Title: Enthalpic effects in the adsorption of alkylaromatics on the metal-organic frameworks MIL-47 and MIL-53
Authors: Vermoortele, Frederik ×
Boulhout, Mohammed
Boudewijns, Tom
Kirschhock, Christine
Ameloot, Rob
Beurroies, Isabelle
Denoyel, Renaud
De Vos, Dirk #
Issue Date: Jul-2012
Publisher: Elsevier
Series Title: Microporous and Mesoporous Materials vol:157 pages:82-88
Abstract: This work reports on the adsorptive separation of mono- and disubstituted alkylaromatics with various alkyl groups in the microporous metal-organic frameworks MIL-47 ((VO)-O-IV{O2C-C6H4-CO2}) and MIL-53 (Al-III(OH){O2C-C6H4-CO2}). The mechanisms underlying the adsorption selectivity are investigated via determination of the adsorption enthalpies at low or high loading, either via pulse chromatographic or calorimetric methods. Results of both methods are in fair agreement. It is shown that the strong preference of MIL-47 for n-propylbenzene over cumene is due to a more favorable adsorption enthalpy. In addition, upon adsorbing n-alkylbenzenes with increasing alkyl chain length a stepwise increase in adsorption enthalpy is observed, which possibly indicates the importance of alkyl chain length in spanning the distance between adjacent, regularly spaced interaction sites in the crystal lattice. Finally, we also study the adsorption enthalpies of various xylene isomers and ethylbenzene on MIL-47 and MIL-53. It is found that enthalpic as well as entropic effects play an important role in determining the adsorption selectivity. (C) 2011 Published by Elsevier Inc.
ISSN: 1387-1811
Publication status: published
KU Leuven publication type: IT
Appears in Collections:Centre for Surface Chemistry and Catalysis
× corresponding author
# (joint) last author

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