FCC汽油选择性加氢脱硫催化剂Ru/Al_2O_3的研究

Researches on Ru/Al_2O_3 catalyst for selective hydrodesulfurization of FCC gasoline

以900℃焙烧的Al_2O_3为载体,用浸渍法制备了蛋壳型Ru催化剂,Ru的负载质量分数为3%,并对催化剂进行了BET和XRD表征。催化剂活性评价在高压微反装置上进行,以FCC汽油为原料,评价前催化剂预硫化。结果表明,400℃高温焙烧会造成Ru的烧结,不焙烧(仅120℃干燥6h)的催化剂具有较高活性,对于FCC汽油的选择性加氢脱硫,在300℃、2.0MPa、空速2h^(-1)和氢油体积比=200:1条件下,FCC汽油的加氢脱硫率达66.4%,烯烃加氢饱和率达24.7%,选择性因子仅为3.8。单组分Ru催化剂用于FCC汽油的加氢脱硫时有一定的选择性,但结果不理想。

The egg-shell Ru/Al2O3 catalyst with Ru loading of 3% （ mass fraction） was prepared using the support calcined at 900℃ by impregnation method. The catalyst was characterized by BET and XRD. Catalytic activities of Ru/Al2O3 was investigated in a high-pressure micro-reactor using FCC gasoline as reactant and the catalysts were presulfided before the tests. The results showed that calcination at high temperature （400 ℃ ） caused Ru sinter in the catalyst and decreased the catalytic activity. The uncalcination sample （dried at 120 ℃for 6 h） exhibited better activity. The HDS of 66.4%, HYD of 24.7%, and selective factor of only 3.8 for selective hydrodesulfurization of FCC gasoline were attained under the condition as follows： 300℃ ,2.0 MPa, LHSV 2 h-1 and volume ratio of hydrogen to oil 200： 1. Ru/Al2O3 without other additives showed certain selectivity for the hydrodesulfurization of FCC but the result was not ideal. gasoline,