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Tuning the Basicity of Ionic Liquids for Equimolar CO2 Capture

Authors

  • Dr. Congmin Wang,

    Corresponding author
    1. Department of Chemistry, Zhejiang University, Hangzhou 310027 (P. R. China), Fax: (+86) 571-8795-1895
    2. Chemical Sciences Division, Oak Ridge National Laboratory, Oak Ridge, TN 37831 (USA), Fax: (+1) 865-576-5235
    • Department of Chemistry, Zhejiang University, Hangzhou 310027 (P. R. China), Fax: (+86) 571-8795-1895
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  • Xiaoyan Luo,

    1. Department of Chemistry, Zhejiang University, Hangzhou 310027 (P. R. China), Fax: (+86) 571-8795-1895
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  • Dr. Huimin Luo,

    1. Nuclear Science and Technology Division, Oak Ridge National Laboratory, Oak Ridge, TN 37831 (USA)
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  • Dr. De-en Jiang,

    1. Chemical Sciences Division, Oak Ridge National Laboratory, Oak Ridge, TN 37831 (USA), Fax: (+1) 865-576-5235
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  • Prof. Haoran Li,

    1. Department of Chemistry, Zhejiang University, Hangzhou 310027 (P. R. China), Fax: (+86) 571-8795-1895
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  • Dr. Sheng Dai

    Corresponding author
    1. Chemical Sciences Division, Oak Ridge National Laboratory, Oak Ridge, TN 37831 (USA), Fax: (+1) 865-576-5235
    2. Department of Chemistry, University of Tennessee, Knoxville, TN 37966 (USA)
    • Chemical Sciences Division, Oak Ridge National Laboratory, Oak Ridge, TN 37831 (USA), Fax: (+1) 865-576-5235
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  • This work was supported by the Division of Chemical Sciences, Geosciences, and Biosciences, Office of Basic Energy Sciences, U.S. Department of Energy. The authors also gratefully acknowledge the support of the National Natural Science Foundation of China (No. 20976151, No. 20704035, No. 20773109, and No. 20990221).

Abstract

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What a catch! Basic ionic liquids (ILs) based on a phosphonium hydroxide derivative can be tuned for CO2 capture by varying the weak proton donors, which have different pKa values. The stability, absorption capacity, and absorption enthalpy of the ILs could be easily tuned: the best IL for CO2 capture has good stability (>300 °C), energy saving (ca. 56 kJ mol−1), and equimolar absorption capability.

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