Compositions, Systems, and Methods for Sequestering CO2 from Combustion Flue Gas
Systems for recovering CO 2 from a combustion gas stream are provided. Compositions are also provided; the compositions can include: a nanoporous framework composition; a ligand associated with the nanoporous framework composition; and CO 2 associated with the one or both of the ligand and the nanoporous framework composition. Methods for separating CO 2 from a combustion stream are also provided.
1 . A system for recovering CO 2 from a combustion gas stream, the system comprising:
a combustion stream comprising CO 2 and N 2 ;
a vessel operatively coupled to the combustion stream, the vessel containing a nanoporous framework composition associated with a ligand; and
a vessel outlet stream operatively engaged with the vessel.
2 . The system of claim 1 wherein the nanoporous framework composition comprises a metal organic composition.
3 . The system of claim 2 wherein the metal organic composition comprises a metal organic framework (MOF).
4 . The system of claim 2 wherein the nanoporous framework composition comprises clusters coupled by linkers, wherein the clusters comprise metal elements.
5 . The system of claim 4 wherein the ligands are associated with one or both of the clusters and linkers.
6 . The system of claim 1 wherein the nanoporous framework composition comprises clusters coupled by linkers and the clusters are non-metal.
7 . The system of claim 6 wherein the clusters are covalently linked to the linkers.
8 . The system of claim 1 wherein the ligand comprises at least one —NH— moiety.
9 . The system of claim 8 wherein the ligand comprises CH 3 NHCH 2 CH 2 NHCH 3 .
10 . The system of claim 8 wherein the lone pairs of the —NH— moiety are associated with the clusters or linkers of the nanoporous framework composition.
11 . A composition comprising:
a nanoporous framework composition;
a ligand associated with the nanoporous framework composition; and
CO 2 associated with the one or both of the ligand and the nanoporous framework composition.
12 . The composition of claim 11 wherein the nanoporous framework composition comprises a metal organic framework.
13 . The composition of claim 12 wherein the metal organic framework comprises clusters coupled by linkers, wherein the clusters comprise metal elements.
14 . The composition of claim 13 wherein the ligands are associated with one or both of the clusters and linkers.
15 . The composition of claim 11 wherein the ligand comprises at least one —NH— moiety.
16 . The composition of claim 15 wherein the ligand comprises CH 3 NHCH 2 CH 2 NHCH 3 .
17 . The composition of claim 15 wherein the lone pairs of the —NH— moiety are associated with the clusters or linkers of the nanoporous framework composition.
18 . A method for separating CO 2 from a combustion stream, the method comprising:
charging a vessel containing a nanoporous framework composition with components of a combustion stream, at least two of the components comprising CO 2 and N 2 ;
discharging in the first of at least two steps, at least some of the N 2 while retaining CO 2 associated with the metal organic composition; and
discharging in a second of the at least two steps, at least some of the retained CO 2 to a provide a stream of CO 2 substantially free of N 2 .
19 . The method of claim 18 wherein the combustion stream comprises the CO 2 and the N 2 and O 2 .
20 . The method of claim 18 wherein the nanoporous framework composition comprises a metal organic framework associated with a plurality of ligands, the method comprising associating the CO 2 with one or both the metal organic framework and/or the ligand.
21 . The method of claim 20 wherein the metal organic framework is comprised of clusters associated by linkers, the CO 2 being associated with one or both the clusters and/or linkers.
22 . The method of claim 20 wherein the nanoporous framework composition comprises clusters and linkers.
23 . The method of claim 20 wherein the CO 2 is associated with a —NH— moiety of the ligand.
24 . The method of claim 18 wherein the combustion stream is substantially free of water.
25 . A system for recovering CO 2 from a combustion gas stream, the system comprising:
a combustion stream comprising CO 2 and N 2 ;
a vessel operatively coupled to the combustion stream, the vessel containing material comprising one or more of activated carbons, carbon molecular sieves, carbon nanotubes, natural and synthetic zeolites (i.e., alkali metal aluminosilicates), aluminophosphate materials, and/or mesoporous silica; and
a vessel outlet stream operatively engaged with the vessel.
26 . The system of claim 25 wherein the material further comprises self assembled ligands.
27 . The system of claim 26 wherein the ligands are coupled to the material.
28 . The system of claim 26 wherein the ligands comprise Si.
29 . The system of claim 26 wherein the ligands comprise —NH— moiety.
30 . A method for separating CO 2 from a combustion stream, the method comprising:
charging a vessel with components of a combustion stream, at least two of the components comprising CO 2 and N 2 ; and the vessel containing a material comprising one or more of activated carbons, carbon molecular sieves, carbon nanotubes, natural and synthetic zeolites (i.e., alkali metal aluminosilicates), aluminophosphate materials, and/or mesoporous silica;
discharging in the first of at least two steps, at least some of the N 2 while retaining CO 2 associated with the metal organic composition; and
discharging in a second of the at least two steps, at least some of the retained CO 2 to a provide a stream of CO 2 substantially free of N 2 .
31 . The method of claim 30 wherein the material further comprises self assembled ligands.
32 . The method of claim 31 wherein the ligands are coupled to the material.
33 . The method of claim 31 wherein the ligands comprise Si.
34 . The method of claim 31 wherein the ligands comprise —NH— moiety.
35 . The method of claim 30 wherein the combustion stream is substantially free of water.