Rapid and enhanced activation of microporous coordination polymers by flowing supercritical co2
AssigneeThe Regents of the University of Michigan
InventorsAdam J. Matzger, Baojian Liu, Antek G. Wong-Foy
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Abstract
Flowing supercritical CO2 is used to activate metal organic framework materials (MOF). MOFs are activated directly from N,N-dimethylformamide (DMF) thus avoiding exchange with a volatile solvent. Most MCPs display increased surface areas directly after treatment although those with coordinatively unsaturated metal centers benefit from additional heating.
Claims21
A method for treating a solvent-containing metal organic framework material (MOF) to increase its internal surface area or porosity, comprising introducing CO2 into a vessel containing the solvent-containing MOF, and venting the CO2 while maintaining supercritical conditions for carbon dioxide in the vessel.
A method of making a porous material, comprising:
- a) combining a metal salt and an organic linker in a solvent or solvents of reaction in which both are soluble,
- b) exposing the combined metal salt and organic linker to conditions under which they react to form a porous material comprising a metal-organic framework,
- c) obtaining crystals of the porous material from the reaction mixture of step b), wherein the crystals comprise the metal-organic framework material and occluded solvent of reaction, and
- d) exposing the crystals to flowing supercritical carbon dioxide to remove occluded solvent from the crystals and provide an activated material.
A method of making and activating a porous material comprising a metal organic framework (MOF), comprising
- reacting a metal cation selected from Zn2+, Cu2+, Mg2+, Ni2+, Co2+, Mn2+ with an organic linker composition in a solvent to form a MOF material having occluded solvent of synthesis,
- optionally exposing the MOF material to a second solvent to exchange out the solvent of synthesis, and
- drying the MOF material by exposing the MOF material containing either the solvent of synthesis or the second solvent to conditions of flowing supercritical carbon dioxide to make the activated porous material.
A method for the treatment of a solvent-containing metal organic framework material (MOF) to increase its internal surface area or porosity, comprising introducing CO2 into a vessel containing the solvent-containing MOF, and venting the CO2 while maintaining conditions for liquid carbon dioxide in the vessel.
Dependencies are inferred from the claim text.