Geminal Coordinatively Unsaturated Sites on MOF‐808 for the Selective Uptake of Phenolics from a Real Bio‐Oil Mixture

The capping formate anions of the metal–organic framework (MOF) zirconium benzene‐1,3,5‐tricarboxylate (MOF‐808) were removed by a solvent exchange procedure, resulting in a formate‐free MOF‐808 sample containing “geminal” defects consisting of six coordinatively unsaturated sites (CUSs) on each of...

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Bibliographic Details
Published in:ChemSusChem 2019-03, Vol.12 (6), p.1256-1266
Main Authors: Jia, Chunmei, Cirujano, Francisco G., Bueken, Bart, Claes, Birgit, Jonckheere, Dries, Van Geem, Kevin M., De Vos, Dirk
Format: Article
Language:English
Subjects:
Adsorption
Benzene
biorefinery
Defects
Furfuryl alcohol
geminal coordinatively unsaturated sites
liquid separation
Metal-organic frameworks
metal–organic framework
phenol
Phenols
Zirconium
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Summary:The capping formate anions of the metal–organic framework (MOF) zirconium benzene‐1,3,5‐tricarboxylate (MOF‐808) were removed by a solvent exchange procedure, resulting in a formate‐free MOF‐808 sample containing “geminal” defects consisting of six coordinatively unsaturated sites (CUSs) on each of the Zr6 nodes. Adsorption experiments with this material showed that the uptake of 4‐methylguaiacol from a bio‐oil mixture was proportional to the number of defects and amounted to one mole adsorbed per mole of zirconium. The selective uptake behavior of MOF‐808 towards phenolic compounds was further evident from competitive adsorption experiments between furfuryl alcohol and 4‐methylguaiacol as well as from the excellent (20 wt % for phenolic compounds and
ISSN:1864-5631
1864-564X
DOI:10.1002/cssc.201802692