Removal Of Thiophenic Compounds In Gasoline By Catalytic Oxidation

In this paper, using silica gel as the carrier and Ni modified phosphorus heteropoly tungstic acid (HPW) as the main agent, the loaded catalyst for ultra deep desulfurization was prepared by the supersaturated impregnation method and characterized by SEM, ESCA, XRD, XRF and BET. Qualitative and quantitative analysis of sulfur compounds in fuel by potentiometric titration, GC-SCD and Antek9000. The effect of carrier, Nickel loading amount and modification methods on the catalyst performance was explored, respectively. The effect of the catalyst calcination temperature, the catalyst amount, the reaction time, the reaction temperature and the oxidant dose on the removal of alky1thiophene from the alkyl thiophene solution of normal octane and FCC gasoline, respectively, was investigated. Increasing the amount of catalyst and oxidant dosage, the desulfurization rate is increased firstly and then decreased, and the refined oil yield was decreased; with the increase of reaction temperature and reaction time, the desulfurization rate was increased, and oil refined yield was decreased; Research results show that the suitable conditions for the removal of alkyl thiophene were catalyst amount0.15g/50mL, oxidation dose0.3mL/50mL, reaction temperature60℃and reaction time3h. Under the above optimized conditions, the alkyl thiophene removal rate up to100%for model compounds and97.3%for FCC gasoline, respectively, was achieved, and the refined oil yield was no less than99%. Sulfur compound microstructure, solvent effect and reactivity were studied, respectively by density functional theory in Gaussian03programs.