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Title: Microporous Crystalline Membranes for Kr/Xe Separation: Comparison between AlPO-18, SAPO-34, and ZIF-8

Abstract

Herein we demonstrate the separation ability of AlPO-18 membranes for Kr/Xe gas mixtures. AlPO-18 membranes separated Kr/Xe mixtures with average Kr/Xe separation selectivity of 6.4 and unprecedented high average Kr permeance of 1.6 × 10-7 mol/m2·s·Pa. Diffusivity difference between Kr and Xe was identified as the dominant separation mechanism. We compared the separation performance of AlPO-18 membranes versus two other types of microporous crystalline membranes, namely, SAPO-34 and ZIF-8. SAPO-34 membranes displayed the best overall separation performance, while AlPO-18 membranes displayed the highest Kr permeances. We identified the key factors affecting both the separation selectivity and permeance. For these three distinctive types of microporous materials, the presence of rigid micropores with size lying between Kr and Xe atomic sizes, lower Xe/Kr uptakes (adsorption selectivity), and lower concentration of nonselective pores led to the highest observed s Kr/Xe separation selectivities among these three microporous crystals. The Kr permeances for these three microporous crystalline membranes decreased exponentially as membrane thickness increased.

Authors:
 [1];  [1];  [1];  [2]; ORCiD logo [3];  [1]
  1. Colorado School Of Mines
  2. UNIVERSITY PROGRAMS
  3. BATTELLE (PACIFIC NW LAB)
Publication Date:
Research Org.:
Pacific Northwest National Lab. (PNNL), Richland, WA (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
1581965
Report Number(s):
PNNL-SA-136458
DOE Contract Number:  
AC05-76RL01830
Resource Type:
Journal Article
Journal Name:
ACS Applied Nano Materials
Additional Journal Information:
Journal Volume: 1; Journal Issue: 1
Country of Publication:
United States
Language:
English
Subject:
microporous crystals, membranes, gas separations, krypton

Citation Formats

Wu, Ting, Lucero, Jolie, Zong, Zhaowang, Elsaidi, Sameh K., Thallapally, Praveen K., and Carreon, Moises A.. Microporous Crystalline Membranes for Kr/Xe Separation: Comparison between AlPO-18, SAPO-34, and ZIF-8. United States: N. p., 2018. Web. doi:10.1021/acsanm.7b00343.
Wu, Ting, Lucero, Jolie, Zong, Zhaowang, Elsaidi, Sameh K., Thallapally, Praveen K., & Carreon, Moises A.. Microporous Crystalline Membranes for Kr/Xe Separation: Comparison between AlPO-18, SAPO-34, and ZIF-8. United States. https://doi.org/10.1021/acsanm.7b00343
Wu, Ting, Lucero, Jolie, Zong, Zhaowang, Elsaidi, Sameh K., Thallapally, Praveen K., and Carreon, Moises A.. Fri . "Microporous Crystalline Membranes for Kr/Xe Separation: Comparison between AlPO-18, SAPO-34, and ZIF-8". United States. https://doi.org/10.1021/acsanm.7b00343.
@article{osti_1581965,
title = {Microporous Crystalline Membranes for Kr/Xe Separation: Comparison between AlPO-18, SAPO-34, and ZIF-8},
author = {Wu, Ting and Lucero, Jolie and Zong, Zhaowang and Elsaidi, Sameh K. and Thallapally, Praveen K. and Carreon, Moises A.},
abstractNote = {Herein we demonstrate the separation ability of AlPO-18 membranes for Kr/Xe gas mixtures. AlPO-18 membranes separated Kr/Xe mixtures with average Kr/Xe separation selectivity of 6.4 and unprecedented high average Kr permeance of 1.6 × 10-7 mol/m2·s·Pa. Diffusivity difference between Kr and Xe was identified as the dominant separation mechanism. We compared the separation performance of AlPO-18 membranes versus two other types of microporous crystalline membranes, namely, SAPO-34 and ZIF-8. SAPO-34 membranes displayed the best overall separation performance, while AlPO-18 membranes displayed the highest Kr permeances. We identified the key factors affecting both the separation selectivity and permeance. For these three distinctive types of microporous materials, the presence of rigid micropores with size lying between Kr and Xe atomic sizes, lower Xe/Kr uptakes (adsorption selectivity), and lower concentration of nonselective pores led to the highest observed s Kr/Xe separation selectivities among these three microporous crystals. The Kr permeances for these three microporous crystalline membranes decreased exponentially as membrane thickness increased.},
doi = {10.1021/acsanm.7b00343},
url = {https://www.osti.gov/biblio/1581965}, journal = {ACS Applied Nano Materials},
number = 1,
volume = 1,
place = {United States},
year = {2018},
month = {1}
}