低黏度聚α-烯烃合成油加氢精制催化剂的制备及性能评价

在氧化铝载体制备过程中添加硼元素进行改性，将所得改性载体通过等体积浸渍法浸渍钨、钼、镍金属溶液，制得低黏度聚α-烯烃合成油加氢精制催化剂，采用XRD、H₂-TPR等手段对改性载体和加氢精制催化剂进行表征。结果表明，加氢精制催化剂载体通过硼改性，可以降低活性金属组分与载体的相互作用，催化剂的酸性大大增强，同时还能引入B酸。在反应温度为240 ℃、氢分压为4.5 MPa、体积空速为0.2 h^-1、氢油体积比为300∶1的条件下，考察改性加氢精制催化剂应用于PAO4加氢的芳烃饱和性能，并与未改性催化剂进行对比，结果表明，改性前后的加氢精制催化剂均可有效改善产品的颜色，但改性加氢精制催化剂的芳烃饱和性能远远高于未改性催化剂。改性加氢精制催化剂稳定性评价结果表明，该催化剂具有良好的活性稳定性，能够满足工业应用的要求。

PREPARATION AND PERFORMANCE EVALUATION OF HYDROFINING CATALYST FOR LOW VISCOSITY PAO

Boron was added in the preparation process of alumina carrier for modification. The hydrofining catalyst for low viscosity PAO based on the modified carrier was prepared by equal volume impregnation. The modified carrier and catalysts were characterized by BET, XRD, H₂-TPR, and Hy-IR techniques. The characterization results showed that the boron modified hydrofining catalyst carrier reduced the interaction between the active metal components and the carrier. The acidity of the catalyst was greatly enhanced and B acid was produced at the same time. At atemperature of 240 ℃, a hydregen pressure of 4.5MPa,a space velocity of 0.2h^-1 and a volume ratio of hydrogen to oil of 300:1, the aromatics saturation performance of modified hydrofining catalyst applied to PAO4 hydrogenation was investigated and compared with that of unmodified catalyst, the results showed that both of the catalysts could effectively improve the color of the product, but the aromatic saturation performance of the modified catalyst was much better than that of the unmodified catalyst. The stability evaluation results of the modified hydrofining catalyst showed that the catalyst had good activity and stability, which can meet the requirements of industrial application.