Co-Mo/SiO2-Al2O3润滑油加氢处理催化剂的制备

以Pluronic P₁₂₃作结构导向剂，采用Al （NO₃）₃-NaAlO₂双水解法合成氧化铝，在成胶过程中加入正硅酸乙酯，制备硅质量分数分别为5%、10%、15%的SiO₂-Al₂O₃载体，并通过共浸渍法制备出Co-Mo/SiO₂-Al₂O₃润滑油加氢处理催化剂。通过XRD、N₂吸附-脱附、Py-FTIR、NH₃-TPD、H₂-TPR、TEM和XRF等手段对载体及催化剂的性质进行表征。结果表明，硅质量分数为10%的SiO₂-Al₂O₃具有优良的孔结构、较多的中强酸以及部分有序的介孔结构。以此为载体制备的Co-Mo/10% SiO₂-Al₂O₃催化剂中，MoS₂颗粒均匀地分散在载体上，具有更多的B酸性位和Ⅱ型CoMoS活性相。以减二线蜡油为原料油的固定床活性评价结果表明，生成油中主要组分为链烷烃与环烷烃；尤其Co-Mo/10% SiO₂-Al₂O₃催化剂具有优良的加氢性能，在15 MPa、380℃、氢油比为1000、空速为0.6 h^-1的反应条件下，其HDS和HDN数值均超过99%，产品中S含量小于10 μg/g，N含量小于2 μg/g，可以满足后续异构脱蜡等对原料的要求。

Preparation of Co-Mo/SiO2-Al2O3 catalyst for hydrotreating lubricating oil

SiO₂-Al₂O₃, with a mass content of 5%, 10% and 15%, was synthesized by using a Al(NO₃)₃-NaAlO₂ double hydrolysis method, with surfactant Pluronic P₁₂₃ as template and Si(OC₂H₅)₄ as Si source. The Co-Mo/SiO₂-Al₂O₃ hydrotreating catalysts for lubricating oil were then prepared by co-impregnation method and characterized by a series of techniques such as XRD, N₂ sorption, Py-FTIR, NH₃-TPD, H₂-TPR, TEM and XRF. The results show that the SiO₂-Al₂O₃ support containing 10% Si is provided with abundant moderate-strong acid sites and partially ordered mesoporous structure; MoS₂ particles are uniformly dispersed on the SiO₂-Al₂O₃ surface. Moreover, the Co-Mo/10%SiO₂-Al₂O₃ catalyst exhibits high amount of Bronsted acid sites and type Ⅱ CoMoS active phase. The catalytic performance was evaluated in a high-pressure fixed-bed reactor, with second vacuum side distillate oil as the raw material oil. The results show that the Co-Mo/10%SiO₂-Al₂O₃ catalyst exhibits high activity in hydrotreating and paraffins and cycloalkanes are the main components in product oil. Under 380℃, 15 MPa, a space velocity of 0.6 h^-1, and a hydrogen to oil ratio of 1000, the HDS and HDN values over Co-Mo/10%SiO₂-Al₂O₃ exceed 99%. Meanwhile, the contents of S and N in the product are less than 10 and 2 μg/g, respectively, which can meet the requirements on the raw materials for the subsequent isomerization dewaxing process.