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Catalytic oxidation of toluene over binary mixtures of copper, manganese and cerium oxides supported on γ-Al2O3

Paper ID Volume ID Publish Year Pages File Format Full-Text
46851 46451 2011 12 PDF Available
Title
Catalytic oxidation of toluene over binary mixtures of copper, manganese and cerium oxides supported on γ-Al2O3
Abstract

The catalytic oxidation of toluene has been investigated over binary mixtures of copper, manganese and cerium oxides supported on high surface area γ-Al2O3 in comparison with the corresponding single metal oxide components. Catalysts were synthesized with the impregnation method and were characterized with respect to their specific surface area (BET method), phase composition and mean crystallite size (XRD technique), reducibility (H2-TPR) and adsorption/desorption characteristics toward toluene (TPD followed by TPO). Results obtained using a feed composition consisting of 1000 ppm toluene in air showed that the catalytic performance of mixed oxide catalysts can be improved significantly by proper selection of metal oxide (MxOy) loading and composition. The intrinsic activity of optimized catalysts, measured under differential reaction conditions, was found to be significantly higher compared to that of their single-component counterparts. This has been attributed to the better dispersion of the active MxOy phases, their increased reducibility (reactivity of surface oxygen), and their lower tendency to form coke deposits under reaction conditions. Addition of a second VOC (propane) or water vapor in the feed affected differently the activity of optimized-mixed oxide catalysts. As a general trend, inhibition by the presence of propane was more pronounced for CeO2-containing samples whereas the presence of H2O affected mainly the CuOx-containing catalysts. It is concluded that the VOC oxidation activity of Al2O3-supported mixed oxide catalysts is determined by the reducibility of the dispersed active phases, which may be controlled by proper selection of MxOy nature, loading and composition.

Graphical abstractFigure optionsDownload full-size imageDownload as PowerPoint slideResearch highlights► Combustion activity of mixed oxide catalysts depends on MxOy type, loading and composition. ► Activity of optimized catalysts is higher than that of single-component counterparts. ► Enhancement of activity is due to the increased reducibility of active MxOy phases.

Keywords
Toluene; VOC; Metal oxide; Manganese oxide; Copper oxide; Cerium oxide; Total oxidation; TPR; TPD; TPO
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Catalytic oxidation of toluene over binary mixtures of copper, manganese and cerium oxides supported on γ-Al2O3
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis B: Environmental - Volume 103, Issues 3–4, 5 April 2011, Pages 275–286
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