Balancing uptake and selectivity in a copper-based metal–organic framework for xenon and krypton separation

Chenghui Zhang, Xinglong Dong, Yongwei Chen, Houxiao Wu, Liang Yu, Kang Zhou, Ying Wu, Qibin Xia, Hao Wang, Yu Han, Jing Li

Research output: Contribution to journalArticlepeer-review

15 Scopus citations

Abstract

Efficient separation of Xenon (Xe) and krypton (Kr) is important in the gas industries but remains challenging. Adsorptive separation affords an energy-efficient method to isolate the two noble gases, yet developing selective adsorbents with high uptake and excellent selectivity remains difficult, limited by a trade-off between uptake and selectivity. We report MOF-11 with optimal pore size and accessible open metal sites (OMSs) for separation of Xe over Kr via the discriminable difference in van der Waals interactions. MOF-11 affords a new benchmark for Xe/Kr separation with high Xe uptakes of 4.05 and 4.95 mmol/g (at 0.2 and 1 bar), high Xe/Kr Henry and IAST selectivity (13.6 and 16.1) at 298 K. Evidenced by Xe-loaded structure, multiple Xe···H interactions between Xe and the terminal H atoms allow Xe atoms firmly packed within the framework. This work demonstrates a strategy for balancing uptake and selectivity in Xe/Kr separation by capitalizing on the synergy between optimal pore size and OMSs.
Original languageEnglish (US)
Pages (from-to)120932
JournalSeparation and Purification Technology
Volume291
DOIs
StatePublished - Mar 28 2022

Fingerprint

Dive into the research topics of 'Balancing uptake and selectivity in a copper-based metal–organic framework for xenon and krypton separation'. Together they form a unique fingerprint.

Cite this