The Application Of Fluorinated Resin And Conducting Polyaniline In Photocatalytic Oxidation Desulfurization Of Diesel Oil

The environmental crisis which is caused by the heavy industry is more severe, especially for the air. The vehicle exhaust emissions can also aggravate the air pollution. All of these can result in acid rain and hazy weather and this is an threat for people.All these reason have forced us to take the protection of the environment more seriously and raise the standard of the sulfur content in the fuel oil. The application of the traditional HDS is limited for its disadvantage, such as the high energy consumption and the tough operating conditions. The photocatalytic oxidation desulfunzation which take oxygen as oxidant is a low energy consumption and environment-friendly technology. Macroporous resin as the carrier of the active component can improve the loading capacity of the composite catalyst and it can be easily modified for specific purpose. Conducting polymer can be applied to the photocatalyst and contribute to the improvement of the catalytic activity because of its unique structure which can restrain the recombination of e- and h+Fluorinated polystyrene is synthesised and as the carrier of phosphotungstic acid to form composite catalyst according to incipient impregnation, and the content of phosphotungstic acid is 5wt%、7.5wt%.10wt%、12.5wt% and 15wt% respectively.The structure of the fluorinated polystyrene and the surface morphology of the composite catalyst is characterized by FT-IR SEM and XRD. The relationship between the desulfurization rate and the reaction temperature as well as the reaction time is investigated by the photocatalytic oxidation desulfurization experiment. The results show that at 90 degrees centigrade, oxygen as the oxidant, the desulfurization rate of the diesel oil is up to 61.52% for 2h irradiation by high pressure mercury lamp when oxygen velocity is 150mL/min. The desulfurization rate of the diesel oil can be raised to 68.55% when 90% N-methyl-2-pyrrolidone is added during the reaction and the other conditions are not changed. Another two control experiment are conducted which show that both UV-irradiation and fluorine modification can improve the desulfurization rate.PANI/TiO2 composite nano-particles are prepared by the chemical oxidation method to catalyze the desulfurization of the diesel oil. FT-IR SEM and XRD is used to characterize the structure and the surface morphology of the composite catalyst. A series of experiments is conducted to evaluate the optimum condition, the results show the best condition is the oxygen flow rate is 150mL/min, the ratio of extractant to oil is 1. The desulfurization rate is raised as time goes on. The desulfurization rate is 56.81% when the reaction time is 3h.A series of composite catalyst (TiO2/PANI) are prepared and characterized by XRD and SEM. The influence of the ration TiO2/PANI and the reaction time to the performance of the catalyst is studied. The results show that the desulfurization rate of the diesel oil is 57.85% for 3h irradiation by high pressure mercury lamp when oxygen velocity is 150mL/min and the mass ratio of PANI/TiO2 is 10.