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

摘要： 以优化制备工艺为目的，研究不同制备方法对Ni-Mo/Al₂O₃加氢催化剂性能的影响。分别采用常规负载法、“一步成型法”和“沉淀打浆法”制备了Ni-Mo/Al₂O₃加氢催化剂，以氮气吸附（BET）、X射线衍射（XRD）、程序升温脱附（NH₃-TPD）、程序升温还原（H₂-TPR）和高分辨透射电镜（HR-TEM）等表征手段对3种方法制备的催化剂进行分析，并以50mL高压加氢装置考察了催化剂的反应性能。研究结果表明，与负载法相比，采用“一步成型法”和“沉淀打浆法”制备催化剂，孔容和比表面积大幅提高，但物相形态并没有发生转变；“一步成型法”制备的催化剂酸分布呈现出强酸比例升高的趋势，金属还原性及分散度也比负载法有所下降，“沉淀打浆法”制备的催化剂则显示出较高的中强酸量比例，金属还原性与分散度亦优于负载法催化剂。对催化剂的评价结果显示，针对不同的原料，3种催化剂均具有较好的加氢脱硫、脱氮和芳烃饱和活性，但总体上“一步成型法”制备的催化剂活性较负载法有所不足，而“沉淀打浆法”制备的催化剂活性则优于负载法，评价结果与催化剂的表征分析相吻合。

关键词: 加氢, 催化剂, 制备方法, 活性