碱改性HZSM-5分子筛催化噻吩烷基化性能的研究  

Study on catalytic performance for thiophene alkylation of ZSM-5 molecular sieve modified by alkali

作　　者：郭扬[1] 刘冬梅[1] 魏民[1] 孔飞飞[1] 汤简赫 王迪 

机构地区：[1]辽宁石油化工大学化学化工与环境学部,辽宁抚顺113001 [2]中国石油安徽销售分公司,安徽合肥230041

出　　处：《石化技术与应用》2017年第5期344-349,共6页Petrochemical Technology & Application

基　　金：辽宁省自然基金资助项目(项目编号:201202126)

摘　　要：分别采用Na_2CO_3,Na_2CO_3/十六烷基三甲基溴化铵(CTAB)混合碱对HZSM-5分子筛进行改性处理,利用X射线衍射仪(XRD)、BET法、扫描电子显微镜(SEM)、N2等温吸附脱附、氨程序升温脱附(NH3-TPD)等分析手段对碱处理前后的分子筛进行了表征,并考察了碱处理前后HZSM-5分子筛催化噻吩烷基化的性能。结果表明:采用Na_2CO_3/CTAB混合碱处理商业HZSM-5分子筛[n(Si O2)/n(Al2O3)为50],在Na_2CO_3溶液浓度为4 mol/L,c(CTAB)/c(Na_2CO_3)为0.050的最优条件下,分子筛的比表面积由改性前的318 m2/g增大到485 m2/g,催化噻吩烷基化反应的噻吩转化率、选择性则分别由改性前的35.47%,58.32%依次提高到93.57%,79.68%。HZSM - 5 molecular sieve was modified by Na2CO3 solutions and Na2COJCTAB mixed al- kali solutions respectively. The samples before and after alkali treatment were characterized by XRD, BET, N2 adsorption - desorption, SEM and NH3 - TPD analysis methods,and the catalytic performance for thiophene alkylation of the samples before and after alkali treatment were investigated. The results showed that when the commerical HZSM - 5 molecu- lar sieve [ n （ SiO2 ）/n （ AI203 ） = 50 ] was treated by Na2COJCTAB mixed alkali,and the optimal condi-tions of the molar concentration of Na2CO3 solutions was 4 mol/L and c （CTAB）/c （Na2CO3） was 0. 050, the specific surface area of the molecular sieve increased from 318 m2/g to 485 m2/g,and the thiophene conversion and selectivity of the catalytic thiophene alkylation reaction increased from 35.47% and 58.32% to 93.57% and 79.68% respectively.

关 键 词：分子筛 HZSM-5分子筛 碱处理 噻吩烷基化 孔结构 

分 类 号：TE624.9[石油与天然气工程—油气加工工程]