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KINETIC AND REACTIVE PROPERTIES OF ETHYLENE ON CLEAN AND HYDROGEN-COVERED Pd(111)

Author

Listed:
  • L. BURKHOLDER

    (Department of Chemistry and Laboratory for Surface Studies, University of Wisconsin–Milwaukee, Milwaukee, WI 53211, USA)

  • D. STACCHIOLA

    (Department of Chemistry and Laboratory for Surface Studies, University of Wisconsin–Milwaukee, Milwaukee, WI 53211, USA)

  • W. T. TYSOE

    (Department of Chemistry and Laboratory for Surface Studies, University of Wisconsin–Milwaukee, Milwaukee, WI 53211, USA)

Abstract

Several molecular adsorption states are identified following ethylene adsorption on clean and hydrogen-covered Pd(111) using temperature-programmed desorption (TPD) and reflection absorption infrared spectroscopy (RAIRS). Di-σ-bonded ethylene forms on clean Pd(111) desorbing with an activation energy of 80 kJ/mol at low coverages. The strong intermolecular lateral interactions considerably reduce the desorption temperature at higher coverages. Π-bonded ethylene is formed on hydrogen-covered Pd(111), where the proportion of π-bonded species increases with hydrogen coverage. This species converts to the more stable di-σ-bonded species on heating. Ethane formation is detected in TPD from hydrogen-precovered Pd(111), which is predominantly formed by reaction with π-bonded ethylene.

Suggested Citation

  • L. Burkholder & D. Stacchiola & W. T. Tysoe, 2003. "KINETIC AND REACTIVE PROPERTIES OF ETHYLENE ON CLEAN AND HYDROGEN-COVERED Pd(111)," Surface Review and Letters (SRL), World Scientific Publishing Co. Pte. Ltd., vol. 10(06), pages 909-916.
    • Handle: RePEc:wsi:srlxxx:v:10:y:2003:i:06:n:s0218625x03005712
    DOI: 10.1142/S0218625X03005712
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