Hydrodesulfurization Reaction on CoMo Catalysts: Effect of Preparation Method

摘要

Hydrodesulfurization of dibenzothiophene (HDS of DBT) has been carried out over CoMo/Al2O3-TiO2 cata-lystsin a batch reactor at 320°C and 5.5 MPa. The supports were prepared with different raw materials and ni-trilotriacetic 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 (239m~2·g~(-1)) and the highest acidity (1.112 mmol_(NH3)· 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.