2CoFeO6/CeO2 and comparative samples CeO2 and La2CoFeO6 by the simple sol-gel method and calcined them under 900 °C, and tested the catalytic performance of ventilation air methane combustion under the condition of 5 vol% H2O. The experimental results show that the light-off temperature (T10) and complete combustion temperature (T90) of the ventilation air methane combustion reaction of CeO2/La2CoFeO6 catalyst are 417.4 and 587.7 °C, respectively. T10 and T90 of La2CoFeO6/CeO2 only reach 425.5 and 615.8 °C. The T10 and T90 of CeO2/La2CoFeO6 are 417.4 and 587.7 ℃, which are lower than those of La2CoFeO6 (T10 = 452.4 ℃ and T90 = 673.0 ℃) and La2CoFeO6/CeO2 (T10 = 425.5 ℃ and T90 = 615.8 ℃). Therefore, the catalytic performance of the anti-supported rare earth oxide catalyst CeO2/La2CoFeO6 is better than that of La2CoFeO6 and supported catalyst La2CoFeO6/CeO2. Double perovskite anti-supported rare earth oxide catalyst CeO2/La2CoFeO6 shows properties of the improving of the amount of the surface lattice oxygen and the desorption oxygen and the transformation of the ionic valence states, which enhance the catalytic activity for the ventilation air methane combustion. [Display omitted] •Double perovskite anti-supported catalyst CeO2/La2CoFeO6 was prepared.•CeO2/La2CoFeO6 shows the optimal catalytical activity for VAM combustion.•CeO2/La2CoFeO6 shows a better stability in water atmosphere.•Fe3+, Fe2+, the surface lattice and the desorption oxygen are main active species.•Mössbauer also has some novelty in the characterization of catalysts.