Hybrid Ultra‐Microporous Materials for Selective Xenon Adsorption and Separation |
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| Authors: | Dr. Mona H. Mohamed Dr. Sameh K. Elsaidi Dr. Tony Pham Katherine A. Forrest Dr. Herbert T. Schaef Adam Hogan Dr. Lukasz Wojtas Dr. Wenqian Xu Prof. Dr. Brian Space Prof. Dr. Michael J. Zaworotko Dr. Praveen K. Thallapally |
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| Affiliation: | 1. Physical and Computational Science Directorate, Pacific Northwest National Laboratory, Richland, WA, USA;2. Chemistry Department, Faculty of Science, Alexandria University, Alexandria, Egypt;3. Department of Chemistry, University of South Florida, Tampa, FL, USA;4. X-ray Science Division, Advanced Photon Source, Argonne National Laboratory, Argonne, IL, USA;5. Department of Chemical & Environmental Sciences, University of Limerick, Limerick, Republic of Ireland |
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| Abstract: | The demand for Xe/Kr separation continues to grow due to the industrial significance of high‐purity Xe gas. Current separation processes rely on energy intensive cryogenic distillation. Therefore, less energy intensive alternatives, such as physisorptive separation, using porous materials, are required. Herein we show that an underexplored class of porous materials called hybrid ultra‐microporous materials (HUMs) affords new benchmark selectivity for Xe separation from Xe/Kr mixtures. The isostructural materials, CROFOUR‐1‐Ni and CROFOUR‐2‐Ni, are coordination networks that have coordinatively saturated metal centers and two distinct types of micropores, one of which is lined by CrO42? (CROFOUR) anions and the other is decorated by the functionalized organic linker. These nets offer unprecedented selectivity towards Xe. Modelling indicates that the selectivity of these nets is tailored by synergy between the pore size and the strong electrostatics afforded by the CrO42? anions. |
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| Keywords: | chromium hybrid ultra-microporous materials metal– organic frameworks separations xenon |
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