Trace and low concentration CO
In general, this disclosure describes techniques for removing trace and low concentration CO 2 from fluids using SIFSIX-n-M MOFs, wherein n is at least two and M is a metal. In some embodiments, the metal is zinc or copper. Embodiments include devices comprising SIFSIX-n-M MOFs for removing CO 2 from fluids. In particular, embodiments relate to devices and methods utilizing SIFSIX-n-M MOFs for removing CO 2 from fluids, wherein CO 2 concentration is trace. Methods utilizing SIFSIX-n-M MOFs for removing CO 2 from fluids can occur in confined spaces. SIFSIX-n-M MOFs can comprise bidentate organic ligands. In a specific embodiment, SIFSIX-n-M MOFs comprise pyrazine or dipryidilacetylene ligands.
1. A method of removing CO 2 from a fluid, the method comprising:
contacting a SIFSIX-3-Cu metal-organic framework with a fluid;
sorbing CO 2 from the fluid with the SIFSIX-3-Cu metal-organic framework; and desorbing CO 2 from the SIFSIX-3-Cu metal-organic framework.
2. A method of removing CO 2 from a fluid, the method comprising:
contacting a SIFSIX-3-Cu metal-organic framework with a fluid; and
sorbing CO 2 from the fluid.
3. The method of claim 2 , wherein the method further comprises desorbing CO 2 .
4. The method of claim 2 , wherein the concentration of CO 2 in the fluid is less than 10%.
5. The method of claim 2 , wherein sorbing comprises reducing the CO 2 concentration in the fluid to less than about 1%.
6. The method of claim 2 , wherein sorbing occurs in a confined space.
7. The method of claim 2 , wherein the fluid is breathing air.
8. The method of claim 2 , wherein the CO 2 in the fluid has a partial pressure less than 100 mbar.
9. The method of claim 2 , wherein the fluid further comprises one or more of water, N 2 , O 2 , and H 2 .
10. The method of claim 9 , wherein sorbing CO 2 occurs selectively over one or more of water, N 2 , O 2 , and H 2 .
11. The method of claim 10 , wherein sorbing CO 2 occurs in the presence of humidity and selectivity for CO 2 is not affected.
12. The method of claim 2 , further comprising one or more SIFSIX-n-M compositions, wherein n is at least 2 and M is a metal.
13. The method of claim 12 , wherein the metal comprises Cu, Zn, Co, Mn, Mo, Cr, Fe, Ca, Ba, Cs, Pb, Pt, Pd, Ru, Rh, or Cd.
14. The method of claim 12 , wherein n is 3.
15. The method of claim 12 , wherein at least one of the one or more SIFSIX-n-M compositions comprise bidentate organic ligands.
16. The method of claim 12 , wherein at least one of the one or more SIFSIX-n-M compositions comprise pyrazine or dipryidilacetylene ligands.
17. The method of claim 12 , wherein at least one of the one or more SIFSIX-n-M compositions comprise a SIFSIX-3-Zn metal organic framework.
18. The method of claim 12 , wherein one or more of the SIFSIX-3-Cu metal-organic framework and one or more SIFSIX-n-M compositions are included in a regeneratable cartridge of an anesthetic system or in a catalyst layer of an alkaline fuel cell, wherein the sorbing occurs in the anesthetic system or the alkaline fuel cell, respectively.
19. The method of claim 12 , wherein at least one of the one or more SIFSIX-n-M compositions comprise bidentate N-donor organic ligands.
20. The method of claim 19 , wherein the bidentate N-donor organic ligands each comprise a cyclic moiety.