Oxide-Type Materials for Catalytic CO2 Methanation: Recent Advances and Future Perspectives
摘要
Carbon dioxide (CO2) methanation, also known as the Sabatier reaction, is a promising strategy for mitigating greenhouse gas emissions while enabling the storage of renewable hydrogen in the form of methane. However, achieving high catalytic activity, selectivity, and long-term stability under industrially relevant conditions requires the development of catalysts with tailored structural and functional properties. Conventional catalysts based on Ni, Ru, and Rh have demonstrated considerable performance in CO2 methanation. Nevertheless, challenges associated with high-temperature catalysis such as thermal degradation, carbon deposition (coking), and the high cost of noble metals still remain. To address these issues, oxide-type materials have attracted increasing attention due to their multifunctional roles not only as catalyst supports but also as active materials in the catalytic process. Simple oxides such as Al2O3, SiO2, CeO2, and ZrO2, as well as more structurally complex oxides such as perovskites (e.g., LaNiO3, SrTiO3) and spinels (e.g., MgAl2O4), can significantly influence metal dispersion, reducibility, and metal–support interaction strength. As a result, these characteristics critically affect both catalytic performance and durability of CO2 methanation. Moreover, many oxides actively participate in the reaction mechanism by facilitating oxygen vacancy formation, hydrogen spillover, and dynamic redox behavior, making them essential components in the design of next-generation CO2 methanation catalysts. This review summarizes recent progress in oxide-type materials for catalytic CO2 methanation and highlights material design strategies aimed at developing catalysts with high activity, selectivity, and durability.