Zeolitic Imidazolate Framework-8 (ZIF-8) Membranes for Kr/Xe Separation

被引：73

作者：

Wu, Ting ^{[1
]}

Feng, Xuhui ^{[1
]}

Eisaidi, Sameh K. ^{[2
]}

Thallapally, Praveen K. ^{[2
]}

Carreon, Moises A. ^{[1
]}

机构：

[1] Colorado Sch Mines, Dept Chem & Biol Engn, Golden, CO 80401 USA

[2] Pacific Northwest Natl Lab, Richland, WA 99352 USA

来源：

INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH | 2017年 / 56卷 / 06期

关键词：

METAL-ORGANIC FRAMEWORKS; IN-SITU SYNTHESIS; NOBLE-GASES; ADSORPTION; XENON; KR; XE; KRYPTON; FORMATE; FILMS;

D O I：

10.1021/acs.iecr.6b04868

中图分类号：

TQ [化学工业];

学科分类号：

0817 ;

摘要：

Herein, we demonstrate that a prototypical type of metal organic framework, zeolitic imidazolate framework-8 (ZIF-8), in membrane form, can effectively separate Kr/Xe gas mixtures at industrially relevant compositions. The best membranes separated Kr/Xe mixtures with average Kr permeances as high as 1.5 x 10(-8) +/- 0.2 mol/m(2) s Pa and average separation selectivities of 14.2 +/- 1.9 for molar feed compositions corresponding to Kr/Xe ratio encountered typically in air. Molecular sieving, competitive adsorption, and differences in diffusivities were identified as the prevailing separation mechanisms. These membranes potentially represent a less-energy-intensive alternative to cryogenic distillation, which is the benchmark technology used to separate this challenging gas mixture. To our best knowledge, this is the first example of any metal organic membrane composition displaying separation ability for Kr/Xe gas mixtures.

引用

页码：1682 / 1686

页数：5

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