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Hybrid Ultra‐Microporous Materials for Selective Xenon Adsorption and Separation
Author(s) -
Mohamed Mona H.,
Elsaidi Sameh K.,
Pham Tony,
Forrest Katherine A.,
Schaef Herbert T.,
Hogan Adam,
Wojtas Lukasz,
Xu Wenqian,
Space Brian,
Zaworotko Michael J.,
Thallapally Praveen K.
Publication year - 2016
Publication title -
angewandte chemie
Language(s) - English
Resource type - Journals
eISSN - 1521-3757
pISSN - 0044-8249
DOI - 10.1002/ange.201602287
Subject(s) - microporous material , selectivity , isostructural , metal organic framework , gas separation , adsorption , porous medium , chemical engineering , selective adsorption , chemistry , materials science , porosity , nanotechnology , organic chemistry , catalysis , membrane , biochemistry , crystal structure , engineering
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 CrO 4 2− (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 CrO 4 2− anions.