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Facilitated Transport in Hydroxide-Exchange Membranes for Post-Combustion CO2 Separation

Authors

  • Laj Xiong,

    1. Department of Chemical and Biomolecular Engineering, University of Delaware, Newark, Delaware 19716 (USA), Fax: (302) 831-2582, Homepage: yan.cbe.udel.edu
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  • Prof. Shuang Gu,

    1. Department of Chemical and Biomolecular Engineering, University of Delaware, Newark, Delaware 19716 (USA), Fax: (302) 831-2582, Homepage: yan.cbe.udel.edu
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  • Kurt O. Jensen,

    1. Department of Chemical and Biomolecular Engineering, University of Delaware, Newark, Delaware 19716 (USA), Fax: (302) 831-2582, Homepage: yan.cbe.udel.edu
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  • Prof. Yushan S. Yan

    Corresponding author
    1. Department of Chemical and Biomolecular Engineering, University of Delaware, Newark, Delaware 19716 (USA), Fax: (302) 831-2582, Homepage: yan.cbe.udel.edu
    • Department of Chemical and Biomolecular Engineering, University of Delaware, Newark, Delaware 19716 (USA), Fax: (302) 831-2582, Homepage: yan.cbe.udel.edu

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Abstract

Hydroxide-exchange membranes are developed for facilitated transport CO2 in post-combustion flue-gas feed. First, a correlation between the basicity of fixed-site functional groups and CO2-separation performance is discovered. This relationship is used to identify phosphonium as a promising candidate to achieve high CO2-separation performance. Consequently, quaternary phosphonium-based hydroxide-exchange membranes are demonstrated to have a separation performance that is above the Robeson upper bound. Specifically, a CO2 permeability as high as 1090 Barrer and a CO2/N2 selectivity as high as 275 is achieved. The high performance observed in the membranes can be attributed to the quaternary phosphonium moiety.

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