Krypton-xenon separation properties of SAPO-34 zeolite materials and membranes

Yeon Hye Kwon; Christine Kiang; Emily Benjamin; Phillip Crawford; Sankar Nair; Ramesh Bhave

doi:10.1002/aic.15434

Krypton-xenon separation properties of SAPO-34 zeolite materials and membranes

Yeon Hye Kwon, Christine Kiang, Emily Benjamin, Phillip Crawford, Sankar Nair, Ramesh Bhave

Soft Materials and Membranes

Research output: Contribution to journal › Article › peer-review

41 Scopus citations

Abstract

Separation of the radioisotope⁸⁵Kr from¹³⁶Xe is an important target during used nuclear fuel recycling. We report a detailed study on the Kr and Xe adsorption, diffusion, and membrane permeation properties of the silicoaluminophosphate zeolite SAPO-34. Adsorption and diffusion measurements on SAPO-34 crystals indicate their potential for use in Kr-Xe separation membranes, but also highlight competing effects of adsorption and diffusion selectivity. SAPO-34 membranes are synthesized on α−alumina disk and tubular substrates via steam assisted conversion seeding and hydrothermal growth, and are characterized in detail. Membrane transport measurements reveal that SAPO-34 membranes can separate Kr from Xe by molecular sieving, with Kr permeabilities around 50 Barrer and mixture selectivity of 25–30 for Kr at ambient or slight sub-ambient conditions. The membrane transport characteristics are modeled by the Maxwell-Stefan equations, whose predictions are in very good agreement with experiment and confirm the minimal competing effects of adsorption and diffusion.

Original language	English
Pages (from-to)	761-769
Number of pages	9
Journal	AIChE Journal
Volume	63
Issue number	2
DOIs	https://doi.org/10.1002/aic.15434
State	Published - Feb 1 2017

Funding

This work was supported by the Department of Energy Office of Nuclear Energy (grant number DE-NE 0008298). We are grateful to Dr. R. Jubin, Dr. G. Del Cul, and Dr. E. Collins (all ORNL) for useful discussions, K. Eum and Dr. S. Yang (Georgia Tech) for their assistance in setting up permeation measurements, and V. Pisharodi and J. Hwang (Georgia Tech) for their assistance in adsorption measurements.

Funders	Funder number
Office of Nuclear Energy	DE-NE 0008298

Keywords

SAPO-34
gas separation
krypton
xenon
zeolite membrane

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title = "Krypton-xenon separation properties of SAPO-34 zeolite materials and membranes",

abstract = "Separation of the radioisotope85Kr from136Xe is an important target during used nuclear fuel recycling. We report a detailed study on the Kr and Xe adsorption, diffusion, and membrane permeation properties of the silicoaluminophosphate zeolite SAPO-34. Adsorption and diffusion measurements on SAPO-34 crystals indicate their potential for use in Kr-Xe separation membranes, but also highlight competing effects of adsorption and diffusion selectivity. SAPO-34 membranes are synthesized on α−alumina disk and tubular substrates via steam assisted conversion seeding and hydrothermal growth, and are characterized in detail. Membrane transport measurements reveal that SAPO-34 membranes can separate Kr from Xe by molecular sieving, with Kr permeabilities around 50 Barrer and mixture selectivity of 25–30 for Kr at ambient or slight sub-ambient conditions. The membrane transport characteristics are modeled by the Maxwell-Stefan equations, whose predictions are in very good agreement with experiment and confirm the minimal competing effects of adsorption and diffusion.",

keywords = "SAPO-34, gas separation, krypton, xenon, zeolite membrane",

author = "{Hye Kwon}, Yeon and Christine Kiang and Emily Benjamin and Phillip Crawford and Sankar Nair and Ramesh Bhave",

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T1 - Krypton-xenon separation properties of SAPO-34 zeolite materials and membranes

AU - Hye Kwon, Yeon

AU - Kiang, Christine

AU - Benjamin, Emily

AU - Crawford, Phillip

AU - Nair, Sankar

AU - Bhave, Ramesh

PY - 2017/2/1

Y1 - 2017/2/1

N2 - Separation of the radioisotope85Kr from136Xe is an important target during used nuclear fuel recycling. We report a detailed study on the Kr and Xe adsorption, diffusion, and membrane permeation properties of the silicoaluminophosphate zeolite SAPO-34. Adsorption and diffusion measurements on SAPO-34 crystals indicate their potential for use in Kr-Xe separation membranes, but also highlight competing effects of adsorption and diffusion selectivity. SAPO-34 membranes are synthesized on α−alumina disk and tubular substrates via steam assisted conversion seeding and hydrothermal growth, and are characterized in detail. Membrane transport measurements reveal that SAPO-34 membranes can separate Kr from Xe by molecular sieving, with Kr permeabilities around 50 Barrer and mixture selectivity of 25–30 for Kr at ambient or slight sub-ambient conditions. The membrane transport characteristics are modeled by the Maxwell-Stefan equations, whose predictions are in very good agreement with experiment and confirm the minimal competing effects of adsorption and diffusion.

AB - Separation of the radioisotope85Kr from136Xe is an important target during used nuclear fuel recycling. We report a detailed study on the Kr and Xe adsorption, diffusion, and membrane permeation properties of the silicoaluminophosphate zeolite SAPO-34. Adsorption and diffusion measurements on SAPO-34 crystals indicate their potential for use in Kr-Xe separation membranes, but also highlight competing effects of adsorption and diffusion selectivity. SAPO-34 membranes are synthesized on α−alumina disk and tubular substrates via steam assisted conversion seeding and hydrothermal growth, and are characterized in detail. Membrane transport measurements reveal that SAPO-34 membranes can separate Kr from Xe by molecular sieving, with Kr permeabilities around 50 Barrer and mixture selectivity of 25–30 for Kr at ambient or slight sub-ambient conditions. The membrane transport characteristics are modeled by the Maxwell-Stefan equations, whose predictions are in very good agreement with experiment and confirm the minimal competing effects of adsorption and diffusion.

KW - SAPO-34

KW - gas separation

KW - krypton

KW - xenon

KW - zeolite membrane

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DO - 10.1002/aic.15434

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JO - AIChE Journal

JF - AIChE Journal

IS - 2

ER -

Krypton-xenon separation properties of SAPO-34 zeolite materials and membranes

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