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COOPERATIVE CHEMICAL ADSORPTION OF ACID GASES IN FUNCTIONALIZED METAL-ORGANIC FRAMEWORKS

United States Patent Application

20170087531
A1
View the Complete Application at the US Patent & Trademark Office
A system and method for acid gas separations using porous frameworks of metal atoms coordinatively bound to polytopic linkers that are functionalized with basic nitrogen ligands that expose nitrogen atoms to the pore volumes forming adsorption sites. Adjacent basic nitrogen ligands on the metal-organic framework can form an ammonium from one ligand and a carbamate from the other. The formation of one ammonium carbamate pair influences the formation of ammonium carbamate on adjacent adsorption sites. Adsorption of acid gas at the adsorption sites form covalently linked aggregates of more than one ammonium carbamate ion pair. The acid gas adsorption isotherm can be tuned to match the step position with the partial pressure of acid gas in the gas mixture stream through manipulation of the metal-ligand bond strength by selection of the ligand, metal and polytopic linker materials.
Long, Jeffrey R. (Oakland, CA), McDonald, Thomas M. (Berkeley, CA)
THE REGENTS OF THE UNIVERSITY OF CALIFORNIA (Oakland CA)
15/ 297,114
October 18, 2016
STATEMENT REGARDING FEDERALLY SPONSORED RESEARCH OR DEVELOPMENT [0003] This invention was made with Government support under DE-AR0000103 and DE-AR0000402 awarded by the Advanced Research Projects Agency-Energy (ARPA-E), U.S. Department of Energy, and under DE-AC02-06CH11357 awarded by the U.S. Department of Energy, Office of Science, Office of Basic Energy Sciences. The Government has certain rights in the invention.