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题名: Controllable growth of defect-free zeolite protective layer on the surface of Pd membrane for chemical stability enhancement
作者: Yu, Jiafeng1;  Zhang, Jixin1;  Bao, Chun1;  Zhang, Zhe1, 2;  Li, Hui1;  Xu, Hengyong1
关键词: Zeolite membrane synthesis ;  Protective layer ;  Pd membrane ;  Chemical stability ;  Hydrogen separation and purification
刊名: MICROPOROUS AND MESOPOROUS MATERIALS
发表日期: 2017-05-15
DOI: 10.1016/j.micromeso.2017.02.063
卷: 244, 页:119-126
收录类别: SCI
文章类型: Article
WOS标题词: Science & Technology ;  Physical Sciences ;  Technology
类目[WOS]: Chemistry, Applied ;  Chemistry, Physical ;  Nanoscience & Nanotechnology ;  Materials Science, Multidisciplinary
研究领域[WOS]: Chemistry ;  Science & Technology - Other Topics ;  Materials Science
英文摘要: Pd membranes play a critical role in hydrogen purification due to excellent hydrogen permeability and selectivity. However, the poor chemical stability of Pd membranes when exposed to inclusion gases or organic reactants severely restricts their commercial applications. Herein, a novel strategy is developed to synthesize a thin and compact zeolite layer on the surface of Pd membrane which acts as an "armor" to protect it from being damaged by poisoning species. The results show that the zeolite membrane was NaA type and defect-free when using Si/AI ratio of 7.5 and silica sol as Si source after two-step hydro thermal synthesis. The variations of H-2 permeance is monitored when Pd and zeolite-Pd composite membranes are exposed to 40% (ethanol/H2O) or 0.2% tetrahydrofuran (THF)/10% N-2 in hydrogen atmosphere. Reactions between ethanol and water on Pd active sites are undetected, indicating the reactants are completely out of contact with Pd membrane in the presence of zeolite protective layer. Especially, compared to pure Pd membrane, almost 80% H-2 permeance decline is constrained by the zeolite "armor" at 350 degrees C and W/E = 6. Moreover, the zeolite protective layer obviously enhances the chemical stability of Pd membrane by suppressing THE cracking and Pd active sites coverage. (C) 2017 Elsevier Inc. All rights reserved.
关键词[WOS]: ASYMMETRIC ALUMINA SUPPORTS ;  THIN-FILM MEMBRANE ;  MOLECULAR-SIEVE MEMBRANE ;  MASS-FLOW RESISTANCE ;  COMPOSITE MEMBRANE ;  SI/AL RATIO ;  SEPARATION PROPERTIES ;  HYDROGEN SEPARATION ;  SECONDARY GROWTH ;  FACILE SYNTHESIS
语种: 英语
WOS记录号: WOS:000399515500016
Citation statistics: 
内容类型: 期刊论文
URI标识: http://cas-ir.dicp.ac.cn/handle/321008/152328
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, Dalian, Peoples R China
2.Univ Chinese Acad Sci, Beijing, Peoples R China

Recommended Citation:
Yu, Jiafeng,Zhang, Jixin,Bao, Chun,et al. Controllable growth of defect-free zeolite protective layer on the surface of Pd membrane for chemical stability enhancement[J]. MICROPOROUS AND MESOPOROUS MATERIALS,2017,244:119-126.
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