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Title: Kr/Xe Separation over a Chabazite Zeolite Membrane

Abstract

Cryogenic distillation, the current conventional technology to separate Krypton and Xenon from air, and from nuclear reprocessing technologies, is an energy-intensive and expensive process. Membrane technology could potentially make this challenging industrial separation less energy intensive and economically viable. We demonstrate that chabazite zeolite SAPO-34 membranes effectively separated Kr/Xe gas mixtures at industrially relevant compositions. Control over membrane thickness and average crystal size led to industrial range permeances and high separation selectivities. Specifically, SAPO-34 membranes can separate Kr/Xe mixtures with Kr permeances as high as 361.4 GPU and separation selectivities of 34.8 for molar compositions close to typical concentrations of these two gases in air. In addition, SAPO-34 membranes separated Kr/Xe mixtures with Kr permeances as high as 525.7 GPU and separation selectivities up to 45.1 for molar compositions as might be encountered in nuclear reprocessing technologies. Molecular sieving and differences in diffusivities were identified as the dominant separation mechanisms.

Authors:
; ; ; ; ; ;
Publication Date:
Research Org.:
Pacific Northwest National Lab. (PNNL), Richland, WA (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
1355102
Report Number(s):
PNNL-SA-121268
Journal ID: ISSN 0002-7863; 830403000
DOE Contract Number:
AC05-76RL01830
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of the American Chemical Society; Journal Volume: 138; Journal Issue: 31
Country of Publication:
United States
Language:
English

Citation Formats

Feng, Xuhui, Zong, Zhaowang, Elsaidi, Sameh K., Jasinski, Jacek B., Krishna, Rajamani, Thallapally, Praveen K., and Carreon, Moises A. Kr/Xe Separation over a Chabazite Zeolite Membrane. United States: N. p., 2016. Web. doi:10.1021/jacs.6b06515.
Feng, Xuhui, Zong, Zhaowang, Elsaidi, Sameh K., Jasinski, Jacek B., Krishna, Rajamani, Thallapally, Praveen K., & Carreon, Moises A. Kr/Xe Separation over a Chabazite Zeolite Membrane. United States. doi:10.1021/jacs.6b06515.
Feng, Xuhui, Zong, Zhaowang, Elsaidi, Sameh K., Jasinski, Jacek B., Krishna, Rajamani, Thallapally, Praveen K., and Carreon, Moises A. Wed . "Kr/Xe Separation over a Chabazite Zeolite Membrane". United States. doi:10.1021/jacs.6b06515.
@article{osti_1355102,
title = {Kr/Xe Separation over a Chabazite Zeolite Membrane},
author = {Feng, Xuhui and Zong, Zhaowang and Elsaidi, Sameh K. and Jasinski, Jacek B. and Krishna, Rajamani and Thallapally, Praveen K. and Carreon, Moises A.},
abstractNote = {Cryogenic distillation, the current conventional technology to separate Krypton and Xenon from air, and from nuclear reprocessing technologies, is an energy-intensive and expensive process. Membrane technology could potentially make this challenging industrial separation less energy intensive and economically viable. We demonstrate that chabazite zeolite SAPO-34 membranes effectively separated Kr/Xe gas mixtures at industrially relevant compositions. Control over membrane thickness and average crystal size led to industrial range permeances and high separation selectivities. Specifically, SAPO-34 membranes can separate Kr/Xe mixtures with Kr permeances as high as 361.4 GPU and separation selectivities of 34.8 for molar compositions close to typical concentrations of these two gases in air. In addition, SAPO-34 membranes separated Kr/Xe mixtures with Kr permeances as high as 525.7 GPU and separation selectivities up to 45.1 for molar compositions as might be encountered in nuclear reprocessing technologies. Molecular sieving and differences in diffusivities were identified as the dominant separation mechanisms.},
doi = {10.1021/jacs.6b06515},
journal = {Journal of the American Chemical Society},
number = 31,
volume = 138,
place = {United States},
year = {Wed Aug 10 00:00:00 EDT 2016},
month = {Wed Aug 10 00:00:00 EDT 2016}
}