High yield synthesis of metal-organic frameworks
AssigneeExxonMobil Technology and Engineering Company
InventorsCarter W. Abney, Anna C. Ivashko, Gerardo J. Majano
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Abstract
Metal-organic frameworks are synthesized from either a high concentration synthesis where reaction solutions comprising increased reagent concentrations, or suspensions of reagents which exceed their solubility limit in the reaction solution in a high solids synthesis. In both approaches, the solubility of reagent is maximized by inclusion of a buffer, fixing a nominal pH of the reaction solution to allow metal-organic framework formation. These methods improve yields and scale up of metal-organic frameworks.
Claims12
A method of making metal-organic frameworks comprising the steps of:
- dissolving a first amount of a plurality of solid reagents and a buffer different from the plurality of solid reagents in a solvent to provide a synthesis solution, wherein the solid reagents comprise at least one metal salt and at least one linker;
- and
- adding a second amount of the plurality of solid reagents to the synthesis solution to produce a reaction solution having an amount of reagent concentration, the amount of reagent concentration being between about 135 mM and 400 mM,
- wherein the at least one metal salt is selected from the group consisting of divalent salts of Mg, Ca, V, Mn, Cr, Fe, Co, Ni, Cu, and Zn,
- wherein the buffer is selected from the group consisting of 3-(N-morpholino) propanesulfonic acid (MOPS), Na-MOPS, and NaHCO3,
- wherein the solvent is selected from the group consisting of methanol, ethanol, isopropanol, n-butanol, N,N-dimethyl formamide, N,N-dimethylacetamide, tetrahydrofuran, acetonitrile, water, and combinations thereof, and
- the linker includes at least one para-carboxylate (“pc-linker”) selected from the group consisting of 4,4′-dioxidobiphenyl-3,3′-dicarboxylate (DOBPDC), 4,4″-dioxido-[1,1′:4′,1″-terphenyl]-3,3″-dicarboxylate (DOTPDC), dioxidobiphenyl-4,4′-dicarboxylate (para-[1,1′:4′,1″-terphenyl]-3,3″-dicarboxylate (DOTPDC), dioxidobiphenyl-4,4′-dicarboxylate (para-carboxylate-DOBPDC), and the following compounds:
Dependencies are inferred from the claim text.