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Oxidation of ethylbenzene to acetophenone by a Mn catalyst supported on a modified nanosized SiO2/Al2O3 mixed-oxide in supercritical carbon dioxide

Paper ID Volume ID Publish Year Pages File Format Full-Text
46639 46444 2012 10 PDF Available
Title
Oxidation of ethylbenzene to acetophenone by a Mn catalyst supported on a modified nanosized SiO2/Al2O3 mixed-oxide in supercritical carbon dioxide
Abstract

The selective oxidation of ethylbenzene to acetophenone with tert-butyl hydroperoxide in the presence of an SiO2/Al2O3-supported manganese catalyst occurs with a conversion of 91% and a selectivity of 98%, in the absence of an organic solvent, in supercritical carbon dioxide. The catalysts could be reused at least eight times without significant loss of activity. This procedure simplifies the isolation of the reaction products and has the advantage of using only carbon dioxide as a solvent under mild conditions. The electrochemical data for Mn nanocatalysts immobilized at the surface of multi-walled carbon nanotubes were also studied. The results indicate that the Mn catalysts anchored on the modified SiO2/Al2O3 mixed-oxide via 2-aminoethyl-3-aminopropyltrimethoxysilane (2-AE-3-APTMS) have an easily oxidizable environment, lower oxidation potential and lower charge-transfer resistance, thus leading to a higher catalytic activity and selectivity than when 3-aminopropyltrimethoxysilane (3-APTES) is used.

Graphical abstractFigure optionsDownload full-size imageDownload as PowerPoint slideHighlights► The Mn catalysts immobilized on functionalized nanosized SiO2-Al2O3 used as catalysts. ► The Mn catalysts were studied in the oxidation of ethylbenzene to acetophenone. ► Without organic solvent in supercritical carbon dioxide. ► The conversion and selectivity reached to 91 and 98%, respectively. ► Electrochemical behavior of the Mn nanocatalysts was studied.

Keywords
Supercritical carbon dioxide; Mn nanocatalyst; Ethylbenzene; Acetophenone; Oxidation
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Oxidation of ethylbenzene to acetophenone by a Mn catalyst supported on a modified nanosized SiO2/Al2O3 mixed-oxide in supercritical carbon dioxide
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis B: Environmental - Volumes 119–120, 30 May 2012, Pages 81–90
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
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