Study On The Oxidative Desulfurization Of Benzothiophene In Pickering Emulsion

In order to reduce pollution of sulfur compounds for the environment, various countries have introduced regulations to limit the sulfur content, which requests to produce and use the environmentally friendly ultra-low sulfur oil. Oxidation desulfurization, as a new desulfurization technology, because of mild reaction condition and no expensive hydrogen involving, has moved widely in favour of the researchers. Especially for the oil with high steric hindrance, it displays higher oxidative activity.Pickering emulsion is a stable disperse system in the aspect of thermodynamics and dynamics, which can replace the traditional chemical emulsifier. Because of its low cost, non-toxic and environmental protection, it has application value on food, catalysis and cosmetics. This paper, based on solid particles as emulsifier to prepare Pickering emulsion, has investigated the infection factors of the formation and stabilization in Pickering emulsion system and the performance on catalysis in phase boundary.We have used direct precipitation to preparate ZnO particles and made MoO3/ZnO, HsPW12O40/ZnO, MoO3/talc and H3PW12O40/talc composite particles with impregnation method. SEM test showed that the needle structure of ZnO particles is not obvious and its average particle size was5μm; MoO3with sheets dispersed evenly on ZnO surface and average particle size was30μm; H3PW12O40with needles dispersed evenly on ZnO surface and average particle size was15μm; Talcum powder had obvious flake structure. FTIR test indicated that, talcum powder particles, MoO3/talc and H3PW12O40/talc composite particle surface had a lot of hydroxyl. MoO3exited mainly by eight coordination form and equably dispersed in talcum powder surface. H3PW12O40still kept Keggin uniform structure and distribution equably on talcum powder surface. XRD proved the infrared spectrum analysis. The MoO3/ZnO, H3PW12O40/ZnO, MoO3/talc and H3PW12O40/talc composite particles, as emulsifier, was made the O/W type of Pickering emulsion respectively. And we also study the factors of varieties of particles and oil and water volume ratio on Pickering emulsion.We do research the process of oxidation-extraction desulfurization in Pickering emulsion system with MoOs/talc and H3PW12O40/talc as emulsifier, using n-octane and water as two phases. The benzothiophene was oxidised and extracted by equal volum of DMF with hydrogen peroxide as the oxidant in mild conditions. In this system, it contained catalysts, water phase and oil phase. According to the experiments, the catalysts showed high catalytic oxidative activity. When the O/S molar ratio reached at6, it can prove to be sulphone. The results demonstrate that the sulphone can be separated by DMF and the content of sulfur can be reduced from255μg/mL to1μg/mL.We also do research the process of oxidation-extraction desulfurization in Pickering emulsion system with MoO3/talc and H3PWO40/talc as emulsifier, using n-octane and DMF as two phases. It can be oxidized directly with hydrogen peroxide as the oxidant in mild conditions. The study found that it expressed high catalytic oxidative activity in condition of T=50℃and t=90min, which the desulfurization degree can be achieve at89%and the content of sulfur can be reduced from255μg/mL to28μg/mL.