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Ti-functionalized NH2-MIL-47: An effective and stable epoxidation catalyst

Paper ID Volume ID Publish Year Pages File Format Full-Text
54849 47028 2013 9 PDF Available
Title
Ti-functionalized NH2-MIL-47: An effective and stable epoxidation catalyst
Abstract

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 ∼17% after oxidation catalysis is observed, in agreement with the generally accepted mechanism for this type of reaction.

Graphical abstractFigure optionsDownload full-size imageDownload high-quality image (132 K)Download as PowerPoint slideHighlights► NH2-MIL-47 was successfully post-functionalized with TiO(acac)2. ► The bimetallic MOF exhibit enhanced catalytic activity, stability and regenerability. ► Partial oxidation of the V-sites was monitored by EPR spectroscopy. ► Mechanisms are proposed that explain the product distribution and the EPR results.

Keywords
Metal-organic frameworks; Vanadium; Titanium; Oxidation catalysis
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Ti-functionalized NH2-MIL-47: An effective and stable epoxidation catalyst
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Publisher
Database: Elsevier - ScienceDirect
Journal: Catalysis Today - Volume 208, 1 June 2013, Pages 97–105
Authors
, , , , , , , , , ,
Subjects
Physical Sciences and Engineering Chemical Engineering Catalysis
Get Full-Text Now
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Price was $35.95
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