Projects per year
Abstract
The physical absorption of CO2 by protic and aprotic ionic liquids such as 1-ethyl-3-methyl-imidazolium tetrafluoroborate was examined at the molecular level using symmetry adapted perturbation theory (SAPT) and density functional techniques through comparison of interaction energies of noncovalently bound complexes between the CO2 molecule and a series of ionic liquid ions and ion pairs. These energies were contrasted with those for complexes with model amines such as methylamine, dimethylamine, and trimethylamine. Detailed analysis of the five fundamental forces that are responsible for stabilization of the complexes is discussed. It was confirmed that the nature of the anion had a greater effect upon the physical interaction energy in non functionalized ionic liquids, with dispersion forces playing an important role in CO2 solubility. Hydrogen bonding with protic cations was shown to impart additional stability to the noncovalently bound CO2···IL complex through inductive forces. Two solvation models, the conductor-like polarizable continuum model (CPCM) and the universal solvation model (SMD), were used to estimate the impact of solvent effects on the CO2 binding. Both solvent models reduced interaction energies for all types of ions. These interaction energies appeared to favor imidazolium cations and carboxylic and sulfonic groups as well as bulky groups (e.g., NTf2) in anions for the physical absorption of CO2. The structure–reactivity relationships determined in this study may help in the optimization of the physical absorption process by means of ionic liquids
Original language | English |
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Pages (from-to) | 11748-11759 |
Number of pages | 12 |
Journal | Journal of Physical Chemistry B |
Volume | 119 |
Issue number | 35 |
DOIs | |
Publication status | Published - 2015 |
Projects
- 3 Finished
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Protonic Materials for Green Chemical Futures
Macfarlane, D. (Primary Chief Investigator (PCI))
Australian Research Council (ARC)
1/04/13 → 1/12/20
Project: Research
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Towards ab initio molecular dynamics simulations of proton and electron transfer processes
Pas, E. (Primary Chief Investigator (PCI))
Australian Research Council (ARC)
1/04/12 → 13/12/16
Project: Research
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Fully ab initio, large-scale calculations of thermodynamic and transport properties of ionic materials
Pas, E. (Primary Chief Investigator (PCI)), Macfarlane, D. (Chief Investigator (CI)) & Gordon, M. S. (Partner Investigator (PI))
Australian Research Council (ARC)
4/01/10 → 31/08/14
Project: Research