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Supported sulfonic acids: Metal-free catalysts for the oxidation of hydroquinones to benzoquinones with hydrogen peroxide

Paper ID Volume ID Publish Year Pages File Format Full-Text
41280 45883 2012 7 PDF Available
Title
Supported sulfonic acids: Metal-free catalysts for the oxidation of hydroquinones to benzoquinones with hydrogen peroxide
Abstract

Some silica- and polystyrene-supported sulfonic acids, prepared by tethering or sol–gel techniques, were employed as metal-free heterogeneous catalysts in the oxidation of hydroquinones to the corresponding 1,4-benzoquinones, carried out with 30% aqueous hydrogen peroxide. The activity of these catalysts was tested in the model oxidation of methylhydroquinone under batch conditions: high yield and selectivity at room temperature and under environmentally friendly conditions can be achieved in the presence of SiO2–(CH2)3–SO3H. The heterogeneous catalyst, that can be easily recovered by simply filtration, can be used for at least three cycles affording the same good results (∼80% yield, ∼91% selectivity).

Graphical abstractFigure optionsDownload full-size imageDownload high-quality image (60 K)Download as PowerPoint slideHighlights► Sulfonic acid supported on both amorphous and mesoporous siliceous materials. ► Physico-chemical characterization of the supported catalysts. ► Test of these catalysts in the oxidation of hydroquinones to benzoquinones. ► Good yields and excellent selectivities with SiO2–(CH2)3–SO3H.

Keywords
Oxidation; Hydrogen peroxide; Hydroquinones; Benzoquinones; Supported sulfonic acids
First Page Preview
Supported sulfonic acids: Metal-free catalysts for the oxidation of hydroquinones to benzoquinones with hydrogen peroxide
Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis A: General - Volumes 411–412, 16 January 2012, Pages 146–152
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Catalysis