Abstract: Using large pore γ-Al2O3 prepared by acid precipitation, the Ni2P(25%)/γ-Al2O3 catalyst was prepared as the support by the impregnation method. The test results of XRD, BET and mercury porosimetry show that the large pore γ-Al2O3 has preferable surface area and pore structure. After in-situ reduction，the effects of preparation conditions and reaction conditions on dehydrocracking activity of the catalyst were studied in a fixed-bed down-flow reactor with the diesel as the material. The results show that desulfurization degree of 98.2% would be attained under the optimum condition as follows: synthesis temperature of 80 ℃, pH of 8，reaction temperature of 360 ℃，reaction pressure of 4.0 MPa，liquid hourly space velocity of 1.0 h-1 and volume ratio of hydrogen to cyclohexane of 500∶1.

Key words: 　Nickel phosphide ,  Large pore volume , γ-Al2O3 ,  Diesel oil ,  Hydrodesulfurization

摘要： 　采用酸沉淀法制备大孔γ－Ａｌ_２Ｏ_３为载体，并用浸渍法制备Ｎｉ_２Ｐ（２５％）／γ－Ａ１_２Ｏ_３催化剂。ＢＥＴ、ＸＲＤ、压汞法的分析结果显示：合成大孔γ－Ａｌ２Ｏ３载体晶型良好，且具有适宜比表面积和孔结构。催化剂经原位还原处理后，以柴油为原料在连续固定反应装置上，考察了催化剂的制备条件及反应条件对催化剂加氢脱硫活性的影响。结果表明：当载体合成温度为８０℃，反应ｐＨ为８，反应条件为温度３６０℃、压力４．０ＭＰａ、空速１．０ｈ^－１、氢烃体积比５００∶１时，催化剂的加氢脱硫活性最好，柴油的脱硫率可达９８．２％。

关键词: 　磷化镍 , 　大孔 , 　γ－Ａｌ_２Ｏ_３ , 　柴油 , 　加氢脱硫