【摘要】 以非晶态Ni-P合金为前驱体,在低温下通过PH3处理制备了Ni2P/SiO2-Al2O3催化剂,并用X射线衍射(XRD)、透射电镜(TEM)、电感耦合等离子体发射光谱、N2吸附和X射线光电子能谱(XPS)进行了表征,以二苯并噻吩为探针,在小型连续流动固定床反应器上考察了催化剂的加氢脱硫性能.XRD结果表明,在200~300℃范围内前驱体都可以完全转化为Ni2P,随着磷化温度的升高,晶体结构变得越来越完整.TEM观察发现,Ni-P粒子和Ni2P粒子的平均尺寸都在40~50nm,并且都能够高分散在SiO2-Al2O3载体上.XPS结果表明,不论是非负载还是SiO2-Al2O3负载的Ni2P,表层主要为Ni2P和钝化层Ni3(PO4)2.Ni2P/SiO2-Al2O3催化剂在实验范围内表现出很好的二苯并噻吩加氢脱硫性能.更多还原

【Abstract】 Ni₂P/SiO₂-Al₂O₃ catalysts were successfully prepared by treating amorphous Ni-P alloys with phosphine at low temperature. The as-prepared catalysts were characterized by X-ray diffraction （XRD）, transmission electron microscopy （TEM）, inductively coupled plasma atomic emission spectroscopy, N₂ adsorption, and X-ray photoelectron spectroscopy （XPS）. The XRD data showed that the amorphous Ni-P/SiO₂-Al₂O₃ precursors could be completely transformed to crystalline Ni₂P/SiO₂-Al₂O₃ at 200-300 ℃. The crystalline structure of Ni₂P became more prominent with increasing phosphatization temperature. The results of TEM indicated that Ni-P and Ni₂P particles were both 40-50 nm in diameter and were well dispersed on the supports. The XPS results suggested that the main components were Ni₂P and Ni₃（PO₄）₂ on the surface of both Ni₂P and Ni₂P/SiO₂-Al₂O₃. The Ni₂P/SiO₂-Al₂O₃ catalysts showed good activity for dibenzothiophene hydrodesulfurizationunder the experimental conditions.更多还原