Balancing uptake and selectivity in a copper-based metal–organic framework for xenon and krypton separation
KAUST DepartmentNanostructured Functional Materials (NFM) laboratory
Advanced Membranes and Porous Materials Research Center
Chemical Science Program
Physical Science and Engineering (PSE) Division
Permanent link to this recordhttp://hdl.handle.net/10754/676285
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AbstractEfficient 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.
CitationZhang, C., Dong, X., Chen, Y., Wu, H., Yu, L., Zhou, K., Wu, Y., Xia, Q., Wang, H., Han, Y., & Li, J. (2022). Balancing uptake and selectivity in a copper-based metal–organic framework for xenon and krypton separation. Separation and Purification Technology, 291, 120932. https://doi.org/10.1016/j.seppur.2022.120932
SponsorsThe authors gratefully acknowledge support from the National Natural Science Foundation of China (Nos. 22108141, 21878101, 21808067, 21706031), Natural Science Foundation of Shandong Province (ZR2021QB013 and ZR2020QB033), Guangdong Natural Science Foundation (2019A1515010692), China Postdoctoral Science Foundation (2018 M640785), Guangdong Basic and Applied Basic Research Foundation (2019A1515011512, 2021A1515010172).
Y. Han acknowledges the King Abdullah University of Science and Technology (KAUST) fund for the breakthrough experiments.