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Issue 10, 2019
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Lewis acidic water as a new carrier for facilitating CO2 transport

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We report the formation of a reversible complex between CO2 and a bound water coordinating alkaline metal cation (Lewis-acidic water) by nuclear magnetic resonance (NMR) analysis for the first time. Such a unique property of water can facilitate CO2 permeation by offering an additional carrier-mediated pathway, which is distinct from the commonly recognized bicarbonate or carbonate ion-mediated CO2 transport. These findings were exploited to develop an advanced polymeric membrane for separating CO2 directly from wet flue gases. A simply prepared poly(ethylene oxide)-based membrane containing potassium salts exhibits selective super-permeable characteristics for CO2 in humid environments; an exceptionally high CO2 permeance of 4650 gas-permeation units (GPU) with an ideal separation factor of 1500 was achieved for CO2/N2, which lies far above the upper bound of the selectivity–permeability trade-off curve, without any significant performance degradation over 6 months.

Graphical abstract: Lewis acidic water as a new carrier for facilitating CO2 transport

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Article information

12 Nov 2018
13 Feb 2019
First published
15 Feb 2019

J. Mater. Chem. A, 2019,7, 5190-5194
Article type

Lewis acidic water as a new carrier for facilitating CO2 transport

S. C. Park, I. S. Chae, G. H. Moon, B. S. Kim, J. Jang, M. Wessling and Y. S. Kang, J. Mater. Chem. A, 2019, 7, 5190
DOI: 10.1039/C8TA10871D

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