1. Understanding the Competitive Gas Absorption of CO2 and SO2 in Superbase Ionic Liquids
- Author
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Ciaran McReynolds, Christopher Hardacre, S. F. Rebecca Taylor, Matthew McClung, Helen Daly, Adam J. Greer, Johan Jacquemin, University of Manchester [Manchester], School of Chemistry and Chemical Engineering, Queen’s University Belfast, David Keir Building, Stranmillis Road, Belfast BT9 5AG, Northern Ireland, Physico-chimie des Matériaux et des Electrolytes pour l'Energie (PCM2E), Université de Tours, and Université de Tours (UT)
- Subjects
Superbase Ionic Liquids ,General Chemical Engineering ,Analytical chemistry ,Ionic Liquids ,SO2 ,02 engineering and technology ,010402 general chemistry ,Mass spectrometry ,01 natural sciences ,Industrial and Manufacturing Engineering ,Viscosity ,chemistry.chemical_compound ,Desorption ,Superbase ,[CHIM]Chemical Sciences ,Solubility ,Chemistry ,General Chemistry ,021001 nanoscience & nanotechnology ,CO2 capture ,Competitive Absorption ,0104 chemical sciences ,[CHIM.THEO]Chemical Sciences/Theoretical and/or physical chemistry ,Ionic liquid ,Gravimetric analysis ,CO2 ,Absorption (chemistry) ,0210 nano-technology ,competitive gas absorption - Abstract
International audience; During this work, an original study of the CO2 and SO2 competitive gas absorption in three superbase ionic liquids (ILs), namely, trihexyltetradecylphosphonium 1,2,4-triazolide ([P66614][124Triz]), and trihexyltetradecylphoshonium benzimidazolide ([P66614][Benzim]), is reported for the first time. To initiate such a comprehensive study, the CO2 and SO2 mixed gas solubility in selected ILs was determined by using an original and accurate dynamic method coupled with mass spectrometry after several absorption and desorption cycles. This method has been validated by comparing the gravimetric uptake of CO2 with the mass spectrometry data using trihexyltetradecylphosphonium benzotriazolide, 1,2,4-triazolide, and benzimidazolide ILs and shown to be consistent within 10% in mole ratio units. Solubility results clearly show that the presence of SO2 in the gas stream decreases the CO2 capture capability of the investigated ILs. Furthermore, the viscosity, chemical analysis (water content and sulfur content), and spectroscopic data (1H NMR, 13C NMR, attenuated total reflectance-infrared, and X-ray photoelectron spectroscopy) changes before and after absorption–desorption of the gases were determined and depicted to truly understand the reaction mechanism that occurs in the liquid phase, highlighting a clear competition between the SO2 versus CO2 chemical reaction and selected superbase ILs.
- Published
- 2018
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