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以蔗糖为辅助剂,采用溶胶-凝胶法制备了介孔氧化铝及相应的Co-Mo/TiO2-Al2O3汽油脱硫催化剂,并对其进行了TEM、XRD和N2吸附表征。以FCC汽油重馏分为原料,重点考察了不同条件下制得的Al2O3对催化剂选择性加氢脱硫性能的影响。结果表明,蔗糖(sucrose)添加量和pH值对Al2O3织构产生影响,进而影响到对应催化剂的加氢脱硫性能;在Al/sucrose摩尔比1∶1、pH值5.4时Al2O3的比表面积最大、孔径分布最窄,对应催化剂的选择性加氢脱硫活性最好;Al2O3的最可几孔径随pH值的增加而增大;溶胶老化温度对Al2O3的比表面积和孔容影响较大,但对最可几孔径和孔径分布影响较小。与Co-Mo/TiO2-sAl2O3(以sAl2O3表示市售Al2O3)催化剂相比,Co-Mo/TiO2-Al2O3催化剂具有较好的选择性加氢脱硫活性,在考察的条件范围内,脱硫率相同时其对应的烯烃饱和度低5%～15%左右。
Mesoporous alumina and corresponding Co-Mo / TiO2-Al2O3 gasoline desulfurization catalysts were prepared by sol-gel method using sucrose as auxiliary agent. The catalysts were characterized by TEM, XRD and N2 adsorption. The FCC gasoline heavy fraction was taken as the raw material, and the influence of Al2O3 prepared under different conditions on the performance of selective hydrodesulfurization was investigated. The results showed that the addition of sucrose and the pH value affected the texture of Al2O3, which in turn affected the hydrodesulfurization performance of the catalyst. When the molar ratio of Al / sucrose was 1: 1 and pH was 5.4, the specific surface area of Al2O3 was the highest, The pore size distribution is the narrowest, and the selective hydrodesulfurization activity of the corresponding catalyst is the best. The most probable pore diameter of Al2O3 increases with the increase of pH value. The aging temperature of sol has a great influence on the specific surface area and pore volume of Al2O3, Several aperture and pore size distribution can be less affected. Compared with Co-Mo / TiO2-sAl2O3 catalyst (commercially available Al2O3 as sAl2O3), the Co-Mo / TiO2-Al2O3 catalyst has better selective hydrodesulfurization activity. Under the same conditions, The corresponding olefin saturation is about 5% ~ 15% lower.