Title: Tuning the catalytic performance of metal-organic frameworks in fine chemistry by active site engineering
Authors: Vermoortele, Frederik ×
Ameloot, Rob
Alaerts, Luc
Matthessen, Roman
Carlier, Bert
Fernandez, Enrique V. Ramos
Gascon, Jorge
Kapteijn, Freek
De Vos, Dirk #
Issue Date: 2012
Publisher: Royal Society of Chemistry
Series Title: Journal of Materials Chemistry vol:22 issue:20 pages:10313-10321
Abstract: The effect of a post-synthetic acid treatment on the catalytic performance of MOFs is evaluated for MIL-100(Fe), an iron-benzenetricarboxylate. The acid-treated frameworks are structurally robust as no differences have been found in XRD patterns after treatment. Porosity of the acid-treated MOFs gradually decreases, most probably as a consequence of anions remaining in the charged frameworks. Monitoring the modification of the MOFs by reactions of which the outcome depends on the acid properties of the catalyst suggests the presence of two types of active sites, with weak Bronsted acid sites in close vicinity to the Lewis acid open metal sites. This is supported by CO-chemisorption experiments which indicate a large increase of both Lewis and Bronsted acidity. In Diels-Alder reactions of oxygenated dienophiles with 1,3-cyclohexadiene, a strong increase of the activity is found for the acid-treated MOFs. This is explained by the enhanced activation of the dienophiles on the modified active sites.
ISSN: 0959-9428
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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