title: Adsorption study of CO2, CH4, N2, and H2O on an interwoven copper carboxylate metal-organic framework (MOF-14).
abstract: Metal-organic frameworks (MOFs) are attractive microporous materials for adsorption separations due to their extraordinary structures and impressive high surface areas. Catenation, or framework interpenetration, can significantly impact the crystal stability and improve the adsorption interactions. This interesting approach was used to obtain {[Cu(3)(BTB)(2)(H(2)O)(3)]·(DMF)(9)(H(2)O)(2)} (MOF-14) as a microporous material with a high surface area and large pore volume, which are desirable parameters for adsorption applications. Here, we report a detailed study of this catenated material with its gas adsorption properties. The potential for adsorption separations is evaluated by measuring pure-component adsorption isotherms for carbon dioxide, methane, and nitrogen. The Ideal Adsorbed Solution Theory (IAST) was used to evaluate adsorption selectivities of MOF-14 for CO(2)/CH(4) and CO(2)/N(2) equimolar mixtures. In addition, water adsorption and the impact of exposure on structural degradation are reported. Compared to other open-metal site MOFs, MOF-14 adsorbs significantly less water. This interwoven MOF is a promising competitor to other MOF materials in the gas separation field due to low interactions with water and high selectivity for CO(2) over N(2).
authors.affiliation: Georgia Institute of Technology, School of Chemical and Biomolecular Engineering, 311 Ferst Dr. NW, Atlanta, GA 30332, USA.
authors.forename: Jagadeswara R
authors.initials: JR
authors.lastname: Karra
authors.affiliation: Georgia Institute of Technology, School of Chemical and Biomolecular Engineering, 311 Ferst Dr. NW, Atlanta, GA 30332, USA.
authors.forename: Bogna E
authors.initials: BE
authors.lastname: Grabicka
authors.affiliation: Georgia Institute of Technology, School of Chemical and Biomolecular Engineering, 311 Ferst Dr. NW, Atlanta, GA 30332, USA.
authors.forename: You-Gui
authors.initials: YG
authors.lastname: Huang
authors.affiliation: Georgia Institute of Technology, School of Chemical and Biomolecular Engineering, 311 Ferst Dr. NW, Atlanta, GA 30332, USA. Electronic address: krista.walton@chbe.gatech.edu.
authors.forename: Krista S
authors.initials: KS
authors.lastname: Walton
mesh_terms: D000327:Adsorption; D002245:Carbon Dioxide / Q000737:chemistry*; D002264:Carboxylic Acids / Q000737:chemistry*; D056831:Coordination Complexes / Q000737:chemistry*; D003300:Copper / Q000737:chemistry*; D008697:Methane / Q000737:chemistry*; D008958:Models, Molecular; D009584:Nitrogen / Q000737:chemistry*; D013499:Surface Properties; D014867:Water / Q000737:chemistry*
chemical_list: D002264:Carboxylic Acids; D056831:Coordination Complexes; D014867:Water; D002245:Carbon Dioxide; D003300:Copper; D009584:Nitrogen; D008697:Methane