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A molecular beam investigation of the catalytic oxidation of CO on Pd (111)

J. Chem. Phys. 69, 1267 (1978); doi:10.1063/1.436666

Issue Date: 1 August 1978

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T. Engel and G. Ertl
Institut für Physikalische Chemie, Universität München, Sophienstr. 11, D-8000 München 2, West Germany
A detailed investigation of the steady-state and nonsteady-state reaction CO+1/2O2-->CO2 on Pd (111) has been carried out with the molecular beam technique. It could be shown conclusively that the reaction proceeds between two adsorbed species (Langmuir–Hinshelwood mechanism) throughout the temperature and pressure range investigated. For low CO coverages, the activation energy of the reaction was determined to be 25 kcal/mole, whereas at moderate CO coverages, a rearrangement of the oxygen adlayer takes place resulting in a reduction of the activation energy to 14 kcal/mole. It is not possible to formulate a simple kinetic expression for the reaction rate which is valid over the entire range of temperatures and pressures due to changes in the adsorption rate for O2, coadsorption of CO and O2, to diffusion in the adlayer, and to changes in the geometrical arrangement within the adlayer with varying coverage. The Journal of Chemical Physics is copyrighted by The American Institute of Physics.
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PACS

  • 82.65.Jv
    Physical chemistry Surface processes Heterogeneous catalysis at surfaces and other surface reactions
  • 82.40.Dm
    Physical chemistry Chemical kinetics and reactions: special regimes Atomic and molecular beam reactions
  • YEAR: 1978

PUBLICATION DATA

ISSN:
0021-9606 (print)   1089-7690 (online)
Publisher:
AIP is a member of CrossRef AIP

REFERENCES (33)
View in Separate Window/Tab
  1. (a) I. Langmuir, Trans. Faraday Soc. 17, 672 (1922);
    2. (b) H. Heyne and F. C. Tompkins, Proc. R. Soc. London Ser. A 292, 460 (1966);
    (c) I. I. Tretyakov, A. V. Sklyarov, and B. R. Shub, Kinet. Katal. 11, 166 (1970); [ChemPort]
    (d) R. L. Palmer and J. N. Smith, J. Chem. Phys. 60, 1453 (1974); [ISI] [ChemPort]
    (e) G. K. Hori and L. D. Schmidt, J. Catal. 38, 335 (1975); [ChemPort]
    (f) H. P. Bonzel and J. J. Burton, Surf. Sci. 52, 223 (1975);
    (g) C. A. Becker, J. P. Cowin, L. Wharton, and D. J. Auerbach, J. Chem. Phys. 67, 3394 (1977); [ISI] [ChemPort]
    (h) H. P. Bonzel and R. Ku, Surf. Sci. 33, 91 (1972); [Inspec] [ISI] [ChemPort]
    H. Hopster, H. Ibach, and G. Comsa, J. Catal. 46, 37 (1977). [ISI]
  2. (a) N. V. Ageev and N. I. Ionov, Kinet. Katal. 14, 687 (1973); [ChemPort]
    3. (b) K. Christmann and G. Ertl, Z. Naturforsch. Teil A 28, 1144 (1973); [Inspec]
    (c) J. Küppers and A. Plagge, J. Vac. Sci. Techn. 13, 259 (1976);
    (d) V. P. Ivanov, G. K. Boreskov, V. I. Savchenko, W. F. Egelhoff, and W. H. Wienberg, J. Catal. 48, 269 (1977).
  3. T. E. Madey, H. A. Engelhardt, and D. Menzel, Surf. Sci. 48, 304 (1975). [Inspec] [ISI] [ChemPort]
  4. C. T. Campbell and J. M. White (to be published).
  5. G. M. Schwab and K. Gossner, Z. Phys. Chem. N. F. 16, 39 (1958). [ChemPort]
  6. A. G. Daglish and D. D. Eley, Proc. Int. Congr. Catal., 2nd, Paris, 1960 (1961), Vol. 2, p. 1615.
  7. D. G. Tajbl, J. B. Simons, and J. J. Carberry, Ind. Eng. Fundamentals 5, 171 (1966).
  8. R. F. Baddour, M. Modell, and U. K. Heusser, J. Phys. Chem. 72, 3621 (1968).
  9. S. J. Stephens, J. Phys. Chem. 63, 188 (1959). [ChemPort]
  10. E. G. Alexander and W. W. Russell, J. Phys. Chem. 68, 1614 (1964). [ChemPort]
  11. R. L. Park, in Fundamentals of Gas-Surface Interactions, edited by H. Saltsburg, J. N. Smith, and M. Rogers (Academic, New York, 1967), p. 295.
  12. K. Kawasaki, T. Sugita, and S. Ebisawa, J. Chem. Phys. 44, 2313 (1966); [ISI]
    13. Surf. Sci. 8, 485 (1967). [ChemPort]
  13. T. Engel and G. Ertl, Chem. Phys. Lett. (to be published).
  14. G. Ertl and P. Rau, Surf. Sci. 15, 443 (1969). [ChemPort]
  15. G. Ertl and J. Koch, Z. Phys. Chem. N. F. 68, 323 (1970).
  16. G. Ertl and J. Koch, in Adsorption-Desorption Phenomena, edited by F. Ricca (Academic, New York, 1972), p. 345.
  17. G. Ertl and J. Koch, in Proceedings of the Fifth International Congress on Catalysis, edited by J. Hightower (North-Holland, Amsterdam, 1973), p. 969.
  18. G. Ertl and M. Neumann, Z. Phys. Chem. N. F. 90, 127 (1974). [Inspec]
  19. J. S. Close and J. M. White, J. Catal. 36, 185 (1975). [ChemPort]
  20. T. Matsushima and J. M. White, J. Catal. 39, 265 (1975).
  21. T. Matsushima, D. B. Almy, D. C. Foyt, J. S. Close, and J. M. White, J. Catal. 38, 277 (1975).
  22. T. Matsushima and J. M. White, J. Catal. 40, 334 (1975). [ChemPort]
  23. T. Matsushima, C. J. Mussett, and J. M. White, J. Catal. 41, 397 (1976). [ChemPort]
  24. H. Conrad, G. Ertl, and J. Kuppers, Surf. Sci. (to be published).
  25. T. Engel, J. Chem. Phys. (to be published).
  26. H. Conrad, G. Ertl, J. Küppers, and E. E. Latta, Surf. Sci. 65, 245 (1977). [Inspec] [ISI] [ChemPort]
  27. G. Ertl and J. Koch, Z. Naturforsch. Teil A 25, 1906 (1970). [Inspec]
  28. R. H. Jones, D. R. Olander, W. J. Sickhaus, and J. A. Schwarz, J. Vac. Sci. Technol. 9, 1429 (1972). [ISI] [ChemPort]
  29. M. Balooch, M. J. Cardillo, D. R. Miller, and R. E. Stickney, Surf. Sci. 46, 348 (1974);
    30. M. J. Cardillo, M. Balooch, and R. E. Stickney, Surf. Sci. 50, 263 (1975). [Inspec] [ISI] [ChemPort]
  30. G. Comsa, Proc. Int. Conf. Solid Surfaces, 3rd, Vienna, 1977.
  31. C. S. Alexander and J. Pritchard, J. Chem. Soc. Faraday Trans. 68, 202 (1972).
  32. W. van Willigen, Phys. Lett. A 28, 80 (1968). [Inspec] [ChemPort]
  33. G. Ertl, in Ref. 17, p. 978 (discussion remark).

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