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题名: Formation mechanism of microwave synthesized LTA zeolite membranes
作者: Li, Yanshuo;  Liu, Jie;  Yang, Weishen
通讯作者: 杨维慎
关键词: LTA ;  zeolite membrane ;  microwave synthesis ;  formation mechanism ;  gas permeation
刊名: JOURNAL OF MEMBRANE SCIENCE
发表日期: 2006-09-15
DOI: 10.1016/j.memsci.2006.04.051
卷: 281, 期:1-2, 页:646-657
收录类别: SCI
文章类型: Article
部门归属: 5
项目归属: 504
产权排名: 1;1
WOS标题词: Science & Technology ;  Technology ;  Physical Sciences
类目[WOS]: Engineering, Chemical ;  Polymer Science
研究领域[WOS]: Engineering ;  Polymer Science
英文摘要: In order to optimize the synthesis conditions for a specific zeolite membrane with high efficiency, and generalize this method to other types of zeolite membranes, a fundamental understanding of the membrane formation mechanism is of great importance. In present paper, gravimetric analysis, X-ray diffraction (XRD), scanning electron microscopy (SEM), X-ray photoelectron spectroscopy (XPS), attenuated total reflectance/Fourier transform infrared spectroscopy (ATR/FTIR), and gas permeation were carried out to characterize the whole formation process of LTA zeolite membrane which was synthesized by "in situ aging-microwave heating" method (AM method), and the formation mechanism of LTA zeolite membrane was proposed. With this mechanism, a gel layer is first formed on the support after in situ aging, which contains plenty of pre-nuclei. During the following microwave assistant crystallization, these pre-nuclei rapidly and simultaneously develop into crystal nuclei, and then crystal growth by propagation through the amorphous primary particles (with size of ca. 50 nm) goes on, and finally, the amorphous particles transform into LTA crystal particles with the same size. This propagation growth process is followed by or parallel with the agglomeration and densification of the primary particles. In this way, compact LTA zeolite membrane consisting of sphere grains with undefined crystal facets is obtained. (c) 2006 Elsevier B.V. All rights reserved.
关键词[WOS]: MOLECULAR-SIEVE MEMBRANES ;  NAA MEMBRANE ;  ELECTRON-MICROSCOPY ;  ROOM-TEMPERATURE ;  SECONDARY GROWTH ;  IN-SITU ;  CRYSTALLIZATION ;  FILMS ;  ORIENTATION ;  SEPARATION
语种: 英语
原文出处: 查看原文
WOS记录号: WOS:000240207800069
Citation statistics: 
内容类型: 期刊论文
URI标识: http://cas-ir.dicp.ac.cn/handle/321008/97653
Appears in Collections:中国科学院大连化学物理研究所_期刊论文

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作者单位: 1.Chinese Acad Sci, Dalian Inst Chem Phys, State Key Lab Catalysis, Dalian 116023, Peoples R China
2.Chinese Acad Sci, Grad Sch, Dalian 116023, Peoples R China

Recommended Citation:
Li, Yanshuo,Liu, Jie,Yang, Weishen. Formation mechanism of microwave synthesized LTA zeolite membranes[J]. JOURNAL OF MEMBRANE SCIENCE,2006,281(1-2):646-657.
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