Oxidative Desulfurization of Model Gasoline Over Modified Titanium Silicalite

The oxidative desulfurization of model gasoline consisting of thiophene dissolved in n-octane was investigated with a series of modified titanium silicalite (TS) catalysts in presence of hydrogen peroxide and formic acid systems, and the reaction mechanism of the oxidative desulfurization of thiophene was preliminarily researched. The results showed that the copper modified TS was an active catalyst for thiophene oxidation while the other metal modified TSs were less active catalysts. When Cu-TS at a Cu/Si molar ratio of 0.015 was used as a catalyst for oxidation of model gasoline, the conversion of thiophene was 94.1% at 120 min. The conversion of thiophene was easily enhanced by increasing reaction time or reaction temperature, and reduced with addition of xylene and cyclohexene.