Alkylamine functionalized metal-organic frameworks for composite gas separations
AssigneeThe Regents of the University of California
InventorsJeffrey R. Long, Thomas M. McDonald, Deanna M. D'Alessandro
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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.
Claims3
An adsorption material, comprising:
- a porous metal-organic framework;
- and
- a plurality of ligands within the pores of the metal-organic framework, each ligand having at least one basic nitrogen group;
- wherein the basic nitrogen groups are configured to selectively adsorb CO2 from a stream of mixed gases at pressures below 3 bar and CO2 partial pressures between 1 and 1000 mbar.
A method of separating a mixture stream comprising CO2 and N2, the method comprising:
- contacting the mixture stream comprising CO2 and N2 with a material comprising a metal-organic framework, and a ligand with a basic nitrogen group;
- wherein the material has an isosteric heat of CO2 adsorption of greater than −60 kJ/mol at zero coverage using a dual-site Langmuir model;
- obtaining a stream richer in CO2 as compared to the mixture stream;
- and
- obtaining a stream richer in N2 as compared to the mixture stream.
A method of separating a mixture stream comprising CO2 and other combustion gases, the method comprising:
- contacting the mixture stream comprising CO2 and N2 with a material comprising a metal-organic framework and a plurality of ligands that have at least one basic nitrogen group;
- obtaining a stream richer in CO2 as compared to the mixture stream;
- and
- obtaining a stream richer in N2 as compared to the mixture stream.
Dependencies are inferred from the claim text.