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Effect of Ce and La on the structure and activity of MnOx catalyst in catalytic combustion of chlorobenzene

Paper ID Volume ID Publish Year Pages File Format Full-Text
46458 46440 2012 9 PDF Available
Title
Effect of Ce and La on the structure and activity of MnOx catalyst in catalytic combustion of chlorobenzene
Abstract

Mn-based oxide-mixed catalysts modified with Ce and La, which were prepared by complexation method, were tested in the catalytic combustion of chlorobenzene (CB) as a model of chlorinated aromatics. The characterization by XRD, XPS, TPR and Raman shows that the addition of Ce makes a large portion of Mn species enter CeO2 fluorite, leading to the formation of MnCeOx solid solution. The structure to be composed of MnOx and MnCeOx solid solution is highly active for CB oxidation due to the presence of a large amount of active oxygen species. The addition of La can promote the thermal stability of MnCeOx solid solution during calcination up to 750 °C, and accordingly the catalyst presents high activity. The study on reaction kinetics shows zero order on CB concentration in the presence of the catalysts except for MnCe-550, indicating that adsorption strength of Cl species produced during the reaction is critical to CB combustion because the adsorbed Cl species can decrease the reducibility of Mn species, thus the mobility of oxygen. Nevertheless, high activity, good selectivity and desired stability were observed over MnCeLa catalysts at 350 °C.

Graphical abstract.Figure optionsDownload full-size imageDownload as PowerPoint slideHighlights► The interface between MnOx and MnCeOx is highly active for CB combustion. ► The addition of La can promote the thermal stability of MnCeOx solid solution. ► The active oxygen enhances the removal of Cl species adsorbed on Mn-based catalysts.

Keywords
Chlorobenzene; Catalytic combustion; Cl adsorption; Thermal stability; MnCeOx solid solution
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Effect of Ce and La on the structure and activity of MnOx catalyst in catalytic combustion of chlorobenzene
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis B: Environmental - Volumes 111–112, 12 January 2012, Pages 141–149
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
Online Support
Any Questions? feel free to contact us