Microstructural optimization of a zeolite membrane for organic vapor separation

被引:974
作者
Lai, ZP
Bonilla, G
Diaz, I
Nery, JG
Sujaoti, K
Amat, MA
Kokkoli, E
Terasaki, O
Thompson, RW
Tsapatsis, M [1 ]
Vlachos, DG
机构
[1] Univ Massachusetts, Dept Chem Engn, Amherst, MA 01003 USA
[2] Tohoku Univ, Grad Sch Sci, Dept Phys, Sendai, Miyagi 9808578, Japan
[3] Worcester Polytech Inst, Dept Chem Engn, Worcester, MA 01609 USA
[4] Univ Delaware, Dept Chem Engn, Newark, DE 19716 USA
关键词
D O I
10.1126/science.1082169
中图分类号
O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];
学科分类号
07 ; 0710 ; 09 ;
摘要
A seeded growth method for the fabrication of high-permeance, high-separation-factor zeolite (siliceous ZSM-5, [Si96O192]-MFI) membranes is reported. The method consists of growing the crystals of an oriented seed layer to a well-intergrown film by avoiding events that lead to a loss of preferred orientation, such as twin overgrowths and random nucleation. Organic polycations are used as zeolite crystal shape modifiers to enhance relative growth rates along the desirable out-of-plane direction. The polycrystalline films are thin (similar to1 micrometer) with single grains extending along the film thickness and with large in-plane grain size (similar to1 micrometer). The preferred orientation is such that straight channels with an open diameter of similar to5.5 angstroms run down the membrane thickness. Comparison with previously reported membranes shows that these microstructurally optimized films have superior performance for the separation of organic mixtures with components that have small differences in size and shape, such as xylene isomers.
引用
收藏
页码:456 / 460
页数:5
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