微型多孔材料
沸石
膜
晶界
分子筛
材料科学
化学工程
选择性
筛子(范畴论)
吸附
分子
催化作用
化学
有机化学
复合材料
微观结构
组合数学
工程类
生物化学
数学
作者
Jungkyu Choi,Hae-Kwon Jeong,Mark A. Snyder,Jared A. Stoeger,Richard I. Masel,Michael Tsapatsis
出处
期刊:Science
[American Association for the Advancement of Science (AAAS)]
日期:2009-07-30
卷期号:325 (5940): 590-593
被引量:298
标识
DOI:10.1126/science.1176095
摘要
Microporous molecular sieve catalysts and adsorbents discriminate molecules on the basis of size and shape. Interest in molecular sieve films stems from their potential for energy-efficient membrane separations. However, grain boundary defects, formed in response to stresses induced by heat treatment, compromise their selectivity by creating nonselective transport pathways for permeating molecules. We show that rapid thermal processing can improve the separation performance of thick columnar films of a certain zeolite (silicalite-1) by eliminating grain boundary defects, possibly by strengthening grain bonding at the grain boundaries. This methodology enables the preparation of silicalite-1 membranes with high separation performance for aromatic and linear versus branched hydrocarbon isomers and holds promise for realizing high-throughput and scalable production of these zeolite membranes with improved energy efficiency.
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