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Experimental investigation of CO2 absorption enthalpy in conventional imidazolium ionic liquids

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  • Yi Hu
  • Xiaoshan Li
  • Ji Liu
  • Liwei Li
  • Liqi Zhang

Abstract

Ionic liquids (ILs) have elicited considerable attention in the field of gas absorption and separation due to their unique properties. In addition to absorption capacity and absorption rate, absorption enthalpy is an important indicator for sorbent evaluation. In this work, the absorption enthalpy of CO2 in several kinds of ILs was measured directly using a Calvet calorimeter. The effects of anions, cationic alkyl chain length, and temperature on absorption properties were discussed. Results showed that anions influenced CO2 absorption enthalpy considerably. 1‐Butyl‐3‐methylimidazolium acetate presented the most appropriate enthalpy for CO2 absorption compared with the other ILs investigated with different chain lengths. Absorption enthalpy was dependent on temperature, and the isosteric absorption enthalpy decreased with an increase in temperature. This work provides a useful basis for the appropriate selection of alternative forms of IL sorbents for post‐combustion CO2 capture technology. © 2018 Society of Chemical Industry and John Wiley & Sons, Ltd.

Suggested Citation

  • Yi Hu & Xiaoshan Li & Ji Liu & Liwei Li & Liqi Zhang, 2018. "Experimental investigation of CO2 absorption enthalpy in conventional imidazolium ionic liquids," Greenhouse Gases: Science and Technology, Blackwell Publishing, vol. 8(4), pages 713-720, August.
    • Handle: RePEc:wly:greenh:v:8:y:2018:i:4:p:713-720
    DOI: 10.1002/ghg.1777
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    References listed on IDEAS

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    1. Mei Wang & Na Rao & Mingming Wang & Qunpeng Cheng & Shunxi Zhang & Jianfen Li, 2018. "Properties of ionic liquid mixtures of [NH2e‐mim][BF4] and [bmim][BF4] as absorbents for CO2 capture," Greenhouse Gases: Science and Technology, Blackwell Publishing, vol. 8(3), pages 483-492, June.
    2. Clair Gough & Paul Upham, 2011. "Biomass energy with carbon capture and storage (BECCS or Bio‐CCS)," Greenhouse Gases: Science and Technology, Blackwell Publishing, vol. 1(4), pages 324-334, December.
    3. Xie, Yujiao & Zhang, Yingying & Lu, Xiaohua & Ji, Xiaoyan, 2014. "Energy consumption analysis for CO2 separation using imidazolium-based ionic liquids," Applied Energy, Elsevier, vol. 136(C), pages 325-335.
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