【摘要】 以硅酸钠为原料,以大孔Al2O3为基载体,采用水解沉积法制备了SiO2-Al2O3复合载体.进而以非晶态镍基合金为前驱体,在低温下通过PH3处理制备了Ni2P/SiO2-Al2O3催化剂.用X射线衍射、红外光谱、扫描电镜、电感耦合等离子体发射光谱和N2吸附技术对复合载体和催化剂进行了表征,并以4,6-二甲基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.结果表明,在γ-Al2O3载体表面引入SiO2能够明显减少γ-Al2O3表面四配位的Al3+离子,从而减弱Ni2P/SiO2-Al2O3催化剂中Ni2P和γ-Al2O3载体表面的强相互作用.加入适量的SiO2后,SiO2-Al2O3复合载体仍能保持大孔γ-Al2O3载体孔结构的优势.在实验范围内,Ni2P/SiO2-Al2O3催化剂表现出很好的加氢脱硫性能.更多还原

【Abstract】 A series of SiO2-Al2O3 composite supports were prepared by simple hydrolysis and deposition of Na2SiO3·9H2O on macropore Al2O3. Ni2P/SiO2-Al2O3 catalysts were prepared by treating amorphous Ni alloys supported on SiO2-Al2O3 with phosphine at a low temperature. The as-obtained samples were characterized by X-ray diffraction, infrared spectroscopy, scanning electron microscopy, inductively coupled plasma-atomic emission spectroscopy, and N2 adsorption. The presence of SiO2 decreased the amount of four-complexing Al3+ ions on the surface of Al2O3 and weakened the strong interaction between the Al2O3 support and Ni2P. The SiO2-Al2O3 composite support still kept the pore structure of macropore Al2O3 when the content of SiO2 was proper in the composite supports. Ni2P/SiO2-Al2O3 catalysts showed good activity for the hydrodesulfurization of 4,6-dimethyl-dibenzothiophene under the experimental conditions.更多还原