水热处理对Zn-P/HZSM-5催化剂芳构化性能的影响

在不同温度下对HZSM-5分子筛进行水热处理并用浸渍法对其进行Zn和P改性,制备了Zn-P/HZSM-5催化剂;以流化催化裂化汽油50~100℃馏分为原料,考察了水热处理温度及水热处理顺序对Zn-P/HZSM-5催化剂芳构化性能的影响。实验结果表明,随水热处理温度的升高,催化剂的初始活性下降,而稳定性则先提高后降低;550℃水热处理后再经Zn和P改性的Zn-P/HZSM-5催化剂表现出较好的芳构化性能,在反应温度410℃、反应压力0.5M Pa、液态空速1.0h-1、反应时间16h的条件下,烯烃转化率、液相产物中芳烃质量分数及液相产物收率分别为90.26%,54.06%,74.62%;先对HZSM-5分子筛进行水热处理再用Zn和P对其改性的Zn-P/HZSM-5催化剂,比先用Zn和P对其改性而后进行水热处理的Zn-P/HZSM-5催化剂的活性和稳定性好。

Effect of Hydrothermal Treatment on Aramatization Performance of Zn-P/HZSM-5

Zn-P/HZSM-5 catalysts were prepared by hydrothermal treatment and impregnation modification with zinc and phosphor to HZSM-5 zeolite.The influences of the hydrothermal treatment temperature and sequence on the catalyst performance in aromatization of FCC gasoline(50-100 ℃ fraction) were investigated.The result showed that,with the hydrothermal temperature increasing,the initial catalyst activity gradually decreased,and the stability firstly increased and then decreased.The HZSM-5 zeolite hydrothermally treated at 550 ℃ and then modified by zinc and phosphor exhibited preferable aromatization performance.Under the reaction conditions of 410 ℃,0.5 MPa,LHSV 1.0 h-1 and 16 h,the olefin conversion,the aromatics mass fraction and the liquid product yield were 90.26%,54.06% and 74.62%,respectively.