MOFs-derived LaMnxFe1-xO3 perovskite oxides as efficient catalysts for methane oxidation

Abstract

The design and development of highly efficient catalysts are essential for the removal of air pollutants through catalytic oxidation. In this study, the structural and surface properties of LaFeO₃ perovskite oxides were effectively tailored using a dual strategy involving MOF-assisted synthesis and Mn doping, resulting in significantly enhanced CH₄ oxidation activity. Among the investigated catalysts, LaMn_0.1Fe_0.9O₃-SG exhibited the best catalytic performance, achieving T₅₀ and T₉₀ values of 495 and 577 °C, respectively. Comprehensive characterization revealed that the enhanced catalytic activity is primarily attributed to the increased specific surface area generated by the MOF-assisted synthesis strategy, which provides more accessible active sites for CH₄ adsorption and activation. In addition, Mn doping modifies the surface electronic structure, leading to the formation of abundant lattice oxygen species and enhancing oxygen activation and mobility through the Mars–van Krevelen (MvK) mechanism. The synergistic effects of the MOF-assisted synthesis strategy and Mn doping effectively regulate the structural and surface properties of the perovskite oxides, resulting in superior catalytic performance. This study provides an effective strategy for the rational design of high-performance perovskite catalysts for environmental catalytic applications.