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Cooperative chemical adsorption of acid gases in functionalized metal-organic frameworks

  • US 10,722,863 B2
  • Filed: 10/18/2016
  • Issued: 07/28/2020
  • Est. Priority Date: 10/18/2011
  • Status: Active Grant
First Claim
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1. A cooperative chemical adsorption method for acid gas separations, the method comprising:

  • (a) providing a porous metal-organic framework, wherein the metal-organic framework comprises metal-ligand bonds;

    (b) functionalizing pore surfaces with a plurality of ligands selected from the group of primary and secondary imines, said ligands producing two adjacent imines that define adjacent adsorption sites; and

    (c) adsorbing acid gas molecules with said adjacent amine adsorption sites;

    (d) wherein a plurality of imines adsorb acid gas at the same time and form covalently linked aggregates of more than one ammonium carbamate ion pair;

    (e) wherein the aggregates spatially extend along the pore surface in at least one dimension; and

    (f) wherein a gaseous stream depleted in acid gas and a solid-phase composition enriched in acid gas is produced.

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