Abstract: n%-Ni-MoO₃/SG（n＝2.0，5.0，7.0） catalyst was synthesized by sol-gel method using Ni-MoO₃ as active component and silica gel (SG) as carrier. The structure of the catalyst was characterized by Fourier transform infrared spectrum(FT-IR），X-ray diffraction(XRD)，scanning electron microscope(SEM），N₂ adsorption-desorption，and X-ray photoelectron spectroscopy(XPS). The removal of dibenzothiophene(DBT） from simulated oil was studied with Ni-MoO3/SG as catalyst，H2O2 as oxidant and acetonitrile as extractant. The effects of active component loading，reaction temperature，amount of catalyst，oxygen-sulfur molar ratio （O/S），addition amount of extractant，and types of sulfides on desulfurization were investigated. The experimental results showed that the sulfur removal rates of the simulated oil of DBT，4，6-dimethyldibenzothiophene （4，6-DMDBT） and benzothiophene(BT) were 99.4%，93.6%，and 99.1% ,respectively, under the optimal reaction conditions, and the sulfur removal rate of the simulated oil of DBT could still reach 93.7% after 5 times recycling.

Key words: Ni-MoO₃/SG, extractive oxidative desulfurization, dibenzothiophene, sol-gel method