期刊
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
卷 60, 期 16, 页码 9032-9037出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/anie.202100172
关键词
CHA zeolite; gas separation; krypton; membrane; xenon
资金
- National Natural Science Foundation of China [21908097, U1967215]
- Jiangsu Specially-Appointed Professors Program
- 333 Talent Project of Jiangsu Province, State Key Laboratory of Materials-Oriented Chemical Engineering [ZK202002]
High-silica CHA zeolite membranes exhibit ultra-high selectivity and irradiation stability for Kr/Xe separation, surpassing state-of-the-art polymeric membranes in terms of selectivity and permeance.
Capture and storage of the long-lived Kr-85 is an efficient approach to mitigate the emission of volatile radionuclides from the spent nuclear fuel reprocessing facilities. However, it is challenging to separate krypton (Kr) from xenon (Xe) because of the chemical inertness and similar physical properties. Herein we prepared high-silica CHA zeolite membranes with ultra-high selectivity and irradiation stability for Kr/Xe separation. The suitable aperture size and rigid framework endures the membrane a strong size-exclusion effect. The ultrahigh selectivity of 51-152 together with the Kr permeance of 0.7-1.3x10(-8) mol m(-2) s(-1) Pa-1 of high-silica CHA zeolite membranes far surpass the state-of-the-art polymeric membranes. The membrane is among the most stable polycrystalline membranes for separation of humid Kr/Xe mixtures. Together with the excellent irradiation stability, high-silica CHA zeolite membranes pave the way to separate radioactive Kr from Xe for a notable reduction of the volatile nuclear waste storage volume.
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