文献类型：期刊文献

中文题名：ZSM-5/Silicalite-1核壳分子筛含氟水热体系的合成及表征

英文题名：Synthesis and Characterization of ZSM-5/Silicalite-1 Core-Shell Zeolite with a Fluoride-Containing Hydrothermal System

作者：童伟益[1];孔德金[1,2,3];刘志成[2];郭杨龙[1];房鼎业[3]

机构：[1]结构可控先进功能材料及其制备教育部重点实验室,华东理工大学工业催化研究所,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;[3]华东理工大学化工学院,化学工程国家重点实验室,上海200237

年份：2008

卷号：29

期号：12

起止页码：1247

中文期刊名：催化学报

外文期刊名：CHINESE JOURNAL OF CATALYSIS

收录：CSTPCD;;Scopus;WOS:【SCI-EXPANDED(收录号:WOS:000262385100012)】；北大核心:【北大核心2004】；CSCD:【CSCD2011_2012】；

基金：国家重点基础研究发展计划(973计划;2003CB615802)

语种：中文

中文关键词：核壳;ZSM-5;silicalite-1;外延共生;二次生长;氟化物

外文关键词：core-shell; ZSM-5; silicalite-1 ; intergrowth; secondary growth; fluoride

摘要：以圆柱形ZSM-5为核,用柠檬酸对其外表面进行预处理后,在含氟壳层晶化体系中二次生长合成核壳分子筛.通过X射线衍射、扫描电镜、透射电镜、N2吸附及氨程序升温脱附对分子筛进行了表征,并以甲苯歧化和1,3,5-三甲苯裂化为探针反应对分子筛性能进行了考察.结果显示,产物是以ZSM-5为核、silicalite-1纳米晶为壳的两相复合微孔分子筛材料;在含氟体系中ZSM-5外延生长出了致密壳层;全硅壳层的覆盖度约达到97%,核壳分子筛的外表面酸位随之减少,但基本保持孔道内的酸性。
Cylindrical ZSM-5 was used as a core material, then its surface was pretreated with citric acid, and finally a secondary growth was performed in a system containing fluoride to form core-shell zeolite. The obtained products were characterized by XRD, SEM, TEM, N2 adsorption, and NH3-TPD. The performance was investigated by probe reactions of toluene disproportionation and 1,3,5-trimethyl benzene cracking. The results obtained proved the formation of a micro-composite with a ZSM-5 core and a polynano-silicalite-1 shell. The core ZSM-5 showed a compact shell by intergrowth in a fluoride way. The silicalite-1 shell almost reached 97 % coverage with a decreased surface acidity and a preservation of the original channel acidity.