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New Insights into CO 2 Absorption Mechanisms with Amino‐Acid Ionic Liquids
Author(s) -
Yang Qiwei,
Wang Zhiping,
Bao Zongbi,
Zhang Zhiguo,
Yang Yiwen,
Ren Qilong,
Xing Huabin,
Dai Sheng
Publication year - 2016
Publication title -
chemsuschem
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.412
H-Index - 157
eISSN - 1864-564X
pISSN - 1864-5631
DOI - 10.1002/cssc.201501691
Subject(s) - amine gas treating , carbamic acid , ionic liquid , chemistry , deprotonation , absorption (acoustics) , ionic bonding , amino acid , molecule , organic chemistry , ion , materials science , catalysis , composite material , biochemistry
The last decade saw an explosion of interest in using amine‐functionalized materials for CO 2 capture and conversion, and it is of great importance to elucidate the relationship between the molecular structure of amine‐functionalized materials and their CO 2 capacity. In this work, based on a new quantitative analysis method for the CO 2 absorption mechanism of amino‐acid ionic liquids (ILs) and quantum chemical calculations, we show that the small difference in the local structure of amine groups in ILs could lead to much different CO 2 absorption mechanisms, which provides an opportunity for achieving higher CO 2 capacity by structure design. This work revealed that the actual CO 2 absorption mechanism by amino‐acid ILs goes beyond the apparent CO 2 /amine stoichiometry; a rigid ring structure around the amine group in ILs creates a unique electrostatic environment that inhibits the deprotonation of carbamic acid and enables actually equimolar CO 2 /amine absorption.