UNS: ZIF Membranes with Gated-Ultramicropores for Gas Separation

Project: Research project

Description

Zeolitic Imidazolate Frameworks (ZIF), with structure similar to zeolites, are a promising group of microporous membrane materials for gas and liquid separation. However, in spite of a large number of ZIF materials, only a few ZIF materials have been made into membranes. These ZIF membranes still do not offer desired pore size for separation of some of industrially important gas mixture, such as of ethylene and ethane. Here we propose synthesis of ZIF membranes with gated-ultramicropores of tailorable pore size by a new membrane surface modification method for separation of mixtures of small gases with a close molecular sizes. The objectives of this project are to (1) understand the post-synthesis modification of ZIF-8 membranes through membrane surface ligand exchange, (2) synthesize and characterization of the modified ZIF-8 membranes for separations of small gas mixtures including that of ethylene/ethane. These studies will demonstrate a new membrane structure for gas separation and establish the foundation for the new surface ligand exchange method for synthesis of ZIF membranes with high separation capacity.
StatusFinished
Effective start/end date8/1/157/31/19

Funding

  • National Science Foundation (NSF): $300,000.00

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Gases
Membranes
Ethane
Gas mixtures
Pore size
Ligands
Zeolites
Membrane structures
Surface treatment
Ion exchange
Liquids