Journal
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
Volume 141, Issue 23, Pages 9358-9364Publisher
AMER CHEMICAL SOC
DOI: 10.1021/jacs.9b03422
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Funding
- National Key R&D Program of China [2016YFB0301500]
- National Natural Science Foundation of China [21722609, 21436010]
- Zhejiang Provincial Natural Science Foundation of China [LR17B060001]
- Fundamental Research Funds for the Central Universities [2018XZZX002-14]
- Office of Basic Research, Energy Sciences of the U.S. Department of Energy [DE-FG02-08ER-46491]
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The efficient separation of xenon (Xe) and krypton (Kr) is one of the industrially important processes. While adsorptive separation of these two species is considered to be an energy efficient process, developing highly selective adsorbent remains challenging. Herein, a rigid squarate-based metal-organic framework (MOF), having a perfect pore size (4.1 angstrom x 4.3 angstrom) comparable with the kinetic diameter of Xe (4.047 angstrom) as well as pore surface decorated with very polar hydroxyl groups, is able to effectively discriminate Xe atoms, affording a record-high Xe/Kr selectivity. An exceptionally high Xe uptake capacity of 58.4 cm(3)/cm(3) and selectivity of 60.6 at low pressure (0.2 bar) are achieved at ambient temperature. The MOF exhibits the highest Xe Henry coefficient (192.1 mmol/g/bar) and Xe/Kr Henry selectivity (54.1) among all state-of-the-art adsorbents reported so far. Direct breakthrough experiments further confirm the excellent separation performance. The density functional theory calculations reveal that the strong interaction between Xe and the framework is a result of the synergy between optimal pore size and polar porosity.
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