Ni/ZSM-5-Al2O3催化剂上润滑油基础油 临氢降凝反应性能研究

以ZSM—5分子筛和拟薄水铝石为原料,硝酸镍为镍源,采用挤条成型及等体积浸渍法制备了不同镍负载量的催化剂。通过N_2吸附-脱附、X射线衍射和吡啶吸附红外光谱等方法对催化剂进行了表征。以加氢裂化尾油为原料,在固定床反应装置上对自制催化剂进行了临氢降凝反应评价。结果表明,负载适量镍可以改善催化剂的孔结构和酸性;在反应温度为280℃、空速为1.0 h~(-1)、氢油比为500、压力为15 MPa的条件下,使用镍负载量为5%的催化剂,可得到凝点为-19℃,收率为62.4%,黏度指数为92的润滑油基础油。

Research of hydrodewaxing reaction for Lube base oil on Ni/ZSM-5-Al2O3 catalysts

A series of hydrodewaxing catalysts with different amounts of Ni are prepared by extruded and incipient impregnation, using ZSM-5 zeolite and pseudoboehmite powder as raw materials, and nickel nitrate as the source of nickel. The catalysts are analyzed by the method of N2 adsorption and desorption, XRD and Py-IR. The catalytic dewaxing effect of these catalysts are evaluated on a fixed bed reactor using hydrocracking tail oil as the feed stock. The results show that the pore structure and acidity of catalyst could be improved by the addition of nickel. Under the condition of reaction temperature 280oC, reaction pressure 15MPa, LHSV 1.0h-1 and V(H2)/V(Oil) 500, a lube base oil, with freezing point of -19oC, yield of 62.4% and viscosity index of 92, can be obtained by using 5% Ni loading catalysts.