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Topics in Catalysis
Published in: Topics in Catalysis 1-2/2012

01-03-2012 | Original Paper

The Contribution of Alumina Phase Transformations to the Sintering of Pd Automotive Catalysts

Authors: Qing Xu, Karl C. Kharas, Brandon J. Croley, Abhaya K. Datye

Published in: Topics in Catalysis | Issue 1-2/2012

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Abstract

High temperature aging of supported Pd/alumina causes a phase transformation of the transitional (γ, θ or δ) alumina support into alpha (α) alumina. This phase transformation is accompanied by a loss in surface area. This raises the question: how much is the drop in Pd dispersion caused by support sintering? We answer this question by a comparison of chemically similar Pd/alumina catalysts that differ only in one aspect, their physical treatment. The physical treatment is the milling of the support which is often used during wash coating of monolithic automotive catalysts. We show that milling of transitional alumina supports can accelerate their phase transformation into alpha alumina. By comparing catalysts that were milled with those that were not milled, we conclude that the sintering of the catalyst support does not contribute significantly to the sintering of the metal phase. Our results apply specifically to isothermal aging of the catalysts at 900 °C in 10% H2O in N2 for periods of up to 200 h.
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Metadata
Title
The Contribution of Alumina Phase Transformations to the Sintering of Pd Automotive Catalysts
Authors
Qing Xu
Karl C. Kharas
Brandon J. Croley
Abhaya K. Datye
Publication date
01-03-2012
Publisher
Springer US
Published in
Topics in Catalysis / Issue 1-2/2012
Print ISSN: 1022-5528
Electronic ISSN: 1572-9028
DOI
https://doi.org/10.1007/s11244-012-9770-x

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