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Catalysis Letters

, Volume 116, Issue 1–2, pp 1–8 | Cite as

Effect of alloy composition on dispersion stability and catalytic activity for NO oxidation over alumina-supported Pt–Pd catalysts

  • G. W. Graham
  • H.-W. Jen
  • O. Ezekoye
  • R. J. Kudla
  • W. Chun
  • X. Q. Pan
  • R. W. McCabeEmail author
Article

Abstract

Applying a synthesis procedure that promotes alloy formation, highly-dispersed alumina-supported Pt–Pd catalysts spanning the Pt-rich half of the composition range were prepared, aged under oxygen-rich hydrothermal conditions, and characterized by CO chemisorption, XRD, and TEM. Anomalously large particles, typical of pure Pt catalysts treated under such conditions, were not found in any of the Pd-containing catalysts, and the extent of particle coarsening due to aging was found to decrease with increasing Pd content. Alloying appears to have little effect on the NO oxidation turn-over frequency, which increases with decreasing dispersion.

Keywords

Pt Pd alloy particle coarsening NO oxidation 

Notes

Acknowledgments

The authors gratefully acknowledge the support of C. T. Goralski, Jr. during the early stages of this work, useful discussions with P. J. Schmitz, A. R. Drews, and S. J. Harris on the subject of NO oxidation, and technical assistance from J. Hangas. The JEOL 3011 TEM resides at EMAL, a facility of the University of Michigan, which is funded in part under NSF Grant DMR-9871177.

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Copyright information

© Springer Science+Business Media, LLC 2007

Authors and Affiliations

  • G. W. Graham
    • 1
  • H.-W. Jen
    • 1
  • O. Ezekoye
    • 2
  • R. J. Kudla
    • 1
  • W. Chun
    • 1
  • X. Q. Pan
    • 2
  • R. W. McCabe
    • 1
    Email author
  1. 1.Chemical Engineering DepartmentFord Motor CompanyDearbornUSA
  2. 2.Department of Material Science & EngineeringUniversity of MichiganAnn ArborUSA

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