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On the effect of reduction and ageing on the TWC activity of Pd/Ce0.68Zr0.32O2 under simulated automotive exhausts

Paper ID Volume ID Publish Year Pages File Format Full-Text
55592 47058 2012 8 PDF Available
Title
On the effect of reduction and ageing on the TWC activity of Pd/Ce0.68Zr0.32O2 under simulated automotive exhausts
Abstract

The activity of a Pd/Ce0.68Zr0.32O2 catalyst was studied under complex gas mixtures simulating those in automotive exhaust gases, analysing the evolution of CO, C3H6, O2 and NO conversion and nitrogen compounds formed. The effects of pre-reduction and ageing treatments in cycled redox feedstreams at 1173 K, where the composition of oxidizing and reducing streams and cooling environment were changed, were investigated. The obtained results are compatible with the presence of two active palladium species on the catalyst surface whose predominance is temperature-dependent: Pd(I)-like species in the low-temperature range, and Pd(0) in the high temperature range.

Graphical abstractFigure optionsDownload full-size imageDownload high-quality image (169 K)Download as PowerPoint slideHighlights► TWC behaviour of Pd/Ce0.68Zr0.32O2 catalysts. ► Effect of pre-reduction and ageing at 1173 K under cycled redox feedstreams. ► Light-off activity is related to the presence of Pd(I)-like and Pd(0) species.

Keywords
TWC; Palladium; Ceria–zirconia; Ageing
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On the effect of reduction and ageing on the TWC activity of Pd/Ce0.68Zr0.32O2 under simulated automotive exhausts
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Publisher
Database: Elsevier - ScienceDirect
Journal: Catalysis Today - Volume 180, Issue 1, 17 January 2012, Pages 88–95
Authors
, , , , ,
Subjects
Physical Sciences and Engineering Chemical Engineering Catalysis
Get Full-Text Now
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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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