Catalytic oxidative desulfurization of dibenzothiophene using catalyst of tungsten supported on resin D152

In this paper, the performance of catalytic oxidative desulfurization (ODS) were studied using catalyst W/D152 which was prepared by depositing tungsten on resin D152, a macroporous polyacrylic cationic resin. Dibenzothiophene (DBT) was selected as the target compound, and oil-soluble cyclohexanone peroxide (CYHPO) as an oxidant. The effect of different reaction parameters, including reaction temperature, reaction time, the weight of catalyst W/D152 and the molar ratio of CYHPO/DBT were investigated, and the oxidation mechanisms as well as the kinetics were also examined individually. The conversion of DBT and the sulfur content reached 99.1% and 3.52 ppm, respectively at the optimal catalytic conditions of 100 °C, mass ratio of model gasoline to catalyst W/D152 of 100, molar ratio of CYHPO/DBT of 2.5 and reaction time of 40 min. The catalyst could be reused for 7 times before the total sulfur content of treated model gasoline was higher than 10 ppm. The catalytic oxidation of DBT fitted the first-order kinetic model pretty well. The catalyst W/D152 was analyzed by the scanning electron microscopy (SEM) and Fourier Transform Infrared Spectroscopy (FTIR), and the data show that a thin layer of active components was covered on the catalyst surface which helps explain the satisfactory catalytic performance.