Advertisement

Kinetic modeling of the CO oxidation reaction on supported metal clusters

  • L. Piccolo
  • C. Becker
  • C. R. Henry
Conference paper

Abstract

The CO oxidation on Pd is generally considered to be structure insensitive and is not expected to depend on the size of the Pd particles. However, several size effects have already been evidenced for this reaction. Near the temperature where the steady-state reaction rate is maximum, the reactivity per Pd surface atom (turnover number (TON)) increases for small particles. At low temperature, in transient molecular beam experiments, a second peak of CO2 appears after the CO beam is closed, while the oxygen is still supplied to the sample. This peak shifts, and its shape changes with temperature and oxygen pressure. This peak is explained by the presence of CO strongly bound to the particle edges. This strongly bound CO reacts well after the CO adsorbed on the facets has desorbed. A kinetic model is presented which explains the evolution of this peak with temperature and oxygen pressure.

PACS

61.46.+w Clusters nanoparticles nanocrystalline materials -82.65.Jv Heterogeneous catalysis 

Preview

Unable to display preview. Download preview PDF.

Unable to display preview. Download preview PDF.

References

  1. 1.
    S. Ladas, H. Poppa, M. Boudart: Surf. Sci. 102, 151 (1981) 15.Google Scholar
  2. 2.
    V. Matolin, E. Gillet: Surf, Sci. 166 ; L115 (1986)Google Scholar
  3. 3.
    V. Matolin, E. Gillet, N. Kruse: Surf. Sci. 186, L541 16. (1987) 17.Google Scholar
  4. 4.
    F. Rumpf, H. Poppa, M. Boudart: Langmuir 4, 722 (1988) 18.Google Scholar
  5. 5.
    C.R. Henry: Surf. Sci. 223, 519 (1989)ADSCrossRefGoogle Scholar
  6. 6.
    X. Xu, D.W. Goodman. J Phys. Chem. 97, 7711 (1993) 19.Google Scholar
  7. 7.
    M. Eriksson, L.G. Petersson: Surf. Sci. 311, 139 (1994)ADSCrossRefGoogle Scholar
  8. 8.
    I. Stara, V. Nehasil, V. Matolin: Surf. Sci. 331–333, 173 20. (1995) 21.Google Scholar
  9. 9.
    C. Becker, C.R. Henry: Surf. Sci. 352–354, 457 (1996)ADSCrossRefGoogle Scholar
  10. 10.
    I. Stara, V. Nehasil, V. Matolin: Surf. Sci. 365, 69 (1996) 22.Google Scholar
  11. 11.
    C. Becker, C.R. Henry: Catal. Lett. 43, 55 (1997)CrossRefGoogle Scholar
  12. 12.
    T. Engel, G. Ertl: Adv. Catal. 28, 1 (1979)CrossRefGoogle Scholar
  13. 13.
    G. Ertl: in Catalysis Science and Technology, ed. by J.R. An derson, M. Boudart, Vol. 4 ( Springer, Berlin 1983 ) p. 209Google Scholar
  14. 14.
    H. Uetsuka, K. Watanabe, H. Ohnuma, K. Kunimori: Surf. Rev. Lett. 4, 1359 (1997)CrossRefGoogle Scholar
  15. 15.
    K. Watanabe, H. Ohnuma, H. Kimpara, H. Uetsuka, K. Kunimori: Surf. Sci. 402–404, 100 (1998)CrossRefGoogle Scholar
  16. 16.
    M. Boudart: Adv. Catal, 20, 1 (1969)CrossRefGoogle Scholar
  17. 17.
    C.R. Henry: Surf. Sci. Rep. 31, 231 (1998)ADSCrossRefGoogle Scholar
  18. 18.
    C. Duriez, C.R. Henry, C. Chapon: Surf. Sci. 253, 190 (1991)ADSCrossRefGoogle Scholar
  19. 19.
    C.R. Henry, C. Chapon, C. Duriez, S. Giorgio: Surf. Sci. 253, 177 (1991)ADSCrossRefGoogle Scholar
  20. 20.
    H.P. Bonze!, R. Ku: Surf. Sci. 33, 91 (1972)ADSCrossRefGoogle Scholar
  21. 21.
    C.R. Henry, C. Chapon, C. Goyhenex, R. Monot: Surf. Sci. 272, 283 (1992)ADSCrossRefGoogle Scholar
  22. 22.
    See, for example, R. Stumpf, M. Scheffier: Phys. Rev. Lett. 72, 254 (1994); T. Fu, Y. Tzeng, TT. Tsong: Surf. Sci. 366, L691 (1996); G. Hoogers, B. Lesiak-Orlowska, D.A. King: Surf. Sci. 327, 47 (1995)Google Scholar

Copyright information

© Springer-Verlag Italia 1999

Authors and Affiliations

  • L. Piccolo
    • 1
  • C. Becker
    • 1
  • C. R. Henry
    • 1
  1. 1.CRMC2-CNRScampus de LuminyMarseille Cedex 09France

Personalised recommendations