不同磷含量对NiMoP/Al2O3加氢处理催化剂的影响

采用NiMoP浸渍液浸渍载体γ Al₂O₃制备了不同磷含量的NiMoP/Al₂O₃加氢处理催化剂。为了研究磷对该系列催化剂活性相结构的影响，用二苯并噻吩（DBT）和喹啉为模型化合物，考察了催化剂的加氢脱硫（HDS）和加氢脱氮（HDN）性能。结果表明，添加适当的磷能够提高催化剂的HDS和HDN活性，但是高含量的磷能显著的降低催化剂的催化性能。通过对催化剂进行XRD和HRTEM表征发现，添加磷能够增加MoS2的堆积层数以及Ⅱ型“Ni-Mo-S”相的相对含量，这是因为在制备过程中添加磷降低了活性组分与载体之间的相互作用。

Influences of different phosphorus contents on NiMoP/Al2O3 hydrotreating catalysts

NiMoP/Al₂O₃ hydrotreating catalysts with different phosphorus contents were prepared by impregnating NiMoP aqueous solution into γ-Al₂O₃. The hydrodesulfurization (HDS) and hydrodenitrogenation (HDN) performances of the catalysts were evaluated using the model compounds dibenzothiophene and quinoline in toluene. The results show that the HDS and HDN performances of the catalysts can be improved by adding appropriate quantities of phosphorus in the catalysts, and its performance can be decreased markedly when the catalysts have high phosphorus content. The catalysts were investigated by means of XRD and high-resolution transmission electron microscopy (HRTEM) to get a better understanding of the nature of active phases. The results of XRD and HRTEM characterizations indicate that the stacked layers number of active component MoS₂ nanoparticles increases with the increase of the phosphorus content. Because the interaction between active component and γ-Al₂O₃ carrier is weakened by adding phosphorus into the catalysts, the relative content of type-II “Ni-Mo-S” phase is increased.