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Mixed gas adsorption of carbon dioxide and methane on a series of isoreticular microporous metal–organic frameworks based on 2-substituted imidazolate-4-amide-5-imidates

  • In this work the adsorption of CO2 and CH4 on a series of isoreticular microporous metal–organic frameworks based on 2-substituted imidazolate-4-amide-5-imidates, IFP-1–IFP-6 (IFP = Imidazolate Framework Potsdam), is studied firstly by pure gas adsorption at 273 K. All experimental isotherms can be nicely described by using the Tòth isotherm model and show the preferred adsorption of CO2 over CH4.In this work the adsorption of CO2 and CH4 on a series of isoreticular microporous metal–organic frameworks based on 2-substituted imidazolate-4-amide-5-imidates, IFP-1–IFP-6 (IFP = Imidazolate Framework Potsdam), is studied firstly by pure gas adsorption at 273 K. All experimental isotherms can be nicely described by using the Tòth isotherm model and show the preferred adsorption of CO2 over CH4. At low pressures the Tòth isotherm equation exhibits a Henry region, wherefore Henry's law constants for CO2 and CH4 uptake could be determined and ideal selectivity αCO2/CH4 has been calculated. Secondly, selectivities were calculated from mixture data by using nearly equimolar binary mixtures of both gases by a volumetric–chromatographic method to examine the IFPs. Results showed the reliability of the selectivity calculation. Values of αCO2/CH4 around 7.5 for IFP-5 indicate that this material shows much better selectivities than IFP-1, IFP-2, IFP-3, IFP-4 and IFP-6 with slightly lower selectivity αCO2/CH4 = 4–6. The preferred adsorption of CO2 over CH4 especially of IFP-5 and IFP-4 makes these materials suitable for gas separation application.show moreshow less

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Metadaten
Author:Franziska Debatin, Jens MöllmerGND, Suvendu Sekhar Mondal, Karsten Behrens, Andreas Möller, Reiner StaudtGND, Arne Thomas, Hans-Jürgen Holdt
Creating Corporation:Royal Society of Chemistry
Place of publication:Cambridge
Year of Publication:2012
Language:English
GND Keyword:Adsorption; Kohlendioxid; Metallorganisches Netzwerk; Methan
Parent Title (English):Journal of Materials Chemistry
Volume:22
Issue:20
ISSN:1364-5501
First Page:10221
Last Page:10227
Document Type:Article (reviewed)
Institutes:Bibliografie
Acces Right:Frei zugänglich
Release Date:2019/10/24
Licence (German):License LogoEs gilt das UrhG
URL:https://depositonce.tu-berlin.de/handle/11303/5706
DOI:https://doi.org/10.1039/C2JM15811F