CO2 Capture in Wet and Dry Superbase Ionic Liquids

S. F. Rebecca Taylor, Corina McCrellis, Claire McStay, Johan Jacquemin, Christopher Hardacre, Maxime Mercy, Robert G. Bell, Nora H. de Leeuw

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The solubility of carbon dioxide in five tetraalkylphosphonium superbase ionic liquids, namely the trihexyltetradecylphoshonium phenoxide, trihexyltetradecylphoshonium benzotriazolide, trihexyltetradecylphoshonium benzimidazolide, trihexyltetradecylphoshonium 1,2,3-triazolide, and trihexyltetradecylphoshonium 1,2,4-triazolide was studied experimentally under dry and wet conditions at 22 A degrees C and at atmospheric pressure, using a gravimetric saturation technique. The effects of anion structure and of the presence or absence of water in the solution on the carbon dioxide solubility were then deduced from the data. H-1 and C-13-NMR spectroscopy and ab initio calculations were also conducted to probe the interactions in these solutions, as carbon dioxide and water can compete in the ionic liquid structure during the absorption process. Additionally, the viscosity of selected superbase ionic liquids was measured under dry and wet conditions, in the presence or absence of CO2, to evaluate their practical application in carbon dioxide capture processes. Finally, the recyclability of the trihexyltetradecylphoshonium 1,2,4-triazolide under dry and wet conditions was determined to probe the ability of selected solvents to solubilize chemically a high concentration of carbon dioxide and then release it in a low energy demand process.
Original languageEnglish
Pages (from-to)511-527
Number of pages17
JournalJournal of Solution Chemistry
Issue number3
Early online date28 Mar 2015
Publication statusPublished - Apr 2015


  • Carbon dioxide
  • Superbase ionic liquids
  • Dry and wet conditions
  • NMR spectroscopy
  • Ab initio calculations


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