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- Title
Krypton-xenon separation properties of SAPO-34 zeolite materials and membranes.
- Authors
Hye Kwon, Yeon; Kiang, Christine; Benjamin, Emily; Crawford, Phillip; Nair, Sankar; Bhave, Ramesh
- Abstract
Separation of the radioisotope 85Kr from 136Xe 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. © 2016 American Institute of Chemical Engineers AIChE J, 63: 761-769, 2017
- Subjects
ISOTOPE separation; KRYPTON isotopes; XENON isotopes; RADIOISOTOPES; ZEOLITE absorption &; adsorption; MOLECULAR sieve synthesis
- Publication
AIChE Journal, 2017, Vol 63, Issue 2, p761
- ISSN
0001-1541
- Publication type
Article
- DOI
10.1002/aic.15434