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

L. Burkholder, D. Stacchiola and W. T. Tysoe ()
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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

Surface Review and Letters (SRL), 2003, vol. 10, issue 06, 909-916

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.

Keywords: Infrared absorption spectroscopy; thermal desorption spectroscopy; chemisorption; palladium; alkenes; hydrogen (search for similar items in EconPapers)
Date: 2003
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DOI: 10.1142/S0218625X03005712

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