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Highly Selective Capture of CO2 by Ether-Functionalized Pyridinium Ionic Liquids with Low Viscosity
Zeng, Shaojuan1,2; Wang, Jian1,2; Bai, Lu1; Wang, Binqi3; Gao, Hongshuai1; Shang, Dawei1,2; Zhang, Xiangping1; Zhang, Suojiang1
2015-09-01
Source PublicationENERGY & FUELS
ISSN0887-0624
Volume29Issue:9Pages:6039-6048
Abstract

In this work, three kinds of ether-functionalized pyridinium-based ILs [EnPy][NTf2] with low viscosity were designed and synthesized and used for highly selective separation of CO2 from CH4. It was found that the ether groups play an important role on physicochemical properties and CO2/CH4 selectivity in these three ILs. Compared with the nonfunctionalized analogues [CmPy][NTf2], the viscosities of [E(n)PA [NTf2] are lower and obviously decrease with the increasing number of ether oxygen atoms. The presence of ether groups on the cation has weak impacts on CO2 solubility of the ILs, but it contributes to a much lower CH4 solubility, which leads to the great increase of CO2/CH4 selectivity using [E(n)PA][NTf2]. Moreover, CO2/CH4 selectivity in all investigated ILs greatly decreases with the increasing temperature due to the weaker temperature dependence of CH4 solubility. In addition, the thermodynamic properties including the Gibbs free energy, enthalpy, and entropy of CO2 and CH4 in these ILs were also obtained, and the CO2 and CH4 dissolution mechanisms were further analyzed. The results demonstrated that the gas-IL interaction plays a dominate role in CH4 solubility in the investigated ILs, but CO2 dissolution in ILs is determined by both the IL-gas interaction and free volume of ILs. This work will offer new insights into designing more competitive ILs for selective separation of CO2 from CH4.

SubtypeArticle
WOS HeadingsScience & Technology ; Technology
DOI10.1021/acs.energyfuels.5b01274
Indexed BySCI
Language英语
WOS KeywordLOW-PRESSURE SOLUBILITIES ; CARBON-DIOXIDE ; THERMOPHYSICAL PROPERTIES ; BINARY-MIXTURES ; PHASE-BEHAVIOR ; ABSORPTION ; GAS ; IMIDAZOLIUM ; SEPARATION ; EFFICIENT
WOS Research AreaEnergy & Fuels ; Engineering
WOS SubjectEnergy & Fuels ; Engineering, Chemical
Funding OrganizationBeijing Municipal Natural Science Foundation(2141003 ; National Natural Science Fund for Distinguished Young Scholars(21425625) ; National Natural Science Foundation of China(21436010) ; Science and Technology Innovation Team of Cross and Cooperation of Chinese Academy of Sciences ; 2142029)
WOS IDWOS:000363068200054
Citation statistics
Cited Times:39[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.ipe.ac.cn/handle/122111/19750
Collection多相复杂系统国家重点实验室
Affiliation1.Chinese Acad Sci, Beijing Key Lab Ion Liquids Clean Proc, Key Lab Green Proc & Engn, State Key Lab Multiphase Complex Syst,Inst Proc E, Beijing 100190, Peoples R China
2.Univ Chinese Acad Sci, Coll Chem & Engn, Beijing 100049, Peoples R China
3.Beijing Univ Chem Technol, State Key Lab Chem Resource Engn, Beijing 102200, Peoples R China
Recommended Citation
GB/T 7714
Zeng, Shaojuan,Wang, Jian,Bai, Lu,et al. Highly Selective Capture of CO2 by Ether-Functionalized Pyridinium Ionic Liquids with Low Viscosity[J]. ENERGY & FUELS,2015,29(9):6039-6048.
APA Zeng, Shaojuan.,Wang, Jian.,Bai, Lu.,Wang, Binqi.,Gao, Hongshuai.,...&Zhang, Suojiang.(2015).Highly Selective Capture of CO2 by Ether-Functionalized Pyridinium Ionic Liquids with Low Viscosity.ENERGY & FUELS,29(9),6039-6048.
MLA Zeng, Shaojuan,et al."Highly Selective Capture of CO2 by Ether-Functionalized Pyridinium Ionic Liquids with Low Viscosity".ENERGY & FUELS 29.9(2015):6039-6048.
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