Physicochemical Properties of 1-Methoxyethyl-3-Methylimidazolium Glycine

魏杰,; 董贺新,; 陈霞,; 杨宇轩,; 房大维,; 关伟,; 杨家振,

doi:10.3866/pku.whxb201801112

Cited by 7 publications

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“…For an efficient carbon capture, a large number of studies have focused on how to design functionalized ILs. , In 2002, Davis et al reported for the first time that amino-containing ILs performed well in the CO 2 absorption. After that, a number of amino-functionalized ILs were prepared and used for CO 2 capture and transformation. − As natural amino resources, amino acids are abundant in nature and possess many excellent properties, and have been used as anion or cation in the preparation of new ILs. − It is found that these amino acid ILs, as one class of the amino-functionalized ILs, have high CO 2 absorption capacity and great potential in practical CO 2 absorption. − For example, the CO 2 absorption capacity by the ILs with iminodiacetic acid (IDA) anions could be as high as 1.69 mol CO 2 mol –1 IL …”

Section: Introductionmentioning

confidence: 99%

How Does the Moisture Affect CO₂ Absorption by a Glycinate Ionic Liquid?

Min¹,

Li²,

Wang³

et al. 2021

ACS Sustainable Chem. Eng.

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Ionic liquids (ILs) have shown great potential in CO 2 capture from the exhaust of fossil fuels burning due to their unique structures and properties. Since the flue gas often contains a small amount of water, understanding the effect of water is critical for the direct capture of postcombustion CO 2 by ionic liquids. In recent years, the effect of water in CO 2 capture by ILs has been studied in some details, but little is known of the new species produced after humid CO 2 capture and thus for the system composition as well as the contribution of each absorption site of ILs to the capture capacity of CO 2 . In this work, a simple amino acid ionic liquid, 1-ethyl-3methylimidazolium glycinate ([C 2 mim][Gly]), has been prepared and used to absorb humid CO 2 at 25 °C, and a quantitative approach is established to estimate the absorption capacity of CO 2 by different absorption sites. It is found that the absorption capacity of CO 2 is as high as 0.91 mol CO 2 per mol IL in the wet environment, which is nearly double that of dry CO 2 by neat IL. Quantitative investigations by multiple spectral techniques and quantum chemical calculations indicate that the inhalation of H 2 O results in the production of [HCO 3 ] − in the system and activation of the C2 site of the imidazolium cation. It is this activated site that reacts with CO 2 to form imidazolium-2-carboxylate (NHC-CO 2 ) and significantly improves the absorption capacity of CO 2 . This is remarkably different from the absorption of dry CO 2 , in which anions of the IL are predominant for the absorption of CO 2 .

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