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Enhancement of OSC property of Zr rich ceria–zirconia by loading a small amount of platinum

Paper ID Volume ID Publish Year Pages File Format Full-Text
54473 47010 2014 6 PDF Available
Title
Enhancement of OSC property of Zr rich ceria–zirconia by loading a small amount of platinum
Abstract

•Zirconium rich ceria–zirconia was prepared by the coprecipitation method, and Pt/CZ catalysts were prepared by the impregnation method.•The property of oxygen release and storage of Pt/CZ catalysts was enhanced by a small amount of Pt and one redox cycle.•The catalytic activities of CO oxidation reaction were also improved by Pt loadings.•It was concluded that OSC properties were strongly correlated with the catalytic performance of Pt/CZ catalysts.

The OSC properties and catalytic activities of Pt/ceria–zirconia catalysts with a small amount of platinum and cerium were investigated so as to reduce the usage of rare metals. In the case of Pt/CZ catalysts calcined at 800 °C, the nano-sized platinum particles highly dispersed on the surface of CZ support. The platinum particles sintered via the calcination at 1000 °C, whereas the mean diameters of Pt particles in Pt/CZ with small Pt loadings were maintained in nano-scale size. The enhancement of oxygen release properties due to Pt loadings was confirmed through H2-TPR measurements. On the other hand, the activities for CO oxidation were also improved by the loading of dispersed platinum particles. Moreover, the temperature of total CO oxidation was correlated with the oxygen release temperature. It was suggested that the release of lattice oxygen in ceria–zirconia support should be indispensable for CO oxidation reaction. This study revealed the effectivity of a small amount of Pt loadings and Zr rich CZ support.

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Keywords
Platinum catalyst; Ceria–zirconia; Oxygen-storage capacity (OSC); CO oxidation
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Publisher
Database: Elsevier - ScienceDirect
Journal: Catalysis Today - Volume 232, 1 September 2014, Pages 179–184
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