Oxidation-extraction desulfurization of model oil over Zr-ZSM-5/SBA-15 and kinetic study

ZSM-5/SBA-15 composite molecular sieves were synthesized using post-synthesis method and characterized by X-ray diffraction and N2 adsorption-desorption. The oxidative-extration desulfurization of model oil was investigated by using hydrogen peroxide as the oxidant, tetrabutyl ammonium bromide as phase transfer catalyst, dimethyl sulfoxide as extractant, and Zr-ZSM-5/ SBA-15, Ag-ZSM-5/SBA-15, Ce-ZSM-5/SBA-15 as catalyst. Under the optimal conditions, the desulfurization rate decreases in the order： Zr-ZSM-5/SBA-15 〉 Ce-ZSM- 5/SBA-15 〉 Ag-ZSM-5/SBA-15. The highest desulfuriza- tion rate is 84.53% under the catalysis of Zr-ZSM-5/SBA- 15. Kinetics analysis shows that the reaction is pseudofirst-order with the activation energy of 44.23 kJ/mol.