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Title: Ion-Exchanged SAPO-34 membranes for Krypton-Xenon Separation: Control of Permeation Properties and Fabrication of Hollow Fiber Membranes

Abstract

Separation of radioisotope 85Kr from 136Xe is of importance in used nuclear fuel reprocessing. Membrane separation based on zeolite molecular sieves such as chabazite SAPO- 34 is an attractive alternative to energy-intensive cryogenic distillation. We report the synthesis of SAPO-34 membranes with considerably enhanced performance, via thickness reduction based upon control of a steam-assisted vapor-solid conversion technique followed by ion exchange with alkali metal cations. The reduction of membrane thickness leads to a large increase in Kr permeance from 7.5 gas permeation units (GPU) to 26.3 GPU with ideal Kr/Xe selectivities > 20 at 298 K. Cation-exchanged membranes show large (>50%) increases in selectivity at ambient or slight sub-ambient conditions. The adsorption, diffusion, and permeation characteristics of ionexchanged SAPO-34 materials and membranes are investigated in detail, with potassium exchanged SAPO-34 membranes showing particularly attractive performance. Lastly, we then demonstrate the fabrication of selective SAPO-34 membranes on α-alumina hollow fibers.

Authors:
 [1];  [1];  [1];  [1];  [2];  [1]
  1. Georgia Inst. of Technology, Atlanta, GA (United States)
  2. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Publication Date:
Research Org.:
Georgia Institute of Technology, Atlanta, GA (United States)
Sponsoring Org.:
USDOE Office of Nuclear Energy (NE)
OSTI Identifier:
1418424
Grant/Contract Number:  
NE0008298
Resource Type:
Journal Article: Accepted Manuscript
Journal Name:
ACS Applied Materials and Interfaces
Additional Journal Information:
Journal Volume: 10; Journal Issue: 7; Journal ID: ISSN 1944-8244
Publisher:
American Chemical Society (ACS)
Country of Publication:
United States
Language:
English
Subject:
11 NUCLEAR FUEL CYCLE AND FUEL MATERIALS; fuel cycle; off-gas; membrane; krypton; separation; zeolite

Citation Formats

Kwon, Yeon Hye, Min, Byunghyun, Yang, Shaowei, Koh, Dong -Yeun, Bhave, Ramesh R., and Nair, Sankar. Ion-Exchanged SAPO-34 membranes for Krypton-Xenon Separation: Control of Permeation Properties and Fabrication of Hollow Fiber Membranes. United States: N. p., 2018. Web. doi:10.1021/acsami.7b18244.
Kwon, Yeon Hye, Min, Byunghyun, Yang, Shaowei, Koh, Dong -Yeun, Bhave, Ramesh R., & Nair, Sankar. Ion-Exchanged SAPO-34 membranes for Krypton-Xenon Separation: Control of Permeation Properties and Fabrication of Hollow Fiber Membranes. United States. https://doi.org/10.1021/acsami.7b18244
Kwon, Yeon Hye, Min, Byunghyun, Yang, Shaowei, Koh, Dong -Yeun, Bhave, Ramesh R., and Nair, Sankar. 2018. "Ion-Exchanged SAPO-34 membranes for Krypton-Xenon Separation: Control of Permeation Properties and Fabrication of Hollow Fiber Membranes". United States. https://doi.org/10.1021/acsami.7b18244. https://www.osti.gov/servlets/purl/1418424.
@article{osti_1418424,
title = {Ion-Exchanged SAPO-34 membranes for Krypton-Xenon Separation: Control of Permeation Properties and Fabrication of Hollow Fiber Membranes},
author = {Kwon, Yeon Hye and Min, Byunghyun and Yang, Shaowei and Koh, Dong -Yeun and Bhave, Ramesh R. and Nair, Sankar},
abstractNote = {Separation of radioisotope 85Kr from 136Xe is of importance in used nuclear fuel reprocessing. Membrane separation based on zeolite molecular sieves such as chabazite SAPO- 34 is an attractive alternative to energy-intensive cryogenic distillation. We report the synthesis of SAPO-34 membranes with considerably enhanced performance, via thickness reduction based upon control of a steam-assisted vapor-solid conversion technique followed by ion exchange with alkali metal cations. The reduction of membrane thickness leads to a large increase in Kr permeance from 7.5 gas permeation units (GPU) to 26.3 GPU with ideal Kr/Xe selectivities > 20 at 298 K. Cation-exchanged membranes show large (>50%) increases in selectivity at ambient or slight sub-ambient conditions. The adsorption, diffusion, and permeation characteristics of ionexchanged SAPO-34 materials and membranes are investigated in detail, with potassium exchanged SAPO-34 membranes showing particularly attractive performance. Lastly, we then demonstrate the fabrication of selective SAPO-34 membranes on α-alumina hollow fibers.},
doi = {10.1021/acsami.7b18244},
url = {https://www.osti.gov/biblio/1418424}, journal = {ACS Applied Materials and Interfaces},
issn = {1944-8244},
number = 7,
volume = 10,
place = {United States},
year = {2018},
month = {1}
}

Journal Article:
Free Publicly Available Full Text
Publisher's Version of Record

Citation Metrics:
Cited by: 4 works
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Figures / Tables:

Figure 1 Figure 1: Example surface and cross-sectional SEM images of M1 (a, c) and M2 (b, d) membranes, and (e,f) the corresponding cross-sectional P/Al ratio profiles of each membrane as determined by EDX analysis. The yellow lines define the thickness of the membrane.

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Works referenced in this record:

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