关键词: 加氢, 催化剂, 制备方法, 活性

Abstract: In order to optimize the preparation technique of Ni-Mo/Al₂O₃ catalysts, the influence of the preparation method on their hydrotreating activity was investigated. Catalysts were prepared by three different methods including "support method", "one-step forming method" and "precipitation-beating method". Physical and chemical properties of the obtained catalysts were characterized by BET, XRD, NH₃-TPD, H₂-TPR and HRTEM,and the reaction activity was evaluated on a 50mL high-pressure hydrogenation fixed-bed reactor. The results indicated that, compare with the "support method", the catalysts prepared by the "one-step forming method" and the "precipitation-beating method" had larger pore volume and surface area, but the crystal phase structure had not changed. Catalysts prepared by "one-step forming method" had more proportion of strong acid, with decreased reducibility and dispersity of the active metals. On the contrary, catalysts prepared by the "precipitation-beating method" had more medium strong acid, and the reducibility and dispersity of the active metals were better than that of the catalyst prepared by the "support method". Result of the reaction activity evaluation indicted that, the three kinds catalysts all had good activity on hydrodesulfurization, hydrodenitrification and aromatics saturation. The hydrogenation activity of the catalyst prepared by the "one-step forming method" was worse than that by the "support method", whereas the catalyst prepared by the "precipitation-beating method" performed even better. The evaluation result was consistent with that of the characterization analysis.

Key words: hydrogenation, catalyst, preparation method, reactivity