title: Facilitated transport in hydroxide-exchange membranes for post-combustion CO2 separation.
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.
authors.affiliation: Department of Chemical and Biomolecular Engineering, University of Delaware, Newark, Delaware 19716 (USA), Fax: (302) 831-2582, Homepage: yan.cbe.udel.edu.
authors.forename: Laj
authors.initials: L
authors.lastname: Xiong
authors.forename: Shuang
authors.initials: S
authors.lastname: Gu
authors.forename: Kurt O
authors.initials: KO
authors.lastname: Jensen
authors.forename: Yushan S
authors.initials: YS
authors.lastname: Yan
mesh_terms: D002245:Carbon Dioxide / Q000737:chemistry*; D057965:Carbon Sequestration; D006878:Hydroxides / Q000737:chemistry*; D007474:Ion Exchange; D008567:Membranes, Artificial; D009943:Organophosphorus Compounds / Q000737:chemistry*; D011108:Polymers / Q000737:chemistry*; D013450:Sulfones / Q000737:chemistry*
chemical_list: D006878:Hydroxides; D008567:Membranes, Artificial; D009943:Organophosphorus Compounds; D011108:Polymers; D013450:Sulfones; D002245:Carbon Dioxide; C017662:polysulfone P 1700; C031356:hydroxide ion
keywords: carbon; facilitated transport; gas separation; ion exchange; membranes