We studied CO oxidation on FeO(1 1 1) films on Pt(1 1 1) at submonolayer oxide coverages at ultrahigh vacuum and near-atmospheric pressure conditions. The FeO(1 1 1) bilayer islands are inert towards CO<inf>2</inf> formation. In contrast, the FeO<inf>2-x</inf> trilayer structure shows substantial CO<inf>2</inf> production that reaches a maximum at ≈40 % coverage at both pressure conditions. The results provide compelling evidence that the FeO<inf>2-x</inf>/Pt(1 1 1) interface is the most active in CO oxidation. Although FeO<inf>2-x</inf> boundaries possesses weakly bound oxygen species, strong binding of CO to Pt favors the reaction at the FeO<inf>2-x</inf>/Pt interface as compared to the FeO<inf>2-x</inf>/FeO one, thus giving a rationale to the reactivity enhancement observed in systems exposing metal/oxide boundaries. In addition, oxygen diffusion from the interior of an FeO<inf>2-x</inf> island to the active edge sites may be effective for the oxygen replenishment in the CO oxidation catalytic cycle.

Pan, Q., Weng, X., Chen, M., Giordano, L., Pacchioni, G., Noguera, C., et al. (2015). Enhanced CO Oxidation on the Oxide/Metal Interface: From Ultra-High Vacuum to Near-Atmospheric Pressures. CHEMCATCHEM, 7(17), 2620-2627 [10.1002/cctc.201500394].

Enhanced CO Oxidation on the Oxide/Metal Interface: From Ultra-High Vacuum to Near-Atmospheric Pressures

GIORDANO, LIVIA;PACCHIONI, GIANFRANCO;
2015

Abstract

We studied CO oxidation on FeO(1 1 1) films on Pt(1 1 1) at submonolayer oxide coverages at ultrahigh vacuum and near-atmospheric pressure conditions. The FeO(1 1 1) bilayer islands are inert towards CO2 formation. In contrast, the FeO2-x trilayer structure shows substantial CO2 production that reaches a maximum at ≈40 % coverage at both pressure conditions. The results provide compelling evidence that the FeO2-x/Pt(1 1 1) interface is the most active in CO oxidation. Although FeO2-x boundaries possesses weakly bound oxygen species, strong binding of CO to Pt favors the reaction at the FeO2-x/Pt interface as compared to the FeO2-x/FeO one, thus giving a rationale to the reactivity enhancement observed in systems exposing metal/oxide boundaries. In addition, oxygen diffusion from the interior of an FeO2-x island to the active edge sites may be effective for the oxygen replenishment in the CO oxidation catalytic cycle.
Articolo in rivista - Articolo scientifico
interfaces; iron; monolayer; oxidation; platinum; Inorganic Chemistry; Organic Chemistry; Physical and Theoretical Chemistry; Catalysis
English
2015
7
17
2620
2627
none
Pan, Q., Weng, X., Chen, M., Giordano, L., Pacchioni, G., Noguera, C., et al. (2015). Enhanced CO Oxidation on the Oxide/Metal Interface: From Ultra-High Vacuum to Near-Atmospheric Pressures. CHEMCATCHEM, 7(17), 2620-2627 [10.1002/cctc.201500394].
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/10281/111281
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