چكيده به لاتين
According to international standards, the sulfur of fuels used in the transport sector, as one of the most important sources of pollution, should be reduced to around 10 ppmw by 2010. The main reason for ultra-deep desulfurization is environmental problems such as air pollution, acid rain, and the concerns for human health. Oxidative desulfurization (ODS) is a supplement to the hydrodesulfurization (HDS) process. In Oxidative desulfurization process, desulfurization of refractory sulfur compounds was carried out under mild operation conditions (low temperature and low pressure). In this study, the performance of catalytic oxidative desulfurization was considered using tungsten-vanadium catalysts supported on alumina with different compositions of tungsten (W) and vanadium (V), which were synthesized by incipient wetness impregnation. The effects of different reaction parameters including reaction temperature, reaction time, the amount of catalyst, the molar ratio of O/S, and aromatic, nitrogen, as well as olefins competetive coumponds were investigated. The conversion of DBT for 3wt.% V-17wt.% W, as the best catalyst, was reached 100% at the temperature of 80℃, mass ratio of model fuel/catalyst=100, molar ratio of O/S=5, and reaction time=5 min. Reducing the reaction temperature reduces the activation energy and thus reduces the percentage of desulfurization. The presence of competitive compounds also reduced the conversion of desulfurization to 87%, 84% and 71%, in the presence of quinoline, indole and cyclohexene, respectively. The catalysts were characterized by the FTIR, XRD, N2 adsorption-desorption, and FESEM. The data helps explaining the satisfactory catalytic performance.
