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In situ observation of platinum sintering on ceria-based oxide for autoexhaust catalysts using Turbo-XAS

Paper ID Volume ID Publish Year Pages File Format Full-Text
55732 47063 2011 8 PDF Available
Title
In situ observation of platinum sintering on ceria-based oxide for autoexhaust catalysts using Turbo-XAS
Abstract

Using a time resolved X-ray absorption spectroscopy (XAS) technique, we studied an in situ dynamic observation of sintering for Pt particles supported on a ceria-based oxide and Al2O3 supports under cyclic oxidizing/reducing conditions at 800 °C. The effect of the support oxide and the amount of Pt loading on the Pt sintering was investigated. The sintering of Pt particles in 2 wt% Pt/ceria-based oxide could be inhibited, when compared to in 2 wt% Pt/Al2O3. Moreover, 0.5 wt% Pt and 1 wt% Pt/ceria-based oxide with a lower Pt loading brought higher stability of Pt against sintering. For a 0.5 wt% Pt/ceria-based oxide catalyst, sintering was completely inhibited and highly dispersed Pt particles (particle size; 1.5 nm) were maintained under redox cycling at 800 °C. These results lead to the conclusion that Pt–O–Ce bond formation on the surface of a ceria-based oxide under oxidative conditions in redox cycling inhibits the sintering of Pt particles, and that the Pt–O–Ce anchor site (its strength and number) has an important role in the sintering inhibition of Pt particles on ceria-based oxide. In addition, we note and discuss apparent change in the oxygen storage/release performance of ceria-based oxide from the viewpoint of the Pt particle size and the intrinsic bulk behavior of ceria-based oxide.

Graphical abstractFigure optionsDownload full-size imageDownload high-quality image (323 K)Download as PowerPoint slideHighlights► Sintering of Pt nano-particle could be inhibited by the Pt–O–Ce “anchor” sites. ► Pt/ceria with a lower Pt loading brought higher stability against Pt sintering. ► For a 0.5 wt% Pt/ceria-based catalyst, sintering was completely inhibited.

Keywords
Platinum; Sintering; XAFS; Automotive catalyst; Ceria–zirconia; Oxygen storage capacity
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In situ observation of platinum sintering on ceria-based oxide for autoexhaust catalysts using Turbo-XAS
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Publisher
Database: Elsevier - ScienceDirect
Journal: Catalysis Today - Volume 175, Issue 1, 25 October 2011, Pages 133–140
Authors
, , , , , , , , , , , ,
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