ZSM-5催化剂加氢脱硫与烯烃芳构化反应研究

采用Na2CO3溶液以及Na2CO3/TPAOH（四丙基氢氧化铵）混合碱溶液对不同硅铝比的ZSM-5分子筛进行处理，用XRD，BET，NH3-TPD，SEM等方法对碱处理前后的ZSM-5分子筛进行表征。结果表明：Na2CO3/TPAOH混合碱处理没有破坏ZSM-5分子筛原晶体形貌，且更利于增加分子筛的比表面积和介孔体积。以FCC汽油为原料，对碱处理后不同硅铝比的ZSM-5分子筛制得的Co-Mo/ZSM-5催化剂进行加氢脱硫及烯烃芳构化性能评价。结果表明，在反应温度为400 ℃、反应压力为2.5 MPa、氢油体积比为300∶1、反应空速为1.5 h-1的条件下，脱硫率为94.2%，芳烃收率为30.82％。

HYDRODESULFURIZATION AND OLEFIN AROMATIZATION OVER Co-Mo/ZSM-5 ZEOLITE TREATED BY MIXED ALKLI

ZSM-5 zeolites with different Si/Al ratios were treated by mixed alkali solution of Na2CO3 and TPAOH solution. The zeolites before and after alkali treatment were characterized by XRD, BET, SEM and NH3-TPD techniques. The results showed that the original zeolite frame structure was not destroyed after Na2CO3/TPAOH treatment, and the alkali treatment were beneficial to the increasing of specific surface area, external surface area, average pore size, and pore volume of mesoporous for HZ (80-4-0.2). With FCC gasoline as the raw material, the reaction of hydrogenation desulfurization and aromatic over CoMo/ZSM-5 catalyst prepared by ZSM-5 zeolites before and after alkali treatement were studied. At the certain reaction contion CoMo/HZ（80-4-0.2）showed the most desulfurization rate and the most yield of aromatization. The effect of process conditions on the reaction of hydrogenation desulfurization and aromatization of CoMo/HZSM-5(80-4-0.2) in a small fixed bed reactor was investigated. The results illustrated that when the reaction temperature was 400 ℃, the reaction pressure was 2.5 MPa, the reaction velocity was 1.5 h-1, the desulfurization rate was the higher, 94.2%., and the yield of aromatization was the larger, 30.82%.