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Development of [60] fullerene supported on silica catalysts for the photo-oxidation of alkenes

Paper ID Volume ID Publish Year Pages File Format Full-Text
42363 45922 2010 10 PDF Available
Title
Development of [60] fullerene supported on silica catalysts for the photo-oxidation of alkenes
Abstract

Simple or successive incipient wetness impregnation followed by heating at 180 °C is proved an efficient preparation method for dispersing effectively onto the silica surface various amounts of C60 in the range 1–4% (w/w). BET, XRD, DRS, TGA, microelectrophoresis and photoluminescence have been used to characterize the photocatalysts prepared. A high dispersion was obtained for the quite stable supported C60 phase, comprised mainly from relatively small or medium size C60 clusters/aggregates. The photocatalytic activity was assessed in the singlet oxygen oxidation of alkenes by examining the photo-oxygenation of 2-methyl-2-heptene as a probe reaction. The catalytic tests were carried out at 0–5 °C in CH3CN, under oxygen atmosphere and using a 300 W xenon lamp as the light source. The heterogeneous catalysts obtained were proved to be active in the photocatalytic oxidation of olefins via a 1O2 ene reaction. The catalysts exhibited significant conversion, turnover number and turnover frequency values, substantially higher than those achieved over the unsupported C60. The conversion increases with the amount of the supported C60 up to a value equal to 3% (w/w) and then it decreases whereas turnover number and turnover frequency decreases monotonically as the amount of the supported C60 increases. The easy separation of these solid catalysts from the reaction mixture, the high activity and stability as well as the retained activity in subsequent catalytic cycles, make these supported catalysts suitable for a small-scale synthesis of fine chemicals.

Graphical abstractIncipient wetness impregnation is an efficient method for supporting various amounts of C60 onto the silica surface. The immobilization of C60 on SiO2 increases considerably its catalytic activity for the photo-oxidation of alkenes. The easy separation of these catalysts from the reaction mixture and the retained activity in subsequent catalytic cycles make these catalysts suitable for fine chemicals small-scale synthesis.Figure optionsDownload full-size imageDownload high-quality image (104 K)Download as PowerPoint slide

Keywords
C60; Photocatalysis; Singlet oxygen; Photo-oxidation; DRS; Supported catalysts; Supported C60; Photoluminescence; TGA; Ene reaction; SiO2
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Development of [60] fullerene supported on silica catalysts for the photo-oxidation of alkenes
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis A: General - Volume 372, Issue 1, 5 January 2010, Pages 16–25
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Catalysis
Get Full-Text Now
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