Pt对Ni2P/MCM-41催化剂加氢脱硫性能的影响

以MCM-41为载体, 采用程序升温还原法制备了含有少量Pt的Ni-P/MCM-41催化剂, 并用氢气程序升温还原(H₂-TPR)、 X射线衍射(XRD)、 N₂吸附比表面积、 X射线光电子能谱(XPS)和透射电子显微镜(TEM)对催化剂的结构和性能进行了表征. 考察了P/Ni摩尔比及Pt含量对Ni-P/MCM-41催化剂催化二苯并噻吩(DBT)加氢脱硫(HDS)性能的影响. 结果表明, Pt能降低Ni₂P催化剂的还原温度, 并有助于Ni₂P相的生成, 抑制团聚现象, 提高催化剂的HDS活性. 当Pt的质量分数为0.6%, P/Ni摩尔比为2时, 催化剂具有最佳加氢脱硫活性, 在340 ℃, 3.0 MPa, 氢油体积比为500, 质量空速(WHSV)为2.0 h^-1的条件下, 二苯并噻吩转化率为100%, 且催化剂加氢脱硫活性在120 h内基本保持稳定.

Effect of Pt on Hydrodesulfurization Performance of the Ni2P/MCM-41 Catalyst

Nickel phosphide catalysts, Ni-P/MCM-41 adding with small amounts of Pt, were made by means of temperature programmed reduction method. The catalysts were characterized by hydrogen temperature programmed reduction(H₂-TPR), X-ray diffraction(XRD), N₂-adsorption specific surface area measurements, X-ray photoelectron spectroscopy(XPS) and transmission electron microscopy(TEM). The effects of different P/Ni molar ratio and amounts of Pt added on catalyst activity for dibenzothiophene(DBT) hydrodesulfurization(HDS) were studied. The results showed that the addition of Pt into the catalyst can decrease the reduction temperature of the Ni₂P catalysts, contribute to the formation of Ni₂P phase, inhibit reunite phenomenon and improve the HDS catalytic activity of Ni₂P catalysts. The HDS activity of the catalyst containing 0.6%Pt, with P/Ni molar ratio of 2 was found to be optimal. At reaction temperature of 340 ℃, pressure of 3.0 MPa, hydrogen/oil volume ratio of 500, and weight hourly space velocity(WHSV) of 2.0 h^-1, the conversion of dibenzothiophene HDS was 100%, and the HDS activity could remain stable within 120 h.