DOI: 10.1016/j.jcou.2017.03.001
Scopus记录号: 2-s2.0-85014509737
论文题名: CO2 absorption behavior of azole-based protic ionic liquids: Influence of the alkalinity and physicochemical properties
作者: Xu Y.
刊名: Journal of CO2 Utilization
ISSN: 22129820
出版年: 2017
卷: 19 起始页码: 1
结束页码: 8
语种: 英语
英文关键词: Alkalinity
; CO2 capture
; Ionic liquids
; Physicochemical property
Scopus关键词: 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
英文摘要: 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.
资助项目: National Natural Science Foundation of China
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/52735
Appears in Collections: 影响、适应和脆弱性
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Recommended Citation:
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