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Published on: April 10, 2018
Facilitated transport in hydroxide-exchange membranes for post-combustion CO2 separation
Laj Xiong1, Shuang Gu, Kurt O Jensen
1Department of Chemical and Biomolecular Engineering, University of Delaware, Newark, Delaware 19716 (USA), Fax: (302) 831-2582, Homepage: yan.cbe.udel.edu.
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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