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Attempts at an in situ Raman study of ceria/zirconia catalysts in PM combustion

Paper ID Volume ID Publish Year Pages File Format Full-Text
46776 46448 2011 6 PDF Available
Title
Attempts at an in situ Raman study of ceria/zirconia catalysts in PM combustion
Abstract

CexZr1−xO2 catalysts with various Ce/Zr contents were studied using Raman spectroscopy under different gaseous atmospheres, at different temperatures and in the presence of a model soot. Catalysts with high concentrations of Zr fluoresced at elevated temperatures making analysis of their spectra impossible. This effect became even more pronounced at higher temperatures. CeO2 and solid solutions with relatively low concentrations of Zr showed a red shift and a decrease in intensity of the characteristic F2g peak at high temperatures under different atmospheres. The magnitude of the latter effect was higher under reducing atmospheres. These changes are reversible upon cooling, showing that they relate to a lattice expansion effect rather than any major chemical change to the material. In the presence of the model soot the Raman spectra of all materials was much decreased due to the absorption of the incident and scattered radiation by the soot particles. The presence of soot does not change the relative intensities or positions of the peaks in the spectra of the solid solutions. Evidence is shown for the production of a Ce3+–CO species following interaction between the soot and the surface at high temperature in an inert atmosphere.

Graphical abstractFigure optionsDownload full-size imageDownload as PowerPoint slideHighlights► CexZr1−xO2 samples fluoresce at high temperatures when probed using Raman spectroscopy. ► F2g/T2g peak reversibly moves to lower energy at high temperature. ► PM decreases intensity of Raman bands. ► High temperature treatment of Ce0.8Zr0.2O2/PM in He forms a Ce3+–CO adduct.

Keywords
CexZr1−xO2; PM combustion; In situ Raman spectroscopy
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Attempts at an in situ Raman study of ceria/zirconia catalysts in PM combustion
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis B: Environmental - Volumes 108–109, 11 October 2011, Pages 134–139
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