| Activation of the metal-organic framework MIL-47 for selective adsorption of xylenes and other difunctionalized aromatics. | |
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MedLine Citation:
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PMID: 18473046 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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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. |
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Authors:
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Luc Alaerts; Michael Maes; Pierre A Jacobs; Joeri F M Denayer; Dirk E De Vos |
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Publication Detail:
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Type: Journal Article; Research Support, Non-U.S. Gov't Date: 2008-04-02 |
Journal Detail:
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Title: Physical chemistry chemical physics : PCCP Volume: 10 ISSN: 1463-9076 ISO Abbreviation: Phys Chem Chem Phys Publication Date: 2008 May |
Date Detail:
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Created Date: 2008-05-13 Completed Date: 2008-08-05 Revised Date: - |
Medline Journal Info:
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Nlm Unique ID: 100888160 Medline TA: Phys Chem Chem Phys Country: England |
Other Details:
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Languages: eng Pagination: 2979-85 Citation Subset: IM |
Affiliation:
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Centre for Surface Chemistry and Catalysis, Katholieke Universiteit Leuven, Leuven, Belgium. |
Export Citation:
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APA/MLA Format Download EndNote Download BibTex |
| MeSH Terms | |
Descriptor/Qualifier:
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Adsorption Isomerism Organometallic Compounds / chemistry* Particle Size Polycyclic Hydrocarbons, Aromatic / chemistry* Porosity Pressure Surface Properties Temperature Time Factors Xylenes / chemistry* |
| Chemical | |
Reg. No./Substance:
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0/Organometallic Compounds; 0/Polycyclic Hydrocarbons, Aromatic; 0/Xylenes; 0/vanadium(IV) terephthalate |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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