Alkylamine functionalized metal-organic frameworks for composite gas separations
First Claim
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1. A porous organic framework (MOF) adsorbent for gas separations, comprising:
- (a) a porous metal-organic framework of M2(dobpdc) where M is selected from the group of metals consisting of Mg, Ca, Mn, Cr, Fe, Co, Ni, Cu and Zn, the framework having coordinatively unsaturated metal centers; and
(b) a plurality of ligands disposed within pores of the metal-organic framework to produce a functionalized framework, said ligands having a ligand bridge with at least one first functional group capable of adsorbing a gas and at least one second functional group coupled to at least one metal center of said metal-organic framework;
(c) wherein contact of the functionalized framework with a volume of gases produces a stepped adsorption isotherm; and
(d) wherein gas adsorption properties before and after each step cannot be modeled as a continuous Langmuir function.
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Abstract
Functionalized metal-organic framework adsorbents with ligands containing basic nitrogen groups such as alkylamines and alkyldiamines appended to the metal centers and method of isolating carbon dioxide from a stream of combined gases and carbon dioxide partial pressures below approximately 1 and 1000 mbar. The adsorption material has an isosteric heat of carbon dioxide adsorption of greater than −60 kJ/mol at zero coverage using a dual-site Langmuir model.
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18 Claims
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1. A porous organic framework (MOF) adsorbent for gas separations, comprising:
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(a) a porous metal-organic framework of M2(dobpdc) where M is selected from the group of metals consisting of Mg, Ca, Mn, Cr, Fe, Co, Ni, Cu and Zn, the framework having coordinatively unsaturated metal centers; and (b) a plurality of ligands disposed within pores of the metal-organic framework to produce a functionalized framework, said ligands having a ligand bridge with at least one first functional group capable of adsorbing a gas and at least one second functional group coupled to at least one metal center of said metal-organic framework; (c) wherein contact of the functionalized framework with a volume of gases produces a stepped adsorption isotherm; and (d) wherein gas adsorption properties before and after each step cannot be modeled as a continuous Langmuir function. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A porous organic framework (MOF) adsorbent for carbon dioxide gas separations, comprising:
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(a) a porous metal-organic framework of M2(dobpdc) where M is selected from the group of metals consisting of Mg, Ca, Mn, Cr, Fe, Co, Ni, Cu and Zn, the framework having coordinatively unsaturated metal centers; and (b) a plurality of ligands disposed within pores of the metal-organic framework, coupled to at least one metal center of said metal-organic framework, to produce a functionalized framework, said ligands comprising at least two functional groups separated by a ligand bridge, each functional group having at least one reactive atom of nitrogen that contains one or more lone pairs of electrons; (c) wherein contact of the functionalized framework with a volume of gases produces a stepped adsorption isotherm; and (d) wherein gas adsorption properties before and after each step cannot be modeled as a continuous Langmuir function. - View Dependent Claims (13, 14, 15, 16, 17, 18)
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Specification