蒸汽相法辅助碳模板合成介孔EU-1分子筛  

Synthesis of Hierarchical EU-1 Zeolite Using Carbon Templating with Vapor Phase Assisting Method

作　　者：高萌[1] 刘晓臻[1] 高李霞[1] 李国栋[1] 吕志平[1] 窦涛[1,2] GAO Meng;LIU Xiaozhen;GAO Lixia;LI Guodong;LYU Zhiping;DOU Tao(Research Institute o f Special Chemicals,Taiyuan University o f Technology j Taiyuan 030024,China;CNPC K ey Laboratory o f C atalysis,College o f Chemical Engineering,China University Petroleum^B eijing 102249,China)

机构地区：[1]太原理工大学精细化工研究所,太原030024 [2]中国石油大学化工学院CNPC催化重点实验室,北京102249

出　　处：《太原理工大学学报》2018年第2期204-210,共7页Journal of Taiyuan University of Technology

基　　金：国家自然科学基金资助项目(20973123);国家科技型中小企业技术创新资助项目(14C26211400552)

摘　　要：将蔗糖、硅源与铝源混合成凝胶,在170℃下部分碳化(MI)或者在无氧环境下400℃高温碳化(MII)两种方法原位制备碳硅铝复合物,然后采用蒸汽相法辅助合成多级孔EU-1分子筛。研究表明:MI、MII均可以有效提高样品的外表面积和介孔孔容,且当m(蔗糖)/m(SiO_2)为定值时,MII的介孔化能力优于MI.MI、MII合成的样品保持一致的规律,即随着m(蔗糖)/m(SiO_2)的增多,样品的结晶度逐渐降低,外表面积和介孔孔容逐渐增大,酸量明显减小。多级孔EU-1分子筛有利于扩散,有利于提高分子筛的二甲苯异构化催化性能,其催化活性从22.99%提升到23.92%,C8芳烃选择性从89.52%提升到91.12%.The synthetic gel was prepared by mixing sucrose,silicon and aluminum,and then partially carbonized at 170 ℃ in air(MI)or carbonized at 400 ℃ in oxygen-free environment(MII)to obtain carbon-silicon-aluminum compound.The vapor phase method was adopted to synthesize hierarchical EU-1 zeolite.The research results showed that MI and MII can effectively improve the surface area and the pore volume of mesopores.When the m(sucrose)/m(SiO_2)was a fixed value,the mesoporous capacity of MII was better than that of MI.The synthetic samples by MI and MII maintain a consistent rule:with m(sucrose)/m(SiO_2)increasing,the crystallinity of the samples decreases gradually;the surface area and pore volume increase little by little;the amount of weak acid and strong acid decreases obviously.The hierarchical EU-1 zeolite is favorable for the diffusion and improved catalytic performance for xylene isomerization,with the catalytic activity increasing from 22.99% to 23.92%,C8 aromatic hydrocarbon selectivity increasing from 89.52% to 91.12%.

关 键 词：EU-1分子筛 蔗糖 碳模板 多级孔 二甲苯异构化 催化 

分 类 号：TQ424.25[化学工程] O643.3[理学—物理化学]