Hydrodesulfurization of dibenzothiophen with MoO₃/TiO₂ catalyst

Mesoporous titania whiskers were used as MoO₃ hydrodesulfurization catalyst support. The novel support was impregnated with ammonium heptamolybdate [(NH₄)₆Mo₇ O₂₄·4H₂O] solution at different concentrations, and MoO₃/TiO₂ catalyst with different MoO₃ loadings was obtained. The catalyst was characterized by XRD, N₂ adsorption-desorption and SEM, the one with higher dispersion of MoO₃ was chosen for dibenzothiophene hydrodesulfurization. And the influences of reaction conditions and stability of MoO₃/TiO₂ catalyst on dibenzothiophene hydrodesulfurization of the chosen catalyst were tested in a fixed-bed reactor. Dibenzothiophene conversion rate could approach 100% under reaction temperature 280~300°C, hydrogen pressure 2.0 MPa, hydrogen/oil ratio 600 and LHSV 4 h^-1. Furthermore, there was no obvious evidence of deactivation of the catalyst after running for a long time of over 1000 h.