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CO oxidation on metal-supported monolayer oxide films: Do we know which phase (interface) is active?

MPG-Autoren
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Zhang,  Ke
Chemical Physics, Fritz Haber Institute, Max Planck Society;

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Li,  Linfei
Chemical Physics, Fritz Haber Institute, Max Planck Society;

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Shaikhutdinov,  Shamil K.
Chemical Physics, Fritz Haber Institute, Max Planck Society;

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Freund,  Hans-Joachim
Chemical Physics, Fritz Haber Institute, Max Planck Society;

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Zitation

Zhang, K., Li, L., Shaikhutdinov, S. K., & Freund, H.-J. (2018). CO oxidation on metal-supported monolayer oxide films: Do we know which phase (interface) is active? Angewandte Chemie, 130(5), 1275-1279. doi:10.1002/ange.201710934.


Zitierlink: http://hdl.handle.net/11858/00-001M-0000-002E-9768-E
Zusammenfassung
Ultrathin (“monolayer”) films of transition metal oxides grown on metal substrates have recently received considerable attention as promising catalytic materials, in particular for low-temperature CO oxidation. The reaction rate on such systems often increases when the film only partially covers the support, and the effect is commonly attributed to the formation of active sites at the metal/oxide boundary. By studying the structure and reactivity of FeO(111) films on Pt(111), here we show that, independently of the film coverage, CO oxidation takes place at the interface between reduced and oxidized phases in the oxide film formed under reaction conditions. The promotional role of a metal support is to ease formation of the reduced phase via reaction between CO adsorbed on metal and oxygen at the oxide island edge.