A seed surface crystallization approach for rapid synthesis of submicron ZSM-5 zeolite with controllable crystal size and morphology

被引:133
作者
Ren, Nan
Yang, Zhi-Jian
Lv, Xin-Chun
Shi, Jing
Zhang, Ya-Hong
Tang, Yi [1 ]
机构
[1] Fudan Univ, Dept Chem, Shanghai Key Lab Mol Catalysis & Innovat Mat, Shanghai 200433, Peoples R China
关键词
Zeolite; Crystal size; Morphology; Adjustment; Mechanism; MICROWAVE SYNTHESIS; SHAPE SELECTIVITY; GROWTH; NUCLEATION; MECHANISM; TRANSFORMATION; SILICALITE-1; TEMPERATURE; PERFORMANCE; PARTICLES;
D O I
10.1016/j.micromeso.2009.12.009
中图分类号
O69 [应用化学];
学科分类号
081704 ;
摘要
A method based on seed surface crystallization (SSC) mechanism has been proposed for facile, rapid, controllable and low-cost synthesis of ZSM-5 zeolite with submicron-size and interesting core-shell structure. The crystallization process of the ZSM-5 zeolite with all sizes can be accomplished within 2.5 h. The morphology and size of zeolite ZSM-5 products can both be facilely adjustable in the domain of 270-1100 nm depending upon the characters of silicalite-1 seeds, while the thickness of aluminum-containing zeolite ZSM-5 shells can be well tuned by changing the amount of silicalite-1 seed. More interestingly, the siliceous silicalite-1 seeds within the obtained zeolite crystals could be selectively removed by alkaline treatment. By systematically tracking the crystallization process combined with mathematical analysis, the crystallization of ZSM-5 zeolites in the reaction system is revealed as SSC mechanism with a size-independent, linear growth process. Their crystal growth rate is calculated as c.a. 0.15 mu m h(-1) regardless of the seed size and amount. Crown Copyright (C) 2009 Published by Elsevier Inc. All rights reserved.
引用
收藏
页码:103 / 114
页数:12
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