globalchange  > 影响、适应和脆弱性
DOI: 10.1016/j.jcou.2017.03.001
Scopus ID: 2-s2.0-85014509737
CO2 absorption behavior of azole-based protic ionic liquids: Influence of the alkalinity and physicochemical properties
Author: Xu Y.
Source Publication: Journal of CO2 Utilization
ISSN: 22129820
Publishing Year: 2017
Volume: 19
pages begin: 1
pages end: 8
Language: 英语
Keyword: Alkalinity ; CO2 capture ; Ionic liquids ; Physicochemical property
Scopus Keyword: Activation energy ; Alkalinity ; Chemical activation ; Ionic liquids ; Liquids ; Nuclear magnetic resonance spectroscopy ; pH ; Refractive index ; Solubility ; Thermal expansion ; Titration ; Voltammetry ; Absorption behaviors ; Absorption capacity ; Absorption mechanisms ; Physicochemical property ; Potentiometric titrations ; Protic ionic liquids ; Solubility parameters ; Thermal expansion coefficients ; Carbon dioxide
English Abstract: Recently, chemical fixation of CO2 catalyzed by protic ionic liquids (PILs) has been successfully achieved, suggesting that CO2 absorption behavior plays an important role on CO2 activation and transformation. For this reason, the influence of the alkalinity and physicochemical properties on CO2 absorption behavior of four azole-based PILs, namely [DBNH][Pyr], [DBNH][Im], [DBUH][Pyr], and [DBUH][Im] was discussed in this work. The alkalinity of PILs was determined by potentiometric titration, and free space of PILs was evaluated by thermal expansion coefficient and refractive index. Solubility parameter of PILs was obtained from the activation energy for viscous flow. The results show that PILs with [Pyr]- exhibits stronger alkalinity and larger free space, which can help to improve CO2 capture capacity. Whereas PILs with larger cation size [DBUH]+ exerts higher viscosity, resulting in slower absorption rate of CO2. Furthermore, the CO2 absorption capacity is inversely proportional to the solubility parameter of PILs. The absorption mechanism proved by FT-IR and 13C NMR spectra indicates that [Pyr]- or [Im]- can react with CO2 to form carbamate. Accordingly, considering the CO2 capture capacity and absorption rate, [DBNH][Pyr] may be a good candidate for efficient CO2 capture and activation with low enthalpy of absorption of -38.2 kJ mol-1. © 2017 Published by Elsevier B.V.
Funding Project: National Natural Science Foundation of China
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Document Type: 期刊论文
Appears in Collections:影响、适应和脆弱性

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Xu Y.. CO2 absorption behavior of azole-based protic ionic liquids: Influence of the alkalinity and physicochemical properties[J]. Journal of CO2 Utilization,2017-01-01,19
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