Abstract: CoMo catalysts used for hydrodesulfurization (HDS) were prepared by impregnation method using four different Y zeolites to adjust alumina support, XRD, BET, NH3-TPD, Py-IR and HRTEM were used for the characterization, and the effect of different Y zeolite modified alumina supports on HDS performance of catalysts was investigated. The results showed that the texture properties of the catalysts modified by Y zeolite changed, and the amount and intensity of acid varied in certain degrees; the B acid content increased, the interaction between the active metal and the support weakened, more CoMoS(II) active phases were formed, and the HDS activity of the catalyst was increased. Among them, the catalysts modified by HY and YI zeolites had excellent HDS performance, under the conditions of a reaction temperature of 260 ℃,a pressure of 2 MPa,a hydrogen-oil volume ratio of 200 and a volume space velocity of 2 h^-1, the desulfurization rates on Cat-A and Cat-C catalysts for DBT model compounds were 98.67% and 99.57%, respectively.

Key words: Y zeolite, alumina, CoMo catalyst, hydrodesulfurization, CoMoS(II) active phase