Effect Of Promoters And Supports On Performances Of MoP/γ-Al₂O₃ Hydrofining Catalysts

In this paper, a series of supported molybdenum phosphide were prepared by impregnation and characterized by TG-DTG, XRD, XPS, BET and NH3-TPD techniques. The hydrogenation catalytic tests were carried out in a continuous-flow reactor at 340℃ or 370℃ under 3.0MPa. Two model compounds were used as reactant, one contained thiophene, pyridine and cyclohexene, the other contained dibenzothiophene, quinoline and naphthalen. The main conclusions were as follows:The catalytic activity for hydrodenitrogenation of quinoline on MoP/ γ-Al₂O₃ catalysts changes slightly with the increase of reaction temperature. The catalytic activity for hydrodesulfurization of dibenzothiophene on MoP/ γ -Al₂O₃ catalysts is better at higher reaction temperature, but the catalytic activity for hydrogenation of naphthalene is better at lower reaction temperature. The change of space velocity has little effect on HDS and HDN activity of MoP/γ-Al₂O₃ catalysts, but obvious on HYD activity.The changes of the catalytic activity of Co-MoP/γ -Al₂O₃ catalysts with reaction temperature are consistent with MoP/γ -Al₂O₃ catalysts when the model compoud contains dibenzothiophene, quinoline and naphthalene. The HDS activity of Co-MoP/ Al₂O₃ catalysts is more effective than commercial catalysts and sulfured ones. When the model compoud contains...