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Issue 31, 2016
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Selective gas capture via kinetic trapping

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Conventional approaches to the capture of CO2 by metal–organic frameworks focus on equilibrium conditions, and frameworks that contain little CO2 in equilibrium are often rejected as carbon-capture materials. Here we use a statistical mechanical model, parameterized by quantum mechanical data, to suggest that metal–organic frameworks can be used to separate CO2 from a typical flue gas mixture when used under nonequilibrium conditions. The origin of this selectivity is an emergent gas-separation mechanism that results from the acquisition by different gas types of different mobilities within a crowded framework. The resulting distribution of gas types within the framework is in general spatially and dynamically heterogeneous. Our results suggest that relaxing the requirement of equilibrium can substantially increase the parameter space of conditions and materials for which selective gas capture can be effected.

Graphical abstract: Selective gas capture via kinetic trapping

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The article was received on 07 Jun 2016, accepted on 13 Jul 2016 and first published on 13 Jul 2016

Article type: Paper
DOI: 10.1039/C6CP03940E
Citation: Phys. Chem. Chem. Phys., 2016,18, 21760-21766

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    Selective gas capture via kinetic trapping

    J. Kundu, T. Pascal, D. Prendergast and S. Whitelam, Phys. Chem. Chem. Phys., 2016, 18, 21760
    DOI: 10.1039/C6CP03940E

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