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Catalysis Letters

, Volume 17, Issue 1–2, pp 21–28 | Cite as

Surface chemistry and catalysis studies on the palladium-boron system in the semihydrogenation of alkynes

  • M. Krawczyk
  • J. Sobczak
  • W. Palczewska
Article

Abstract

A new, supported Pd-B/SiO2 catalyst characterized by its high bond- and stereo-selectivity in semihydrogenation of -C≡C- triple bond is reported. To elucidate its mode of action a model system, Pd(111)-B, was exposed to H2, C2H2 or C2H4 and then investigated by means of AES-LEED-TDS methods. We conclude that there is a geometric blockage of Pd active surface sites by boron adspecies, that their total number diminishes and that the distribution of particular surface ensembles changes.

Keywords

Pd-B modified catalysts alkynes semihydrogenation selectivity Pd(111)-B surface reactivity AES TDS hydrogen sorption ethyne adspecies 

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Copyright information

© J.C. Baltzer AG, Science Publishers 1993

Authors and Affiliations

  • M. Krawczyk
    • 1
  • J. Sobczak
    • 1
  • W. Palczewska
    • 1
  1. 1.Department of Catalysis on MetalsInstitute of Physical Chemistry of the Polish Academy of SciencesWarsawPoland

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