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US 11,679,373 B2Granted
Water stable copper paddlewheel metal organic framework (MOF) compositions and processes using the MOFs
AssigneeNuMat Technologies, Inc.
InventorsMitchell Hugh Weston, Edwin Alfonso Argueta Fajardo
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Abstract
This invention relates to a Cu-BTC MOF which is water stable. The Cu-BTC MOF has been modified by substituting some of the BTC ligand (1,3,5, benzene tricarboxylic acid) with 5-aminoisophthalic acid (AIA). The resultant MOF retains at least 40% of its as synthesized surface area after exposure to liquid water at 60° C. for 6 hours. This is an unexpected result versus the MOF containing only the BTC ligand. This MOF can be used to abate contaminants such as ammonia in gas streams and especially air streams.
Claims7
A process for purifying a gaseous stream:
- the process comprising contacting the gaseous stream comprising at least one contaminant selected from ammonia, hydrogen sulfide, hydrogen cyanide, cyanogen chloride, chlorine, nitrogen dioxide, hydrazine, arsine, phosgene, phosphine, and boron trifluoride with a metal organic framework material (MOF) which is:
- a coordination product of a copper metal ion and a mixture of organic ligands selected from 1,3,5-benzenetricarboxylic acid (BTC) and 5-aminoisophthalic acid (AIA) (Cu-BTC-AIA);
- to at least partially remove the contaminant from the gaseous stream and provide a purified gaseous stream wherein the MOF has an as synthesized Brunauer-Emmett-Teller (BET) surface area of at least 1700 m2/g and wherein the MOF is further characterized in that it retains at least 40% of its as synthesized surface area after exposure to liquid water at 60 C for 6 hours.
Dependencies are inferred from the claim text.