Catalytic CO oxidation on CeO2-based materials: Modification strategies, structure-performance relationships, challenges and prospects

Catalytic oxidation of carbon monoxide (CO) has gained increasing interest in recent years due to its promising applications. Cerium-based catalysts have been widely employed in CO oxidation processes due to their reversible oxygen storage/release capacity (OSC), excellent redox activity, and the most abundant rare earth element in the crust (46 ppm). However, conventional CeO₂ catalysts still face challenges of insufficient activity and poor stability. Herein, strategies to enhance the activity of CeO₂ catalysts are detailed, including crystal facet engineering, metal-support modification, and heteroatom doping. In conclusion, these strategies aim to increase the number of oxygen vacancies, optimize surface active sites, and strengthen the metal-support interaction, thereby significantly improving the activity of catalytic CO oxidation.