Cobalt molybdate catalyst with large specific surface area was prepared from cobalt(Ⅱ)chloride and ammonium molybdate with KIT-6 as hard template and alkali etching process.The morphology and structural of the catalyst were characterized by X-ray diffractometer,scanning electron microscope,X-ray photoelectron spectroscopy,and N2 adsorption-desorption techniques.Using cobalt molybdate as catalyst and O2 as oxidant,the catalytic oxidation of dibenzothiophene from simulated oil was studied.The effects of reaction temperature,O2 flow rate,the amount of catalyst addition and sulfide type on desulfurization efficiency were investigated.The results showed that the optimal reaction conditions were as follows:a simulated amount oil of 20 mL,an amount of catalyst of 0.05 g,an O2 flow rate of 200 mL/min,a reaction temperature of 110 ℃ and a reaction time of 60 min.Under this condition,the desulfurization rate could reach 96.2％,and the activity of the catalyst had not significantly decreased after 5 times of reuse.Mechanism studies showed that the formation of superoxide radicals in the presence of catalyst was the key to the high desulfurization activity of the catalyst.
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