以溶胶-凝胶法制备的TiO_2-Al_2O_3复合氧化物为载体,采用浸渍法制备了Ni_2P/TiO_2-Al_2O_3催化剂,并用X射线衍射、N_2吸附脱附、红外和X射线光电子能谱等技术对催化剂进行了表征,考察了载体中TiO_2含量、焙烧温度及其制备方法对Ni2_P/TiO_2-Al_2O_3催化剂上同时进行噻吩加氢脱硫和吡啶加氢脱氮反应的影响.结果表明,以Ni/P摩尔比为1/2的前驱体制备的催化剂表面仅出现Ni_2P物相;当载体中TiO_2的含量为80%,焙烧温度为550℃时,Ni_2P/TiO_2-Al_2O_3催化剂上加氢脱硫和加氢脱氮的活性最高.在360℃,3.0MPa,氢/油体积比500,液时体积空速2.0h~(-1)的条件下,噻吩和吡啶转化率分别为61.3%和64.4%.
The TiO_2-Al_2O_3 complex support was prepared by the sol-gel method, and the nickel phosphide catalyst, Ni_2P/TiO_2-Al_2O_3, was made by impregnation. The catalysts were characterized by X-ray diffraction, N_2 adsorption-desorption, infrared spectroscopy, and X-ray photoelectron spectroscopy. The catalysts were evaluated on a lab-scale continuous-flow fixed-bed reactor for hydrodesulfurization (HDS) of thiophene and hydrodenitrogenation (HDN) of pyridine. The experiments were conducted to further investigate the influence of the support, i.e. the support preparation method, TiO_2 content, and support calcination temperature, on the catalyst activity. The results showed that the Ni2_P phase appeared only in the catalysts prepared from precursors with Ni/P atomic ratio of 1/2. The catalyst made from TiO_(2-)Al_2O_3 complex oxide with 80% TiO_2 as support, which was prepared by the sol-gel method and calcined at 550 ℃, exhibited the highest activity for thiophene HDS and pyridine HDN. At reaction temperature of 360 ℃, pressure of 3.0 MPa, hydrogen/oil volume ratio of 500, and liquid hourly space velocity of 2.0h~(-1), the conversion of thiophene HDS and the conversion of pyridine HDN were 61.3% and 64.4%, respectively.
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