Journal
CATALYSIS TODAY
Volume 208, Issue -, Pages 97-105Publisher
ELSEVIER
DOI: 10.1016/j.cattod.2012.09.037
Keywords
Metal-organic frameworks; Vanadium; Titanium; Oxidation catalysis
Funding
- Long Term Structural Methusalem Grant [01M00409]
- Flemish Government
- Ghent University, GOA [01G00710]
- Research Foundation Flanders (FWO-Vlaanderen) [G.0700.08, IAP 6/27]
- European Research Council (ERC) [240483]
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In this paper, we describe the post-functionalization of a V-containing Metal-organic framework with TiO(acac)(2) to create a bimetallic oxidation catalyst. The catalytic performance of this V/Ti-MOF was examined for the oxidation of cyclohexene using molecular oxygen as oxidant in combination with cyclohexanecarboxaldehyde as co-oxidant. A significantly higher cyclohexene conversion was observed for the bimetallic catalyst compared to the non-functionalized material. Moreover, the catalyst could be recycled at least 3 times without loss of activity and stability. No detectable leaching of V or Ti was noted. Electron paramagnetic resonance measurements were performed to monitor the fraction of V-ions in the catalyst in the +IV valence state. A reduction of this fraction by similar to 17% after oxidation catalysis is observed, in agreement with the generally accepted mechanism for this type of reaction. (C) 2012 Elsevier B.V. All rights reserved.
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