Green methods for preparing highly CO2 selective and H2S tolerant metal organic frameworks
A green route for preparing a metal organic framework include mixing metal precursor with a ligand precursor to form a solvent-free mixture; adding droplets of water to the mixture; heating the mixture at a first temperature after adding the water; and isolating the metal organic framework material including the metal and the ligand.
1. A method for preparing a metal organic framework comprising:
mixing a solid metal precursor with a solid ligand precursor to form a mixture of the solid precursors, wherein the solid metal precursor includes M-SiF 6 , wherein M includes a metal;
wetting the mixture of the solid precursors with one or more drops of water; and
heating the wetted mixture at a first temperature to obtain a two-dimensional metal organic framework intermediate structure.
2. The method of claim 1 , wherein the metal of the solid metal precursor is selected from a group consisting of Ni, Cu, Zn, Fe, and Co.
3. The method of claim 1 , wherein the metal includes Ni.
4. The method of claim 1 , wherein the solid ligand precursor includes pyrazine, 4,4′-Bipyridin, 1,4-Diazabicyclo[2.2.2]octane, or 1,2-bis(4-pyridyl)acetylene.
5. The method of claim 1 , wherein the solid ligand precursor includes a nitrogen-containing heterocyclic ligand.
6. The method of claim 1 , wherein the molar ratio of the solid ligand precursor to the metal precursor is about 3:1 to about 6:1.
7. The method of claim 1 , further comprising forming SIFSIX-Ni-3 metal organic framework.
8. The method of claim 1 , wherein the two-dimensional metal organic framework intermediate structure is H 2 S tolerant.
9. A method for preparing a metal organic framework comprising:
mixing a solid metal precursor with a solid ligand precursor to form a mixture of the solid precursors, wherein the solid metal precursor includes M-SiF 6 , wherein M includes a metal;
wetting the mixture of the solid precursors with one or more drops of water; and
heating the wetted mixture at a first temperature and thereafter further heating the wetted mixture to a second temperature to obtain a three-dimensional metal organic framework structure.
10. The method of claim 9 , wherein the metal of the solid metal precursor is selected from a group consisting of Ni, Cu, Zn, Fe, and Co.
11. The method of claim 9 , wherein the metal includes Ni.
12. The method of claim 9 , wherein the solid ligand precursor includes pyrazine, 4,4′-Bipyridin, 1,4-Diazabicyclo[2.2.2]octane, or 1,2-bis(4-pyridyl)acetylene.
13. The method of claim 9 , wherein the solid ligand precursor includes a nitrogen-containing heterocyclic ligand.
14. A method for preparing a metal organic framework comprising:
mixing a metal precursor with a ligand precursor to form a mixture, wherein the metal precursor includes NiSiF 6 and the ligand precursor includes pyrazine;
adding water to the mixture;
heating the mixture at a first temperature after the water is added to the mixture; and heating the mixture to a second temperature to obtain a three-dimensional metal organic framework structure.
15. The method of claim 9 , further comprising forming SIFSIX-Ni-3 metal organic framework.
16. The method of claim 9 , wherein the three-dimensional metal organic framework intermediate structure is H 2 S tolerant.
17. The method of claim 9 , wherein the first temperature is less than the second temperature.
18. The method of claim 14 , wherein the first temperature is less than the second temperature.
19. The method of claim 9 , wherein the solid metal precursor includes one or more of NiSiF 6 , CuSiF 6 , ZnSiF 6 , CoSiF 6 , and FeSiF 6 .
20. The method of claim 14 , wherein the solid metal precursor includes one or more of NiSiF 6 , CuSiF 6 , ZnSiF 6 , CoSiF 6 , and FeSiF 6 .