Hydrodesulfurization Reaction on CoMo Catalysts: Effect of Preparation Method

概要

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Hydrodesulfurization of dibenzothiophene (HDS of DBT) has been carried out over CoMo/Al2O3–TiO2 catalystsin a batch reactor at 320°C and 5.5 MPa. The supports were prepared with different raw materials and nitrilotriacetic acid (NTA) was used as a chelator at different concentrations. X-ray diffraction, Fourier transform infrared spectroscopy, temperature programmed desorption of NH3, and Brunauer–Emmett–Teller surface area experiments were used to characterize the catalyst samples. The results showed that the oxide prepared by an impregnation method with γ-alumina and tetraisopropyltitanate as the raw materials was the best support, having the highest surface area (239 m2 · g−1) and the highest acidity (1.112 mmolNH3 · g−1), and the catalyst with an NTA/Co mole ratio of 0.6 was the best sample, having a hydrodesulfurization activity value (on a pseudo first order kinetic constant basis) ~1.5 times higher than that of a CoMo/Al2O3 catalyst.