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采用共浸渍和程序升温高纯氢气还原的方法合成了WP/γ-Al2O3催化剂,对催化剂进行了XRD、BET和XPS表征,考察了还原时间对催化剂结构的影响。通过高压微反对催化剂的二苯并噻吩加氢脱硫和咔唑加氢脱氮活性进行了评价。结果表明:增加还原时间,有利于提高活性组分在载体表面的分散度,有利于增加催化剂的比表面积。还原时间增加,催化剂表面的P/W原子比提高,表面高价态的W6+所占比例增加,而氧化态的P5+所占比例有所降低。二苯并噻吩HDS活性和咔唑HDN活性都随催化剂还原时间的增加而提高。磷化钨催化剂更有利于大分子化合物的HDN反应,是一个良好的HDN催化剂。
The WP / γ-Al2O3 catalyst was synthesized by co-impregnation and high temperature hydrogen reduction. The catalysts were characterized by XRD, BET and XPS. The effect of reduction time on the catalyst structure was investigated. The dibenzothiophene hydrodesulfurization and carbazole hydrodenitrogenation activity were evaluated by high pressure micro-reaction catalyst. The results show that increasing the reduction time can improve the dispersion of the active component on the surface of the support and increase the specific surface area of the catalyst. The reduction time increases, the atomic ratio of P / W increases on the catalyst surface, the proportion of W6 + in the surface valence state increases, while the proportion of P5 + in the oxidation state decreases. The dibenzothiophene HDS activity and carbazole HDN activity all increased with the increase of catalyst reduction time. Tungsten phosphide catalyst is more conducive to macromolecular HDN reaction, is a good HDN catalyst.