Absorption of carbon dioxide by ionic liquids with carboxylate anions

Stevanovič, S.; Podgoršek, Ajda; Moura, Leila; Santini, Catherine C.; Pádua, Agı́lio A. H.; Gomes, Margarida F. Costa

doi:10.1016/j.ijggc.2013.04.017

Cited by 58 publications

(50 citation statements)

References 33 publications

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“…19 In this regards, surprisingly few studies have been performed in which levulinic acid (LA) is used as the anion constituent of ILs ([BMIM][Lev], ammonium Lev, and cholinium Lev). [20][21][22][23] LA can be prepared from cellulose through an acid-catalyzed one-pot reaction (Figure 1) 24 and has been recognized by the US Department of Energy as one of the top 10 carbohydrate-derived target chemicals. 25 Acid catalysts able to further optimize the conversion of cellulose into LA are continuously developed.…”

Section: Introductionmentioning

confidence: 99%

Insights into the levulinate-based ionic liquid class: synthesis, cellulose dissolution evaluation and ecotoxicity assessment

et al. 2019

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Section: Introductionmentioning

confidence: 99%

Insights into the levulinate-based ionic liquid class: synthesis, cellulose dissolution evaluation and ecotoxicity assessment

et al. 2019

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“…The addition of small amounts of water has shown to improve the CO2 capture capabilities of some ILs. Phenolate-based ILs, for example, capture CO2 through chemisorption, and the addition of 2 wt% H2O almost doubled the molar CO2 absorption 10 . For acetate-based ILs, which capture CO2 through physisorption, the molar absorption increased eightfold with the addition of 0.35 molar fraction of H2O 11 .…”

Section: Introductionmentioning

confidence: 99%

Reversible Reaction of CO₂ with Superbasic Ionic Liquid [P₆₆₆₁₄][benzim] Studied with in Situ Photoelectron Spectroscopy

Henderson

Thomas²,

Wagstaffe³

et al. 2019

J. Phys. Chem. C

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Ionic liquids (ILs) are of significant interest as CO2 capture agents, and one subgroup of ILs that has shown particular promise is that of superbasic ILs. They can absorb large quantities of CO2 in the dry state, but some will have a diminished CO2 capacity when pre-wetted. In the work presented here, the superbasic IL trihexyl-tetradecylphosphonium benzimidazolide, or [P66614][benzim], was exposed to 3 mbar CO2, 2 mbar H2O vapor, and a CO2 + H2O gas mixture; and investigated using near-ambient pressure X-ray photoelectron spectroscopy. The results show that the IL reacts with CO2 to form carbamate, and that the reaction is reversible through reduction of the surrounding gas pressure. Regardless of whether the IL was exposed to CO2 or H2O vapor first, the presence of H2O under these experimental conditions does not significantly hinder the IL's ability to absorb and react with CO2. Furthermore, the IL appears to preferentially react with CO2 over H2O vapor.

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“…However, these effects were only observed at high water concentrations, whereas further studies showed that the addition of small amounts of water to these ILs could result in an increase in CO2 uptake [26]. Wang et al also reported an increase in CO2 absorption when water was added to phenolate-based ILs and they attributed this increase to bicarbonate formation [20].…”

Section: Introductionmentioning

confidence: 99%

CO2 Capture in Wet and Dry Superbase Ionic Liquids

et al. 2015

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The solubility of carbon dioxide (CO2) in five tetraalkylphosphonium superbase ionic liquids, namely the trihexyltetradecylphoshonium phenoxide, trihexyltetradecylphoshonium benzotriazolide, trihexyltetradecylphoshonium benzimidazolide, trihexyltetradecylphoshonium 1,2,3-triazolide and trihexyltetradecylphoshonium 1,2,4triazolide was studied experimentally under dry and wet conditions at 22 °C and at atmospheric pressure using a gravimetric saturation technique. The effects of anion structure and of the presence or absence of water in solution on the carbon dioxide solubility were then deduced from the data. 1 H and 13 C-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 within a low energy demand process.

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Absorption of carbon dioxide by ionic liquids with carboxylate anions

Cited by 58 publications

References 33 publications

Insights into the levulinate-based ionic liquid class: synthesis, cellulose dissolution evaluation and ecotoxicity assessment

Insights into the levulinate-based ionic liquid class: synthesis, cellulose dissolution evaluation and ecotoxicity assessment

Reversible Reaction of CO₂ with Superbasic Ionic Liquid [P₆₆₆₁₄][benzim] Studied with in Situ Photoelectron Spectroscopy

CO2 Capture in Wet and Dry Superbase Ionic Liquids

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Absorption of carbon dioxide by ionic liquids with carboxylate anions

Cited by 58 publications

References 33 publications

Insights into the levulinate-based ionic liquid class: synthesis, cellulose dissolution evaluation and ecotoxicity assessment

Insights into the levulinate-based ionic liquid class: synthesis, cellulose dissolution evaluation and ecotoxicity assessment

Reversible Reaction of CO2 with Superbasic Ionic Liquid [P66614][benzim] Studied with in Situ Photoelectron Spectroscopy

CO2 Capture in Wet and Dry Superbase Ionic Liquids

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Reversible Reaction of CO₂ with Superbasic Ionic Liquid [P₆₆₆₁₄][benzim] Studied with in Situ Photoelectron Spectroscopy