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Surface modification of platinum with copper and by plasma-chemical treatment and the effect on H-Pt bond energy

  • I. G. Bratchikova
  • N. A. Galimova
  • N. N. Lobanov
  • V. D. Yagodovskii
Physicochemical Processes at the Interfaces

Abstract

Kinetics of H2 desorption from the surface of a platinum catalyst applied to silica gel, as well as from the surface of the same catalyst modified with a copper additive, is studied. Desorption of hydrogen was studied both before and after the treatment of the catalyst in the electric glow discharge of argon or oxygen or in the high-frequency H2 plasma. The H-Pt bond energy was found to increase upon the introduction of copper additive and decrease upon the plasma-chemical treatment of copper-platinum specimens. In the latter case, the size of metal particles increases and the microstrain in them decreases. The observed changes in H-Pt bond energy are explained by the change in the electronic state of the surface and the increase in the number of metal structure defects.

Keywords

Bond Energy Platinum Catalyst Tran Sition State Theory Chloroplatinic Acid Desorp Tion 
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References

  1. 1.
    Galimova, N.A., Pskhu, Z.V., Naumkin, A.V., Volkov, I.O., et al., Zh. Fiz. Khim., 2010, vol. 84, no. 11.Google Scholar
  2. 2.
    Yagodovskii, V.D. and Rei, S.K., Zh. Fiz. Khim., 1982, vol. 56, no. 9, p. 2358.Google Scholar
  3. 3.
    Pskhu, Z.V. and Yagodovskii, V.D., Fizikokhim. Poverkhn. Zashch. Mater., 2011, vol. 47, no. 3, p. 237. (Prot. Met. Phys. Chem. Surf. (Eng.Transl.) 2011. vol.47, no.3, p.291).Google Scholar
  4. 4.
    Yagodovskaya, T.V. and Lunin, V.V., Zh. Fiz. Khim., 1997, vol. 71, no. 5, p. 775.Google Scholar
  5. 5.
    Galimova, N.A., Naumkin, A.V., Volkov, I.O., et al., Zh. Fiz. Khim., 2009, vol. 83, no. 10, p. 1.Google Scholar
  6. 6.
    Wedler, G., Chemisorption. An Experimental Approach, London: Butterworths, 1976, p. 249.Google Scholar
  7. 7.
    Yagodovskii, V.D., Pskhu, Z.V., Yagodovskaya, T.V., et al., Zh. Fiz. Khim., 2005, vol. 79, no. 2, p. 308.Google Scholar
  8. 8.
    Thomas, J.M. and Thomas, W.J., Principles and Practice of Heterogeneous Catalysis, New York: Wiley, 1996.Google Scholar
  9. 9.
    Thompson, P., Cox, D.E., and Hastings, J.B., J. Appl. Crystallogr., 1987, vol. 20, p. 79.CrossRefGoogle Scholar
  10. 10.
    Williamson, G.K. and Hall, W.H., Acta Metall., 1953, vol. 1, p. 22.CrossRefGoogle Scholar
  11. 11.
    Handbook of Chemistry and Physics, Hogman, C.D. and Holmes, H.N., Eds., Cleveland: Chemical Rubber, vol. 2, p. 2345.Google Scholar

Copyright information

© Pleiades Publishing, Ltd. 2012

Authors and Affiliations

  • I. G. Bratchikova
    • 1
  • N. A. Galimova
    • 1
  • N. N. Lobanov
    • 1
  • V. D. Yagodovskii
    • 1
  1. 1.People’s Friendship University of RussiaMoscowRussia

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