Abstract: In this paper,an experimental study on the reaction kinetics of the CO₂ splitting by ceria was operated using sheet-ceria materials. Comparing the experimental results with different gas-solid models,the homogeneous F1.5 model was selected as the best model that could describe the CO₂ splitting by ceria at high temperature. The model selection method was validated using the Hancock and Sharp model-free method,and finally the reaction kinetic constants of the reaction process were obtained,providing guidance for the utilization of ceria in the solar thermochemical cycle.