规整填料型加氢脱硫催化剂的制备及性能评价

Preparation and evaluation of hydrodesulfurization catalysts supported on regular filler-type porous anodic alumina

用电化学方法制备多孔氧化铝膜,并负载Mo-Co活性组分制得了金属支撑-多孔层规整填料型加氢催化剂。采用BET和SEM技术表征了多孔性氧化铝膜的物理结构,并考察了电解及后处理条件的影响。结果表明,电解液浓度、氧化时间、水封时间、水封温度等对多孔氧化铝膜的比表面积影响显著。采用二次氧化的方法,在质量分数为4%的草酸电解液、氧化时间1 h、80℃水封3 h条件下,所制备的多孔氧化铝膜具有相对较大的比表面积。汽油重馏分加氢反应结果表明该类催化剂具有较高的催化活性和选择性。

Catalyst supports with a metal wall and a porous layer,were prepared by an anodic oxidation method.The supported Co-Mo/ Al2O3-Al catalysts were obtained by impregnation with ammonium molybdate and cobalt nitrate.The physical structure of the porous anodic alumina was characterized by using SEM and BET.The results indicated that the influences of electrolysis and after-treatment conditions,including electrolyte concentration,hydration time and temperature,and organic addition,on the structure of porous anodic alumina were significant.The pore size and SBET can be adjusted by altering the electrolysis and after treatment conditions.High-porosity and higher surface area alumina supports were prepared via two-step anodization method under the conditions of oxalic acid concentration 4 %,anodic oxidation time 1 h,hydration temperature 80 oC and hydration time 3 h.The catalysts exhibited considerable selectivity and activity for FCC gasoline heavy fraction hydrodesulfurization.