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

Abstract 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.