Catalytic reactions of hydrocarbons over Pt-Pd alloys. II. Deuterium exchange of methane and ethane over Pt-Pd alloy films. Surface composition of Pt-Pd alloy system

László Guczi, Zbigniew Karpiński

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Abstract

The exchange of deuterium with methane is proposed as a diagnostic tool to estimate the surface composition of Pt-Pd alloy films. Only stepwise exchange has been found on Pt, Pd, and Pt-Pd alloys. From the kinetic parameters (EA and log A) obtained on thick and thin films the surface composition of thick films is predicted. The occurrence of a well-defined compensation effect suggests that the total activity may be calculated from the contributions from platinum and palladium individual active centers, supporting the idea of using deuterium-methane exchange for solving the problem of surface composition. It seems that although the surface of Pt-Pd alloy is in fact enriched with Pd, this occurs to a lesser extent than is foreseen by the theory of alloy segregation. This conclusion finds support in the analysis of one Pt-Pd alloy by Auger electron spectroscopy. The results of a study of C2H6D2 exchange are also reported.

Original languageEnglish
Pages (from-to)438-444
Number of pages7
JournalJournal of Catalysis
Volume56
Issue number3
DOIs
Publication statusPublished - Mar 15 1979

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ASJC Scopus subject areas

  • Catalysis
  • Physical and Theoretical Chemistry

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