Abstract:

SiO2 was synthesized through self-assembly method and the effect of different synthesis conditions on the pore structure and oxidative desulfurization were investigated including the concentration of silica source, the dosage oftemplate and the period of aging. The supported catalysts were synthesized by incipient impregnation method with the SiO2 as support, and then modified by the introduced citric acid (CA), Ce(NO3)3?6H2O and La(NO3)3?6H2O, respectively. A series of the modified catalysts were applied to catalytic oxidative desulphurization reaction to evaluate their performance with H2O2 as oxidantand then the reactionconditions on catalytic oxidative desulphurization of VGO were investigated. The results are that the best synthesis conditions of SiO2 are concentration of silica source of 0.68 mol/L, [CTAB]/[TEOS] of 0.22 and aging time of 2 h; The order of desulfurization performance is Ce-MoO3/SiO2＞CA-MoO3/SiO2＞MoO3/SiO2＞La-MoO3/SiO2; The desulfurization rate of VGO is 64.8% with Ce-MoO3/SiO2as catalystunder the optimal conditions (the temperature of 70 ℃,nO/nS of 8,the timeof 2 h, the dosage of catalyst of 15wt%).

Key words: molybdenum, SiO2, modification, oxidative desulfurization, vacuum distillate