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Dechlorination of tetrachloro-o-benzoquinone by ozonation catalyzed by cesium loaded metal oxides

Paper ID Volume ID Publish Year Pages File Format Full-Text
46218 46435 2013 12 PDF Available
Title
Dechlorination of tetrachloro-o-benzoquinone by ozonation catalyzed by cesium loaded metal oxides
Abstract

Ozone initiated oxidation of tetrachloro-o-benzoquinone (3,4,5,6-Tetrachlorocyclohexa-3,5-diene-1,2-dione, TCCD) in aqueous system catalyzed by different loadings of cesium oxide supported on metal oxides namely; Al2O3, SiO2 and TiO2 was investigated. Catalyst materials were characterized using different surface techniques including Raman, FT-IR, BET, SEM, TEM, ICP, TPD and XRD. XRD showed that cesium is in three different phases on the surface of the catalysts; and SEM and SEM-EDX indicated that cesium is well dispersed on the surface of the supports. Catalyst testing was done employing varying ozone molar ratios from 1 to 3 in the oxygen stream in a semi-batch reactor. 2,3-Dichloro-4,5-dioxohex-2-enedioic acid (DCA) was an intermediate and 2,3-dioxosuccinic acid (DSA) and oxalic acid (OA) were the main oxidation by-products. The oxidation products were characterized and confirmed by IR, 1H NMR and Mass spectral data. The product distribution was dependent on the acidity of the supports. Among all the catalysts while 5% Cs/TiO2 showed good activity, 1% Cs/SiO2 showed relatively poor catalytic activity.

Graphical abstractFigure optionsDownload full-size imageDownload as PowerPoint slideHighlights► Complete dechlorination of tetrachloro-o-benzoquinone (TCCD) is achieved. ► Complete mineralization of possible. ► % Conversion of TCCD and product selectivity depends on ozone ratio and ozonation duration.

Keywords
3,4,5,6-Tetrachlorocyclohexa-3,5-diene-1,2-dione; Ozone; Cesium Oxide loaded; Alumina; Silica; Titania; 2,3-Dioxosuccinic acid; Oxalic acid
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Dechlorination of tetrachloro-o-benzoquinone by ozonation catalyzed by cesium loaded metal oxides
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis B: Environmental - Volumes 138–139, 17 July 2013, Pages 149–160
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