Study on the Green Preparation of Mesoporous MoO3/SiO2 by rice husk and Its Catalytic Performance in Oxidative Desulfurization
A series of mesoporous MoO3/SiO2 catalysts with different MoO3 loadings were prepared by an incipient-wetness impregnation meth-od using rice husk as both silica source and mesoporous template,and ammonium molybdate tetrahydrate as molybdenum source.The samples were characterized by XRD,UV-Vis,FT-IR and N2 adsorption-desorption isotherms techniques.The results showed that MoO3 is well dis-persed on the carrier SiO2 for samples with low MoO3 loadings;MoO3 crystals with orthorhombic phase begin to appear for samples with high MoO3 loadings.The samples had large specific surface area and obvious mesoporous structure.The catalytic performance of the samples was eval-uated by oxidative desulfurization reactions of dibenzothiophene(DBT)and 4,6-dimethyldibenzothiophene(4,6-DMDBT)model oils,and the suitable catalyst was screened to be 10％ MoO3/SiO2.Under the optimum reaction conditions,the conversions of both DBT and 4,6-DMDBT were 99.9％.
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