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CeO2 catalytic activity for soot oxidation under NO/O2 in loose and tight contact

Paper ID Volume ID Publish Year Pages File Format Full-Text
55363 47049 2012 5 PDF Available
Title
CeO2 catalytic activity for soot oxidation under NO/O2 in loose and tight contact
Abstract

The catalytic activity of CeO2 for soot oxidation under NO/O2 in loose and tight contact was investigated. Reactivity tests were carried out in a fixed bed reactor set in a vertical electrical furnace and connected to specific gas analyzers for NO, NO2, CO and CO2.Kinetic parameters, such as activation energy and frequency factor, corresponding to the oxidation of soot in catalyzed or non-catalyzed tests were determined by multivariate non-linear regression. The selected method is based on contracting sphere model. The obtained kinetic parameters are in agreement with the mechanism proposed in the literature for soot oxidation assisted or not by NOx. Obtained values confirmed the effect of the catalyst–soot contact on the CeO2 activity.

Graphical abstractFigure optionsDownload full-size imageDownload high-quality image (109 K)Download as PowerPoint slideHighlights► Soot combustion with CeO2 catalyst was investigated in loose and tight contact mixtures under O2 and NO/O2. ► Soot oxidation rate depends on the tightness of the contact between CeO2 and carbon particles. ► The maximum temperature (Tmax) of soot oxidation rate is reduced by 160–180 °C in tight contact. ► Kinetic parameters such as activation energy Ea were determined by multivariate-non linear regression. ► Activation energy of the non-catalytic soot oxidation in the presence of O2 is 135 kJ mol−1. The presence of CeO2 lowers the activation energy by 60–90 kJ mol−1.

Keywords
Catalytic soot oxidation; Ceria; NOx; Oxidation kinetics; Activation energy
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CeO2 catalytic activity for soot oxidation under NO/O2 in loose and tight contact
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Publisher
Database: Elsevier - ScienceDirect
Journal: Catalysis Today - Volume 189, Issue 1, 30 July 2012, Pages 65–69
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