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The Pr promotion effect on oxygen storage capacity of Ce–Pr oxides studied using a TAP reactor

Paper ID Volume ID Publish Year Pages File Format Full-Text
44103 46003 2007 7 PDF Available
Title
The Pr promotion effect on oxygen storage capacity of Ce–Pr oxides studied using a TAP reactor
Abstract

The oxygen storage capacity including OSC, OSCC and dynamic OSC was measured for Ce–Pr oxides using a temporal analysis of products (TAP) reactor system. The exact features of reduction and re-oxidation were obtained by accurately measuring the uptake of CO and O, and the production of CO2. It was found that the reduction temperature of Ce–Pr oxides was lowered 50–100 °C in comparison to that of CeO2. The substitution of cerium by praseodymium in the Ce1−xPrxO2−δ oxides enhanced both OSC and OSCC. However, OSCC was much influenced by the increase of praseodymium content more than OSC. It was interpreted that the addition of Pr significantly increased the amount of oxygen migrating from bulk to surface while the migration rate of bulk oxygen was slightly accelerated. On the basis of analyses of the Ce 3d, Pr 3d and O 1s X-ray photoelectron spectra, the promotion effect of Pr on oxygen storage capacity could be attributed to the Ce4+/Ce3+, Pr4+/Pr3+ redox behaviour and the enrichment of oxygen vacancies in Ce1−xPrxO2−δ.

Graphical abstractDescription: The oxygen storage capacity of Ce–Pr oxides which was measured using a temporal analysis of products (TAP) reactor system was significantly enhanced by the substitution of cerium by praseodymium. The promotion effect of Pr could be attributed to the Ce4+/Ce3+, Pr4+/Pr3+ redox behaviour and the enrichment of oxygen vacancies in Ce1−xPrxO2−δ.Figure optionsDownload full-size imageDownload as PowerPoint slide

Keywords
Oxygen storage capacity; Ce–Pr oxides; TWC; TAP
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The Pr promotion effect on oxygen storage capacity of Ce–Pr oxides studied using a TAP reactor
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis A: General - Volume 329, 1 October 2007, Pages 86–92
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
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Any Questions? feel free to contact us