Surface oxygen activation on CeO<sub>2</sub> and its catalytic performances for oxidation reactions

Abstract

The research and development of rare earth catalytic materials will greatly promote the high-efficiency use of abundant rare earth elements, such as La and Ce. Based on the excellent oxygen storage/release capacity of CeO2-based catalytic materials, they have been widely used in many oxidation processes. In this paper, the recent progress of theoretical research on CeO2-based materials was reviewed, including the oxygen vacancy formation/diffusion on CeO2, the promoter effect of the carrier CeO2 and the nature of high oxygen storage properties of cerium zirconium solid solution. Through the discussion of the effect of Ce 4f orbit, special electron structure and structural relaxation on the aspects above-mentioned, the reasons for high oxygen storage performance and high oxidation activity of CeO2-based catalytic materials have been revealed. Furthermore, the catalytic performances of CeO2-based catalysts for the catalytic combustion of methane and halogenated hydrocarbons and CO oxidation were reviewed, and the relationship between the redox properties of CeO2-based catalytic materials and their catalytic activity for these oxidations were discussed. Finally, the problems and development thinking for the CeO2-based catalysts are put forwarded and outlooked.