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

Abstract

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 × 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.

Authors:
; ; ; ; ORCiD logo
Publication Date:
Research Org.:
Pacific Northwest National Lab. (PNNL), Richland, WA (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
1353338
Report Number(s):
PNNL-SA-125555
Journal ID: ISSN 0888-5885; 830403000
DOE Contract Number:  
AC05-76RL01830
Resource Type:
Journal Article
Resource Relation:
Journal Name: Industrial and Engineering Chemistry Research; Journal Volume: 56; Journal Issue: 6
Country of Publication:
United States
Language:
English
Subject:
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY

Citation Formats

Wu, Ting, Feng, Xuhui, Elsaidi, Sameh K., Thallapally, Praveen K., and Carreon, Moises A.. Zeolitic Imidazolate Framework-8 (ZIF-8) Membranes for Kr/Xe Separation. United States: N. p., 2017. Web. doi:10.1021/acs.iecr.6b04868.
Wu, Ting, Feng, Xuhui, Elsaidi, Sameh K., Thallapally, Praveen K., & Carreon, Moises A.. Zeolitic Imidazolate Framework-8 (ZIF-8) Membranes for Kr/Xe Separation. United States. doi:10.1021/acs.iecr.6b04868.
Wu, Ting, Feng, Xuhui, Elsaidi, Sameh K., Thallapally, Praveen K., and Carreon, Moises A.. Mon . "Zeolitic Imidazolate Framework-8 (ZIF-8) Membranes for Kr/Xe Separation". United States. doi:10.1021/acs.iecr.6b04868.
@article{osti_1353338,
title = {Zeolitic Imidazolate Framework-8 (ZIF-8) Membranes for Kr/Xe Separation},
author = {Wu, Ting and Feng, Xuhui and Elsaidi, Sameh K. and Thallapally, Praveen K. and Carreon, Moises A.},
abstractNote = {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 × 10-8 ± 0.2 mol/m2 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.},
doi = {10.1021/acs.iecr.6b04868},
journal = {Industrial and Engineering Chemistry Research},
number = 6,
volume = 56,
place = {United States},
year = {Mon Jan 30 00:00:00 EST 2017},
month = {Mon Jan 30 00:00:00 EST 2017}
}