Research Advances and Challenges in Catalytic Oxidation of CO Using Rare Earth-based Perovskite Oxides

Carbon monoxide (CO) is one of the primary air pollutants generated during industrial production. As environmental regulations in China continue to tighten and emission standards become increasingly stringent, the effective removal of CO has gained significant importance. Catalytic oxidation based on perovskite oxides (ABO₃) represents a highly promising CO removal technology, with the development of high-performance perovskite catalysts being a critical factor in enhancing its efficiency. Rare-earth elements, owing to their unique 4f electronic configuration, moderate valence states, and ionic radii, play a critical role in modulating the CO catalytic oxidation performance of perovskite materials and modulating the redox properties of B-site transition metals, thereby significantly influencing the CO catalytic oxidation performance. This review summarizes the common preparation methods of rare earth-based perovskite oxide materials and the mechanisms for regulating catalytic performance of rare-earth-based perovskites through strategies including A/B-site doping, surface engineering, and morphology control, while analyzing the intrinsic correlations between rare-earth elements and the material′s electronic structure, oxygen mobility, and stability. Furthermore, to address the critical challenge of sulfur-induced catalyst deactivation in practical applications, this work discusses the interaction mechanisms between active components and sulfur species. Thereby offering theoretical insights and technical guidance for the development of advanced rare earth-based perovskite catalytic materials that exhibit both high catalytic activity and strong resistance to sulfur poisoning.