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

L. 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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Ethane
Deuterium
Methane
Hydrocarbons
Surface structure
ethane
deuterium
methane
hydrocarbons
Thick films
thick films
Palladium
Auger electron spectroscopy
Platinum
Kinetic parameters
Auger spectroscopy
electron spectroscopy
palladium
platinum
occurrences

ASJC Scopus subject areas

  • Catalysis
  • Process Chemistry and Technology

Cite this

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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.",
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AU - Karpiński, Zbigniew

PY - 1979/3/15

Y1 - 1979/3/15

N2 - 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.

AB - 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.

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