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Activation of the metal-organic framework MIL-47 for selective adsorption of xylenes and other difunctionalized aromatics

journal contribution
posted on 2023-02-07, 00:25 authored by Luc Alaerts, Michael Maes, Pierre A Jacobs, Joeri FM Denayer, Dirk E De Vos
The capacity and selectivity of the metal-organic framework MIL-47 for liquid phase adsorption are shown to heavily depend on the pretreatment of the material, as illustrated in detail by the particular case of selective xylene adsorption. By totally removing the uncoordinated terephthalic acid from the pores and simultaneously avoiding oxidation to nonporous V(2)O(5), pore volume and uptake of xylenes can be maximized. The presence of uncoordinated terephthalic acid in the pores improves the selectivity between p- and m-xylene. Calcination bed thickness and oven geometry influence the optimal calcination procedure. The physicochemical modifications of MIL-47 during its activation are investigated in detail with XRD, SEM, nitrogen physisorption, TGA and diffuse reflectance UV-Vis spectroscopy. Using optimally pretreated MIL-47 as adsorbent for xylene, ethyltoluene, dichlorobenzene, toluidine or cresol isomers, the para-isomer is in each case preferred over the meta-isomer in pulse chromatographic and batch experiments. The role of stacking in the selective adsorption of these isomers is discussed. In the case of the dichlorobenzenes, the meta- and para-isomers can be separated in a breakthrough experiment with a selectivity of 5.0.

History

Journal

PHYSICAL CHEMISTRY CHEMICAL PHYSICS

Volume

10

Pagination

2979-2985

Location

England

ISSN

1463-9076

eISSN

1463-9084

Language

English

Issue

20

Publisher

ROYAL SOC CHEMISTRY