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R. Meyer, Sh. K. Shaikhutdinov, H.-J. Freund

CO Oxidation on a Pd/Fe₃O₄(111) Model Catalyst

Adsorption of CO and O₂ on Pd particles deposited on a well-ordered Fe₃O₄(111) film was studied by temperature programmed desorption. Scanning tunneling microscopy was used to provide structural information. The results show that CO adsorbed on Pd particles reacts with oxygen of the oxide support and forms CO₂. The reaction occurs at the particle/oxide interface and exhibits a particle size effect such that the smaller particles produce more CO₂. Oxidation of Pd/Fe₃O₄ alters the oxide structure due to Pd catalyzed oxygen migration into the film and results in formation of an oxygen reservoir, which favors CO oxidation reaction.

Zeitschrift für Physikalische Chemie, Oldenbourg Wissenschaftsverlag

Print ISSN: 0942-9352
Volume: 218, 08/2004
Pages: 905 - 914

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