Skip to main content
SpringerLink
Log in

Microstructure of a Pd/ceria–zirconia catalyst after high-temperature aging

  • Published:
Catalysis Letters Aims and scope Submit manuscript

Abstract

A model automotive exhaust catalyst, consisting of 2.25 wt% Pd supported on initially high-surface-area (88 m2/g) cerium–zirconium mixed oxide (Ce0.5Zr0.5O2), was studied by X-ray diffraction (XRD), thermogravimetric analysis (TGA), and transmission electron microscopy (TEM), following high-temperature (1150°C) redox aging. Spherical Pd particles with size varying from 30 to 80 nm in diameter were found to be embedded both within single grains and at interfaces between multiple grains of the mixed oxide. X-ray energy-dispersive spectroscopy (EDS) and microbeam electron diffraction show that these particles are pure Pd, with face-centeredcubic structure. These results, together with elemental distribution maps obtained by EDS imaging, provide detailed visualization of an encapsulation phenomenon previously reported on the basis of XRD and TGA measurements alone.

This is a preview of subscription content, log in via an institution to check access.

Access this article

Log in via an institution

Price excludes VAT (USA)
Tax calculation will be finalised during checkout.

Instant access to the full article PDF.

Institutional subscriptions

Similar content being viewed by others

References

  1. J.-P. Cuif, S. Deutsch, M. Marczi, H.-W. Jen, G.W. Graham, W. Chun and R.W. McCabe, Society of Automotive Engineers Paper No. 980668 (1998).

  2. G.W. Graham, H.-W. Jen, W. Chun and R.W. McCabe, Catal. Lett. 44 (1997) 185.

    Article  CAS  Google Scholar 

  3. A.W. Hull, Science 52 (1920) 227.

    CAS  Google Scholar 

  4. G.R. Levi and C. Fontana, Gazz. Chim. Ital. 56 (1926) 388.

    CAS  Google Scholar 

  5. P. Wynblatt, R.A. Dalla Betta and N.A. Gjostein, in: The Physical Basis of Heterogeneous Catalysis, eds. E. Drauglis and R.I. Jaffee (Plenum Press, New York, 1975) p. 501.

    Google Scholar 

  6. P.R. Powell and S.E. Whittington, J. Catal. 81 (1983) 382.

    Article  CAS  Google Scholar 

  7. H. Haberlandt, in: Theoretical Aspects of Heterogeneous Catalysis, ed. J.B. Moffat (Van Nostrand Reinhold, New York, 1990) chapter 8, p. 311, and references therein.

    Google Scholar 

Download references

Author information

Authors and Affiliations

  1. Department of Materials Science and Engineering, The University of Michigan, Ann Arbor, MI, 48109, USA E-mail:

    J.C. Jiang & X.Q. Pan

  2. Chemical and Physical Sciences Laboratory, Ford Motor Company, MD3179/SRL, PO Box 2053, Dearborn, MI, 48121, USA

    G.W. Graham & R.W. McCabe

  3. Department of Chemical Engineering, The University of Michigan, Ann Arbor, MI, 48109, USA

    J. Schwank

Authors
  1. J.C. Jiang
    View author publications

    You can also search for this author in PubMed Google Scholar

  2. X.Q. Pan
    View author publications

    You can also search for this author in PubMed Google Scholar

  3. G.W. Graham
    View author publications

    You can also search for this author in PubMed Google Scholar

  4. R.W. McCabe
    View author publications

    You can also search for this author in PubMed Google Scholar

  5. J. Schwank
    View author publications

    You can also search for this author in PubMed Google Scholar

Rights and permissions

Reprints and permissions

About this article

Cite this article

Jiang, J., Pan, X., Graham, G. et al. Microstructure of a Pd/ceria–zirconia catalyst after high-temperature aging. Catalysis Letters 53, 37–42 (1998). https://doi.org/10.1023/A:1019089318822

Download citation

  • Issue Date:

  • DOI: https://doi.org/10.1023/A:1019089318822

Search

Navigation