文献类型：期刊文献

中文题名：核壳型复合分子筛ZSM-5／Nano-β的合成与表征

英文题名：Synthesis and Characterization of ZSM-5/Nano-β Core-Shell Composite-Zeolites

作者：童伟益[1];刘志成[2];孔德金[2];祁晓岚[2];郭杨龙[1]

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

年份：2009

卷号：30

期号：5

起止页码：959

中文期刊名：高等学校化学学报

外文期刊名：Chemical Journal of Chinese Universities

收录：CSTPCD;;Scopus;WOS:【SCI-EXPANDED(收录号:WOS:000266417200024)】；北大核心:【北大核心2008】；CSCD:【CSCD2011_2012】；

基金：国家“九七三”计划(批准号:2009CB623501)资助

语种：中文

中文关键词：ZSM-5分子筛;纳米β分子筛;核壳复合分子筛;阳离子聚电解质;硅源

外文关键词：ZSM-5 zeolite ; Nano-β zeolite ; Core-shell ; Cationic polyelectrolyte ; Silica source

摘要：以ZSM-5小晶粒为核相材料,用聚二烯丙基二甲基氯化铵(PDDA)进行表面预处理后,黏附nano-β晶种并焙烧制得核相晶种,再在壳层晶化生长体系中通过水热合成得到ZSM-5/nano-β有序的核壳分子筛.产物的物相和结构通过XRD,SEM,TEM以及N2吸附/脱附分析表征,通过对比发现,β壳层的合成以白炭黑为硅源比用正硅酸乙酯(TEOS)更好.通过NH3-TPD表征,以及1,3,5-三甲苯裂化转化反应对分子筛的性能进行了考察,结果表明,核壳分子筛通过调变组成分子筛的酸性,从而大大提高了材料的催化裂化性能,同时延缓了失活速率.
ZSM-5/nano-β core-shell composite-zeolites were hydrothermally synthesized by a secondary growth on core ZSM-5 with a uniform size of 1 μm, which was pre-adsorbed with nano-β seeds after pretreated with positive PDDA （poly dimethyldiallylammonium chloride） , and then was calcined in air. The obtained products were characterized by XRD, SEM/TEM, and N2 sorption analysis, which demonstrated the formation of ordered core-shell structure. The results proved the formation of composite-zeolites with a ZSM-5 core （ca. 82% ） and a poly-nano-β shell（ ca. 18% ）. The coverage of shell was tested via S external measurements of the products, and the core ZSM-5 showed a more compact shell with fumed silica rather than TEOS as the silica source. Moreover, tested by NH3-TPD and probe reactions on 1,3,5-TMB cracking, it is found that the surface acidity changed after the growth of nano-fl layer, and the formed ZSM-5/nano-β has a better catalytic performance（ca. 80% conversion） and lower deactivation rate.