Oxidative desulfurization of dibenzothiophene via layered graphitic carbon nitride-coordinated transition metal as a catalyst

In this study, graphitic carbon nitride (g-C3N4) has been synthesized. The cobalt-doped (CoO/g-C3N4) samples prepared by the impregnation method and their catalytic property were investigated on the ODS process. The structure and components of the prepared samples were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), nitrogen adsorption-desorption (BET), and Fourier-transform infrared (FT-IR) spectroscopy. The parameters, such as the reaction temperature, oxidant dosage, amount of catalyst, different cobalt contents loaded (5, 15, 30, 45, and 60 wt%), and reaction time, were optimized by the Taguchi method. Results demonstrated that under the optimal condition (65 degrees C, 0.05 ml oxidant, 0.06 g catalyst, 45% of cobalt loading, and 80 minutes), the conversion reached 86.7%. Besides, it revealed that cobalt contents loaded are the most effective parameters in the ODS process. In addition, the efficiency decreased sharply by adding cyclohexanone, which demonstrated that it has a strong negative effect on efficiency. Finally, a reaction mechanism for the catalytic oxidation of DBT in the presence of CoO/g-C3N4 was proposed.

Automated summary

Graphitic carbon nitride (g-C3N4) was synthesized and used in the ODS process with cobalt doping (CoO/g-C3N4) to investigate its catalytic properties. The study found that the cobalt content loaded in the catalyst had the most significant impact on conversion efficiency, while the addition of cyclohexanone negatively affected efficiency.