Phosphonium-based anion exchange polymers for moisture swing direct air capture of carbon dioxide
AssigneeArizona Board of Regents on behalf of Arizona State University
InventorsMatthew GREEN, Marlene VELAZCO MEDEL, Kacie NIIMOTO
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Abstract
A phosphonium-based polymeric ionic liquid for moisture-swing direct air capture of carbon dioxide is disclosed. The polymeric ionic liquid comprises a styrene-based backbone and phosphonium groups covalently bonded to the backbone, each substituted with methyl, and bicarbonate counterions associated with the phosphonium groups. The polymeric ionic liquid adsorbs carbon dioxide under cyclic wet-dry conditions and exhibits a capture capacity of at least 500 μmol per gram. Methods of producing the polymeric ionic liquid and methods of capturing carbon dioxide using alternating humidity cycles are also disclosed.
Claims20
A phosphonium-based polymeric ionic liquid (PIL) for moisture-swing direct air capture of carbon dioxide, comprising:
- a styrene-based polymer backbone;
- and
- phosphonium groups covalently bonded to the backbone, each substituted with methyl.
A method of producing a polymeric ionic liquid for moisture-swing direct air capture of carbon dioxide, the method comprising by:
- polymerizing vinylbenzyl monomers to form a styrene-based backbone;
- functionalizing the backbone with phosphonium groups each substituted with methyl;
- introducing chloride counterions during functionalization;
- and
- exchanging the chloride counterions with bicarbonate ions;
- wherein the polymeric ionic liquid comprises phosphonium groups with methyl substituents and bicarbonate counterions.
A method of capturing carbon dioxide from ambient air, comprising:
- providing a polymeric ionic liquid comprising:
- a styrene-based backbone;
- phosphonium functional groups covalently bonded to the backbone, each substituted with one or more alkyl groups;
- and
- bicarbonate counterions associated with the phosphonium functional groups;
- exposing the polymeric ionic liquid to ambient air under a first condition of reduced humidity to adsorb carbon dioxide;
- and
- subsequently exposing the polymeric ionic liquid to a second condition of increased humidity to desorb the carbon dioxide.
Dependencies are inferred from the claim text.