Palladium particles growth on various aluminas

  • P. Légaré
  • F. Finck
  • R. Roche
  • G. Maire

Abstract

Pd was deposited from a filament onto an α-Al2O3 single-crystal. The Pd 3dP 5/2 binding energy change versus deposition time was used as a calibration of the Pd clusters size. The experiment was then reproduced on γ — Al2O3. The Pd 3d 5/2 binding energy showed that the clusters growth mechanism was now different. Thermal treatments produced a dispersion of the metal or a clusters size increase depending on the temperature or the nature of the support. Oxygen exposure dispersed Pd in every case. A mechanism is proposed to interpret this phenomenon.

PACS

79.60 

Preview

Unable to display preview. Download preview PDF.

Unable to display preview. Download preview PDF.

References

  1. 1.
    Bond, G.C.: Metal support and metal additive effects in Catalysis. Stud. Surface Sci. Catal., Imelik, B et al. (eds.) Vol. 11. Amsterdam, New York: Elsevier 1982.Google Scholar
  2. 2.
    Fuentes, S., Vàsquez, A., Pérez, J.G., Yacaman, M.J.: J. Catal. 99, 492 (1986).CrossRefGoogle Scholar
  3. 3.
    Dexpert, A., Freund, E., Lesage, E., Lynch, J.P.: Metal support and metal additive effects in catalysis. Stud. Surface Sci. Imelik, B. et al. (eds.), Vol. 11. Amsterdam, New York: Elsevier 1982.Google Scholar
  4. 4.
    Beck, D.D., Carr, C.J.: J. Catal. 110, 285 (1988).CrossRefGoogle Scholar
  5. 5.
    Mason, M.G.: Phys. Rev. B 27, 748 (1983).ADSGoogle Scholar
  6. 6.
    Dicenzo, S.B., Wertheim, G.K.: Comm. Solid State Phys. 11, 203 (1985).Google Scholar
  7. 7.
    Kohiki, S.: Appl. Surf. Sci. 25, 81 (1986).ADSCrossRefGoogle Scholar
  8. 8.
    Wertheim, G.K., DiCenzo, S.B.: Phys. Rev. B 37, 844 (1988).ADSCrossRefGoogle Scholar
  9. 9.
    Bagus, P.S., Nelin, C.J.: Z. Phys. D — Atoms, Molecules and Clusters 12 (1989) (this issue).Google Scholar
  10. 10.
    Hilaire, L., Diaz Guerrero, G., Légaré, P., Make, G., Krill, G.: Surf. Sci. 146, 569 (1984).ADSCrossRefGoogle Scholar
  11. 11.
    Wertheim, G.K., Dicenzo, S.B.: Phys. Rev. B 33, 5384 (1986).ADSCrossRefGoogle Scholar
  12. 12.
    Castellani, N.J., Leroy, D.B.: Phys. Stat. Solidi B 148, 121 (1988).ADSCrossRefGoogle Scholar
  13. 13.
    Fritsch, A., Légaré, P.: Surf. Sci. 162, 742 (1985).ADSCrossRefGoogle Scholar
  14. 14.
    Lee, C, Schmidt, L.D.: J. Catal. 101, 123 (1986).CrossRefGoogle Scholar
  15. 15.
    Nandi, R.K., Georgopoulos, P., Cohen, J.B., Butt, J.B., Burwell, R.L.: J. Catal. 77, 421 (1982).CrossRefGoogle Scholar
  16. 16.
    Légaré, P., Finck, F., Roche, R., Maire, G.: Surf. Sci (in press).Google Scholar

Copyright information

© Springer-Verlag 1989

Authors and Affiliations

  • P. Légaré
    • 1
  • F. Finck
    • 1
  • R. Roche
    • 2
  • G. Maire
    • 1
  1. 1.Laboratoire de Catalyse et Chimie des surfacesUniversité Louis PasteurStrasbourg CedexFrance
  2. 2.P. S. A. Etudes et RecherchesLa GarenneFrance

Personalised recommendations