Research progress of the preparation of perovskite oxide catalysts and their catalytic performances for soot combustion

Soot particles derived from the exhaust of diesel engines is one of the main sources of urban haze, which seriously pollute the environment and endanger people’s health. It is one of the most effective ways to eliminate soot particles by catalytic purification technology. In this way, the design and development of the catalysts with excellent performances is the most critical factor to determine whether this technology can be widely applied. Recently, perovskite oxide catalysts have been become a research hotspot in the catalytic combustion of soot particles due to the advantages of high activity, low costs and high stability. This review focuses on summarizing the preparation methods of perovskite oxide catalysts commonly used in recent years, such as sol-gel method, template method, coprecipitation method, hydrothermal synthesis method, and solid-state synthesis method. Meanwhile, perovskite catalysts with high activities for the soot catalytic combustion, such as Co-based perovskite, Mn-based perovskite, Fe-based perovskite, Ti-based perovskite, are also elaborated in detail. Moreover, the future research and development directions of perovskite oxide catalysts for the diesel soot catalytic combustion are prospected.