文献类型：期刊文献

中文题名：MFI/MFI核壳分子筛的合成及催化性能研究

英文题名：Synthesis and Catalytic Behaviors of MFI/MFI Core-shell Zeolite

作者：孔德金[1,2];邹薇[2];童伟益[1];房鼎业[1]

机构：[1]华东理工大学化工学院,上海200237;[2]中国石油化工股份有限公司上海石油化工研究院,上海201208

年份：2009

卷号：67

期号：15

起止页码：1765

中文期刊名：化学学报

外文期刊名：Acta Chimica Sinica

收录：CSTPCD;;Scopus;WOS:【SCI-EXPANDED(收录号:WOS:000269347500010)】；北大核心:【北大核心2008】；CSCD:【CSCD2011_2012】；

基金：国家重点基础研究发展规划(973项目)(No.2003CB615802)资助项目

语种：中文

中文关键词：沸石分子筛;核壳结构;合成;甲苯甲基化

外文关键词：zeolite; core-shell structure; synthesis; toluene methylation

摘要：通过对核相ZSM-5的预处理步骤和在温和水热条件下的二次生长,合成了壳层硅铝比高、核相硅铝比低、纳米晶壳层致密的MFI(核)/MFI(壳)型核壳分子筛材料.考察了晶化温度和晶化时间对高硅壳层MFI/MFI核壳型沸石分子筛的合成的影响,其适宜的合成条件为晶化温度高于130℃,晶化时间19h.核相ZSM-5的预处理步骤对于成功合成此特殊核壳型分子筛材料十分关键.与普通ZSM-5沸石分子筛相比,MFI/MFI核壳分子筛在催化甲苯甲基化反应时的失活效率显著降低.
Hierarchical core/shell structures with low Si/Al ratio core and continuous shell of high Si/Al ra- tio ZSM-5 were successfully fabricated by a novel two-step procedure. The final products were character- ized by X-ray diffraction and scanning electron microscopy （SEM） methods to determine the morphologies and structural properties of the core/shell nanostructures. It was shown that MFI/MFI core-shell zeolite with high Si/Al shell could be synthesized by using ethylamine rather than TPAOH as organic template under mild hydrothermal conditions. It was achieved by in situ pre-seeding step on ZSM-5 cores and secondary growth of ZSM-5 shell on the modified ZSM-5 crystals, in which the pre-seeding step is a determining strategy during the synthesis. The MFI/MFI core-shell zeolite exhibited much lower deactivation rate than the core zeolite in the toluene methylation reaction.