Al2O3-ZrO2负载Ni2P催化剂加氢脱硫脱氮活性

采用浸渍-沉淀法制备Al2O3-ZrO2复合氧化物,通过程序升温还原法制备Ni2P/Al2O3-ZrO2催化剂。运用X射线衍射、N2吸附-脱附、X射线光电子能谱技术对载体和催化剂进行表征,并以噻吩加氢脱硫、吡啶加氢脱氮反应为探针考察复合氧化物对Ni2P催化剂加氢活性的影响。结果表明,在Al2O3表面引入少量ZrO2,既保持了γ-Al2O3大比表面积的结构优势,又减少了P或Ni与Al2O3表面的接触,促进Ni2P的形成。载体中ZrO2质量分数20%的Ni2P/Al2O3-ZrO2催化剂活性最高,载体焙烧温度过高会导致催化剂活性下降。

Study on the hydrodesulfurization and the hydrodenitrogenation over Al2O3-ZrO2 supported Ni2P catalysts

A series of Al2O3-ZrO2 composite oxides were prepared by impregnation-deposition method.Ni2P/Al2O3-ZrO2 catalysts were prepared by temperature-programmed reduction in a H2 flow.The supports and catalysts were characterized by X-ray diffraction(XRD),N2 adsorption-desorption and X-ray photoelectron spectroscopy(XPS).The effect of composite oxides on the performance of Ni2P catalysts was studied by thiophene hydrodesulfurization and pyridine hydrodenitrogenation.The results showed that the introduction of small amounts of ZrO2 on the surface of Al2O3 would not only keep high surface area of γ-Al2O3 but also reduce the contact between P or Ni and the surface of Al2O3,and therefore,promote the formation of Ni2P.Ni2P/Al2O3-ZrO2 catalyst made from Al2O3-ZrO2 support with 20% ZrO2 exhibited the highest activity.And the activity of catalyst would decrease with higher calcination temperature of supports.