The effects of the regeneration temperature and sulfur dioxide concentration on the regeneration behavior of modified semi coke supported (Fe, Zn, Ce) sorbent were investigated using a fixed bed reactor and a thermogravimetric analyzer in the present work. Regeneration kinetic studies were also performed at regeneration temperatures of 650-750 degrees C. The results show that the optimum regeneration temperature and SO2 concentration are 700 degrees C and 12 vol%, respectively. The reaction order of regeneration with respect to SO2 is first-order. The equivalent grain model can be effectively used to correlate with the. experimental data. In the early stage of reaction (x < 35%), the regeneration is controlled by the chemical reaction, while it is controlled by the diffusion through the product layer in the latter stage (x > 85%). According to the model, the apparent activation energy and the corresponding frequency factor of the chemical reaction are 12.45 kJ/mol and 0.255 m/s, vs 27.08 kJ/mol and 1.05 x 10(-4) m(2)/s for the diffusion reaction. The chemical reaction, ZnS + FeS + CeS2 + 6SO(2) -> ZnFe2O4 + CEO2 + S-x, for regeneration oyer our sorbent are obtained according to the XPS and XRD results.