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Citation
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HERO ID
7421432
Reference Type
Journal Article
Title
On the origin of preferred bicarbonate production from carbon dioxide (CO₂) capture in aqueous 2-amino-2-methyl-1-propanol (AMP)
Author(s)
Stowe, HM; Vilčiauskas, L; Paek, E; Hwang, GS; ,
Year
2015
Is Peer Reviewed?
1
Journal
Physical Chemistry Chemical Physics
ISSN:
1463-9076
EISSN:
1463-9084
Publisher
Royal Society of Chemistry
Volume
17
Issue
43
Page Numbers
29184-29192
Language
English
PMID
26466331
DOI
10.1039/c5cp04876a
Web of Science Id
WOS:000364024100081
URL
http://xlink.rsc.org/?DOI=C5CP04876A
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Abstract
AMP and its blends are an attractive solvent for CO2 capture, but the underlying reaction mechanisms still remain uncertain. We attempt to elucidate the factors enhancing bicarbonate production in aqueous AMP as compared to MEA which, like most other primary amines, preferentially forms carbamate. According to our predicted reaction energies, AMP and MEA exhibit similar thermodynamic favorability for bicarbonate versus carbamate formation; moreover, the conversion of carbamate to bicarbonate also does not appear more favorable kinetically in aqueous AMP compared to MEA. Ab initio molecular dynamics simulations, however, demonstrate that bicarbonate formation tends to be kinetically more probable in aqueous AMP while carbamate is more likely to form in aqueous MEA. Analysis of the solvation structure and dynamics shows that the enhanced interaction between N and H2O may hinder CO2 accessibility while facilitating the AMP + H2O → AMPH(+) + OH(-) reaction, relative to the MEA case. This study highlights the importance of not only thermodynamic but also kinetic factors in describing CO2 capture by aqueous amines.
Keywords
2-amino-2-methyl-1-propanol; bicarbonate; carbon dioxide; ethanolamine; propanolamine derivative; water; chemistry; molecular dynamics; quantum theory; thermodynamics; Bicarbonates; Carbon Dioxide; Ethanolamine; Molecular Dynamics Simulation; Propanolamines; Quantum Theory; Thermodynamics; Water
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