Imidazolium-Based Poly(ionic liquid)s as New Alternatives for CO2 Capture

Authors

  • Elena I. Privalova,

    1. Process Chemistry Centre, Laboratory of Industrial Chemistry and Reaction Engineering, Åbo Akademi University, 20500 Turku/Åbo (Finland)
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  • Erno Karjalainen,

    1. Laboratory of Polymer Chemistry, University of Helsinki, 00014 Helsinki (Finland)
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  • Dr. Mari Nurmi,

    1. Laboratory of Paper Coating and Converting, Åbo Akademi University, 20500 Turku/Åbo (Finland)
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  • Dr. Päivi Mäki-Arvela,

    1. Process Chemistry Centre, Laboratory of Industrial Chemistry and Reaction Engineering, Åbo Akademi University, 20500 Turku/Åbo (Finland)
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  • Dr. Kari Eränen,

    1. Process Chemistry Centre, Laboratory of Industrial Chemistry and Reaction Engineering, Åbo Akademi University, 20500 Turku/Åbo (Finland)
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  • Prof. Heikki Tenhu,

    1. Laboratory of Polymer Chemistry, University of Helsinki, 00014 Helsinki (Finland)
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  • Prof. Dmitry Yu. Murzin,

    1. Process Chemistry Centre, Laboratory of Industrial Chemistry and Reaction Engineering, Åbo Akademi University, 20500 Turku/Åbo (Finland)
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  • Prof. Jyri-Pekka Mikkola

    Corresponding author
    1. Process Chemistry Centre, Laboratory of Industrial Chemistry and Reaction Engineering, Åbo Akademi University, 20500 Turku/Åbo (Finland)
    2. Technical Chemistry, Chemical-Biological Center, Department of Chemistry, Faculty of Science and Technology, Umeå University, 90187 Umeå (Sweden)
    • Process Chemistry Centre, Laboratory of Industrial Chemistry and Reaction Engineering, Åbo Akademi University, 20500 Turku/Åbo (Finland)

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Abstract

Solid imidazolium-based poly(ionic liquid)s with variable molecular weights that contain the poly[2-(1-butylimidazolium-3-yl)ethyl methacrylate] (BIEMA) cation and different counter anions were evaluated in terms of CO2 capture and compared with classical ionic liquids with similar counter anions. In addition to poly(ionic liquid)s with often-applied ions such as BF4, PF6, NTf2, trifluoromethanesulfonate (OTf) and Br, for the first time [BIEMA][acetate] was synthesised, which revealed a remarkably high CO2 sorption performance that exceeded the poly(ionic liquid)s studied previously on average by a factor of four (12.46 mg gPIL−1). This study provides an understanding of the factors that affect CO2 sorption and a comparison of the CO2 capture efficiency with the frequently used sorbents. Moreover, all the studied sorbents were reusable if regenerated under carefully selected conditions and can be considered as suitable candidates for CO2 sorption.

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