Preparation of C₉H₁₀O₂-0.5ZnCl₂/Al₂O₃ and its oxidative desulfurization performance

A C₉H₁₀O₂-0.5ZnCl₂/Al₂O₃ catalyst was successfully prepared by immobilizing phenylpropionic acid-zinc chloride(C₉H₁₀O₂-0.5ZnCl₂) double acid deep eutectic solvent on Al₂O₃, and analyzed by XRD, FT-IR, SEM, EDS and N₂ adsorption-desorption. The removal activity for aromatic sulfides in model oil using C₉H₁₀O₂-0.5ZnCl₂/Al₂O₃ as catalysis and H₂O₂ as oxidant and the effect of some reaction parameters such as temperature, catalyst dosage, O/S molar ratio and different sulfide types on the desulfurization activity of catalyst were investigated. The experimental results show that with the model oil of 5 mL, the catalyst dosage of 0.2 g and the O/S molar ratio of 8, at temperature of 60℃and reaction time of 180 min, the removal rate of DBT can reach to 99.2%. In addition, the catalyst can be recycled up to 6 times with a little decrease in catalytic activity for the ODS process. The catalysis-oxidation desulfurization mechanism of C₉H₁₀O₂-0.5ZnCl₂/Al₂O₃ was also explored.