Catalysis Letters

, Volume 22, Issue 3, pp 197–203 | Cite as

Sizeable deactivation effect for the 1,3-butadiene hydrogenation on vapor-deposited Pd aggregates on graphite

  • C. Noupa
  • J. -L. Rousset
  • B. Tardy
  • J. -C. Bertolini
Article

Abstract

The catalytic activity of Pd aggregates vapor-deposited on graphite has been measured in the 1,3-butadiene hydrogenation. It is generally decreasing with particle size. But, such a decrease is largely depending upon the hydrogen and the hydrocarbon pressure. Indeed, with low hydrocarbon pressure (about 1 Torr) and in presence of large excess of hydrogen (Ph2/Pc4h6=100) the activity of the smaller aggregates is comparable to that of larger particles. The different behaviour is consequently attributed to a size dependent deactivation. Such a deactivation could be due to carbon deposits generated by dehydrogenation of the diene admolecules. This behaviour is tentatively related with marked differences observed by XPS on the smaller aggregates, both with respect to the core level energies and to the density of states into the valence band.

Keywords

Deactivation supported Pd vapor-deposited aggregates 1,3-butadiene hydrogenation reaction XPS binding energy 

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Copyright information

© J.C. Baltzer AG, Science Publishers 1993

Authors and Affiliations

  • C. Noupa
    • 1
  • J. -L. Rousset
    • 1
  • B. Tardy
    • 1
  • J. -C. Bertolini
    • 1
  1. 1.Institut de Recherches sur la CatalyseCNRSVilleurbanne CedexFrance

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