Highly efficient mesoporous WO x /KIT-6 catalysts for oxidative desulfurization of dibenzothiophene with hydrogen peroxide

摘要

Oxidative desulfurization (ODS) of organic compounds containing sulfur element from a model oil was performed using tungsten oxide catalysts supported on mesoporous silica with cubic Ia 3 d mesostructure, well-defined mesopores (7.2?nm), high surface area (719?m_(2)/g), and three-dimensional pore network (WO~( x )/KIT-6). The prepared WO~( x )/KIT-6 catalysts (5–20?wt% WO~( x )) were characterized by X-ray diffraction analysis, N~(2)sorption measurements, electron microscopy, H~(2)-temperature programmed reduction, Raman spectroscopy, and thermogravimetric analysis. Among the mesoporous catalysts, 10?wt% WO~( x )/KIT-6 exhibited the best catalytic performance. Sulfur-containing organic compounds, such as dibenzothiophene, 4,6-dimethyldibenzothiophene, and benzothiophene, were completely (100?%) removed from the model oil over 10?wt% WO~( x )/KIT-6 catalyst in 2?h. In addition, the catalyst could be reused several times with only slight decrease in catalytic activity.