Abstract: In this paper the intrinsic kinetics of TS-1 catalyzed epoxidation of propylene with hydrogen peroxide inmethanol/water is studied. The kinetic reaction is carried out in a semi-batch stirred-tank reactor at T=303.15～333.15 K,p=0.4～0.7 MPa.Four models from proposed mechanisms are regressed.The results obtainedshow that the Eley-Rideal mechanism fits the experimental data best.The Eley-Rideal mechanism Supported by the National Natural Science Foundation of China(No.29792070). To whom correspondence should be addressed.proposes that hydrogen peroxide molecule adsorbs on the catalytic sites and reacts with dissociated propylene molecule, and surface reaction is the rate-controlling step.Propylene oxide and propylene can also adsorb on the catalytic sites and compete with hydrogen peroxide, which hindes the epoxidation.Then, it is advisable to take propylene oxide out of the reactor to improve the reaction rate of epoxidation and prevent the side reaction of propylene oxide with the solvent(methanol).The adsorption of solvent methanol and water on the catalytic sites is complete under the reaction condition, so it does not affect the epoxidation rate.After parameter estimation and model discrimination, a rational model, which gives a good agreement with the experimental data, is obtained.The average relative deviation between experimental and calculated reaction rates is 12.5 %.roposesthathydrogenperox