Lewis acidic water as a new carrier for facilitating CO2 transport
- Authors
- Park, Seul Chan; Chae, Il Seok; Moon, Gi Hyeon; Kim, Byung Su; Jang, Jaeyoung; Wessling, Matthias; Kang, Yong Soo
- Issue Date
- Mar-2019
- Publisher
- ROYAL SOC CHEMISTRY
- Citation
- JOURNAL OF MATERIALS CHEMISTRY A, v.7, no.10, pp.5190 - 5194
- Indexed
- SCIE
SCOPUS
- Journal Title
- JOURNAL OF MATERIALS CHEMISTRY A
- Volume
- 7
- Number
- 10
- Start Page
- 5190
- End Page
- 5194
- URI
- https://scholarworks.bwise.kr/hanyang/handle/2021.sw.hanyang/2936
- DOI
- 10.1039/c8ta10871d
- ISSN
- 2050-7488
- Abstract
- 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.
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