Solvation dynamics of CO2(g) by monoethanolamine at the gas-liquid interface: A molecular mechanics approach

I. Shou Huang, Jia Jen Li, Ming Kang Tsai

Research output: Contribution to journalArticle

2 Citations (Scopus)

Abstract

Aclassical force field approachwas used to characterize the solvation dynamics of high-density CO2(g) by monoethanolamine (MEA) at the air-liquid interface. Intra- and intermolecular CO2 and MEA potentials were parameterized according to the energetics calculated at the MP2 and BLYP-D2 levels of theory. The thermodynamic properties of CO2 and MEA, such as heat capacity and melting point, were consistently predicted using this classical potential. An approximate interfacial simulation for CO2(g)/MEA(l) was performed to monitor the depletion of the CO2(g) phase, which was influenced by amino and hydroxyl groups of MEA. There are more intramolecular hydrogen bond interactions notably identified in the interfacial simulation than the case of bulk MEA(l) simulation. The hydroxyl group of MEA was found to more actively approach CO2 and overpower the amino group to interact with CO2 at the air-liquid interface. With artificially reducing the dipole moment of the hydroxyl group, CO2-amino group interaction was enhanced and suppressed CO2(g) depletion. The hydroxyl group of MEA was concluded to play dual but contradictory roles for CO2 capture.

Original languageEnglish
Article number8
JournalMolecules
Volume22
Issue number1
DOIs
Publication statusPublished - 2017 Jan

Keywords

  • Alcoholamine
  • CO capture
  • Dynamics
  • Interface
  • Molecular mechanics

ASJC Scopus subject areas

  • Analytical Chemistry
  • Chemistry (miscellaneous)
  • Molecular Medicine
  • Pharmaceutical Science
  • Drug Discovery
  • Physical and Theoretical Chemistry
  • Organic Chemistry

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