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Highly porous organic–inorganic hybrid silica and its titanium silicate analogs as efficient liquid-phase oxidation catalysts

Paper ID Volume ID Publish Year Pages File Format Full-Text
43009 45951 2008 6 PDF Available
Title
Highly porous organic–inorganic hybrid silica and its titanium silicate analogs as efficient liquid-phase oxidation catalysts
Abstract

Vinyltrimethoxysilane was polymerized under non-aqueous conditions through radical initiation. The resulting polymer was used as precursor in the presence of self-assembly of cationic surfactant cetyltrimethylammonium bromide (CTAB) to obtain the mesoporous organic–inorganic hybrid polyvinylsiloxane (HPVS-1). An identical synthesis procedure was followed together with the addition of different amounts of titanium(IV) source in the synthesis gels to obtain its titanium silicate analogs (Ti-HPVS-1). XRD, TEM and N2 sorption measurements suggested highly porous wormhole-like disordered framework structures with high BET surface areas for these materials. Solid-state 29Si MAS NMR, UV–vis and FT IR spectroscopic tools and ICP-OES elemental analysis were used to characterize these materials. Spectroscopic results suggested the incorporation of isolated tetrahedral Ti(IV) sites in the organically modified hybrid silica frameworks. Ti-HPVS-1 showed excellent catalytic activity and high selectivity in the liquid-phase oxidation of R-(−)-carvone to the corresponding epoxide, using dilute aqueous H2O2 as oxidant.

Graphical abstractVinyltrialkoxysilane was polymerized under non-aqueous conditions. This polymeric precursor was used for the synthesis of organic–inorganic hybrid mesoporous silica and its titanium silicate analogs. Titanium containing hybrid materials showed good catalytic activity and epoxide selectivity in the liquid-phase oxidation of R-(−)-carvone using dilute aqueous H2O2 as oxidant.Figure optionsDownload full-size imageDownload as PowerPoint slide

Keywords
Mesoporous materials; Organic–inorganic hybrid; Titanium silicate; Epoxidation
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Highly porous organic–inorganic hybrid silica and its titanium silicate analogs as efficient liquid-phase oxidation catalysts
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis A: General - Volume 342, Issues 1–2, 30 June 2008, Pages 29–34
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