Modified Mesoporous HMS Supported V/W for Oxidative Desulfurization of Dibenzothiophene

This study examines the synthesis of two V/W-HMS (hexagonal mesoporous silica) compounds with various vanadium and tungsten loadings and their catalytic activities for oxidative desulfurization of dibenzothiophene (DBT) in the model diesel fuel. X-ray powder diffraction (XRD), scanning electron microscopy (SEM), Fourier transform infrared (FT-IR) spectroscopy and N-2 physical adsorption-desorption (BET/BJH) techniques were used to characterize these catalysts. According to our results, the best V/W-HMS catalyst exhibited high catalytic activity; it was capable of converting more than 95% of DBT in the model diesel fuel under the optimum reaction condition (0.05 g 1:4 of catalyst, T = 60 degrees C, t = 2 h). Doping of vanadium and tungsten led to a decrease in bandgap of the catalyst and an effective improvement in its catalytic performance. The catalytic activity remained unchanged even after 6 recycling processes. The reaction kinetics, mechanisms and bandgap energies of the catalysts were also investigated.

Automated summary

This study synthesized two V/W-HMS compounds with varying vanadium and tungsten loadings, and found that the optimal catalyst exhibited high catalytic activity in oxidative desulfurization of DBT in model diesel fuel. The doping of vanadium and tungsten lowered the bandgap of the catalyst, leading to improved catalytic performance, even after repeated use. The research also investigated the reaction kinetics, mechanisms, and bandgap energies of the catalysts.