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Highly efficient tungsten trioxide containing mesocellular silica foam catalyst in the O-heterocyclization of cycloocta-1,5-diene with aqueous H2O2

Paper ID Volume ID Publish Year Pages File Format Full-Text
43434 45969 2007 8 PDF Available
Title
Highly efficient tungsten trioxide containing mesocellular silica foam catalyst in the O-heterocyclization of cycloocta-1,5-diene with aqueous H2O2
Abstract

WO3-containing mesocellular silica foam (MCF) catalysts have been synthesized via an in situ method by using tetraethyl orthosilicate (TEOS) and sodium tungstate as the precursors and via a traditional impregnation method. All catalysts are highly efficient in the O-heterocyclization of cycloocta-1,5-diene (COD) (see Scheme 1 in Section 3.2) to 2,6-dihydroxy-9-oxabicyclo[3.3.1]nonane (1) and 2-hydroxy-9-oxabicyclo[3.3.1]nonane-6-one (2) with a COD conversion up to 100% and (1 + 2) selectivity up to 98%. The WOx species are well dispersed in the W-containing catalysts via the in situ method with the WO3 loading up to 20 wt.%, as proved by XRD, TEM, Raman, and UV–vis DRS. TPR and XRD results show that the WO3–MCF catalysts derived from the in situ method show much stronger interactions between active tungsten oxide species and the MCF support than the WO3/MCF obtained by the traditional impregnation method. The in situ method-derived catalyst also shows far better stability than the impregnation one according to the results from the recycling experiment.

Graphical abstractWO3-containing mesocellular silica foam (MCF) catalysts have been synthesized via in situ synthesized method and traditional impregnated method. All catalysts are active in the O-heterocyclization of cycloocta-1,5-diene (COD) to 9-oxabicyclo[3.3.1]nonane-2,6-dioles and 2-hydroxy-9-oxabicyclo[3.3.1]nonane-6-one. It is demonstrated from the recycle experiment that the WO3–MCF catalysts show far better stability than the impregnated one.Figure optionsDownload full-size imageDownload as PowerPoint slide

Keywords
WO3-containing mesocellular silica foam (MCF) catalyst; Cycloocta-1,5-diene (COD); O-Heterocyclization; Hydrogen peroxide
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Highly efficient tungsten trioxide containing mesocellular silica foam catalyst in the O-heterocyclization of cycloocta-1,5-diene with aqueous H2O2
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis A: General - Volume 332, Issue 1, 1 November 2007, Pages 138–145
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Catalysis
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Don't Miss Today's Special Offer
Price was $35.95
You save - $31
Price after discount Only $4.95
100% Money Back Guarantee
Full-text PDF Download
Online Support
Any Questions? feel free to contact us