高分散Ni_(2)P/γ-Al_(2)O_(3)催化剂的制备及其加氢脱硫性能研究

Preparation of highly-dispersed Ni_(2)P/γ-Al_(2)O_(3)catalyst and its catalytic performance in hydrodesulfurization

分别以商品化和水热法合成的多级孔结构的γ-Al_(2)O_(3)为载体,采用磷源热解法制得负载型Ni_(2)P催化剂。通过XRD、SEM、N2物理吸脱附和CO化学吸附等手段对所制备的载体及催化剂进行表征,考察了不同载体对催化剂常压下噻吩加氢脱硫性能的影响。结果表明,自制的γ-Al_(2)O_(3)具有更高的比表面及发达的微观结构,以其为载体制备的Ni_(2)P催化剂具有更高的分散度及催化脱硫性能。在反应温度为370℃、反应压力为1.01×10^(5) Pa、氢/油体积比为500、空速为3.2 h^(-1)的条件下,HDS转化率达到95.5%。

Supported Ni_(2)P catalysts are prepared via phosphorus source pyrolysis method using commercial hierarchical poreγ-Al_(2)O_(3)and self-made hierarchical poreγ-Al_(2)O_(3)by hydrothermal method as carriers,respectively.The as-synthesized catalysts and supports are characterized by N2 adsorption-desorption,XRD,SEM and CO-chemisorption.Influences of different carriers on the catalysts'performance in hydrodesulfurization(HDS)of thiophene under normal pressure are studied.Results show that self-made hierarchicalγ-Al_(2)O_(3)has higher specific surface and well-developed microstructure,and the corresponding catalyst shows higher dispersion and better catalytic desulfurization performance.HDS conversion reaches 95.5%when reaction temperature remains at 370℃,reaction pressure is 1.01×10^(5)Pa,volume ratio of H2/oil is 500,and hourly space velocity is 3.2 h^(-1).