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Influence Of Surface Structure On The Mechanism Of Co Adsorption And Catalytic Oxidation On Palladium

Author

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  • I. STARÁ

    (Department of Electronics and Vacuum Physics, Faculty of Mathematics and Physics, Charles University, V Holešovičkách 2, 180 00 Prague 8, Czech Republic)

  • V. MATOLÍN

    (Department of Electronics and Vacuum Physics, Faculty of Mathematics and Physics, Charles University, V Holešovičkách 2, 180 00 Prague 8, Czech Republic)

Abstract

The adsorption and oxidation of carbon monoxide on small alumina-supported Pd particles have been studied by temperature-programmed desorption (TPD) using molecular beam techniques. The results of size effect studies show clearly different surface properties of bulk metal and supported clusters. Surprising effect of particalCOdissociation was observed on small Pd particles deposited on γ-alumina, prepared by thermal oxidation of aluminum, and not on Pd/α-alumina model catalysts. The activation energy ofCOdesorption,Ed, was determined as a function of particle size. TheEddecreased with decreasing particle size. The CO and oxygen sticking probability measurements indicated theCOand oxygen diffusion over the support. It was shown that the oxygen adsorption capacity and the reactivity of alumina-supported catalysts were higher than those of Pd(111).

Suggested Citation

  • I. Stará & V. Matolín, 1997. "Influence Of Surface Structure On The Mechanism Of Co Adsorption And Catalytic Oxidation On Palladium," Surface Review and Letters (SRL), World Scientific Publishing Co. Pte. Ltd., vol. 4(06), pages 1353-1358.
    • Handle: RePEc:wsi:srlxxx:v:04:y:1997:i:06:n:s0218625x97001802
    DOI: 10.1142/S0218625X97001802
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