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Liquid-Phase Adsorption and Separation of Xylene Isomers by the Flexible Porous Metal–Organic Framework MIL-53(Fe)
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El Osta, Racha, Carlin-Sinclair, Abel, Guillou, Nathalie, Walton, Richard I., Vermoortele, Frederik, Maes, Michaël, de Vos, Dirk and Millange, Franck (2012) Liquid-Phase Adsorption and Separation of Xylene Isomers by the Flexible Porous Metal–Organic Framework MIL-53(Fe). Chemistry of Materials, Volume 24 (Number 14). pp. 2781-2791. doi:10.1021/cm301242d ISSN 0897-4756.
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Official URL: http://dx.doi.org/10.1021/cm301242d
Abstract
We report a study of the use of the porous metal–organic framework material MIL-53(Fe), FeIII(OH)0.8F0.2[O2C–C6H4–CO2], for the separation of BTEX mixtures (benzene, toluene, ethylbenzene, and the three xylene isomers). Crystal structures of the three host:guest materials MIL-53(Fe)[xylene], where xylene = the ortho, meta, or para isomer of dimethylbenzene, have been solved and refined from powder X-ray diffraction. Each exhibits a fully expanded form with a variety of host:guest and guest:guest interactions responsible for stabilizing the structure. While the ortho- and meta- isomers present a similar arrangement when occluded in the MIL-53 host, the para-xylene shows a distinctly different set of interactions with the host. Upon thermal treatment, xylenes are partially lost to give crystalline phases MIL-53(Fe)[xylene]0.5, the structures of which have also been solved. The kinetics of uptake of each xylene by MIL-53(Fe)[H2O], in which the water is replaced by the organic guest, have been studied using time-resolved energy-dispersive X-ray diffraction: this shows differences in kinetics of the adsorption of the three isomers. Under chromatographic conditions in heptane at 293 K, anhydrous MIL-53(Fe) is able to separate the three xylene isomers with elution of the para-xylene before the other two isomers, and at 323 K the host is able to resolve all components of the BTEX mixture.
Item Type: | Journal Article | ||||
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Divisions: | Faculty of Science, Engineering and Medicine > Science > Chemistry | ||||
Journal or Publication Title: | Chemistry of Materials | ||||
Publisher: | American Chemical Society | ||||
ISSN: | 0897-4756 | ||||
Official Date: | 24 July 2012 | ||||
Dates: |
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Volume: | Volume 24 | ||||
Number: | Number 14 | ||||
Page Range: | pp. 2781-2791 | ||||
DOI: | 10.1021/cm301242d | ||||
Status: | Peer Reviewed | ||||
Publication Status: | Published | ||||
Access rights to Published version: | Restricted or Subscription Access | ||||
Funder: | European Community (EC), FWO-Vlaanderen , IAP (Belspo), KULeuven | ||||
Grant number: | 228862 (EC); 6/27 (IAP) |
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