SpringerImages - Room temperature STM images (size 200 × 200 nm2) of clean FeO(111)/Pt(111) surface (a), FeO(111)/Pt(111) (b), and Pt(111) (c) surfaces after 120 min in the CO oxidation reaction at 450 K. Tunneling parameters are: bias 0.2 V, current 1 nA (a); 0.8 V, 0.5 nA (b); 0.5 V, 0.3 nA (c)

Room temperature STM images (size 200 × 200 nm2) of clean FeO(111)/Pt(111) surface (a), FeO(111)/Pt(111) (b), and Pt(111) (c) surfaces after 120 min in the CO oxidation reaction at 450 K. Tunneling parameters are: bias 0.2 V, current 1 nA (a); 0.8 V, 0.5 nA (b); 0.5 V, 0.3 nA (c)

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Fig 3

Room temperature STM images (size 200 × 200 nm²) of clean FeO(111)/Pt(111) surface (a), FeO(111)/Pt(111) (b), and Pt(111) (c) surfaces after 120 min in the CO oxidation reaction at 450 K. Tunneling parameters are: bias 0.2 V, current 1 nA (a); 0.8 V, 0.5 nA (b); 0.5 V, 0.3 nA (c)

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Figure 3 shows that the original FeO(111) film with atomically flat, wide terraces transforms into the system represented by small particles randomly distributed on the substrate (cf.

Fig. 3 a, b).

Meanwhile, the Pt(111) surface essentially maintains the crystal morphology after 120 min in the reaction (see Fig. 3 c).

In other words, iron oxide particles formed during the reaction (see Fig. 3 ) practically do not adsorb CO at the reaction temperature (450 K).

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When an Encapsulating Oxide Layer Promotes Reaction on Noble Metals: Dewetting and In situ Formation of an “Inverted” FeOx/Pt Catalyst

by Sun, Ying-Na; Qin, Zhi-Hui; Lewandowski, Mikolaj; Kaya, Sarp; Shaikhutdinov, Shamil; Freund, Hans-Joachim
Journal: Catalysis Letters Vol. 126 Issue 1
DOI: 10.1007/s10562-008-9643-x
Published: 2008-10-28
Institution(s): Fritz-Haber-Institute der Max-Plank-Gesellschaft

Abstract

An ultra-thin FeO(111) film grown on Pt(111) is found to exhibit a much higher rate of CO oxidation at stoichiometric CO:O₂ ratios than the clean Pt(111) surface. This unexpected result is rationalized on the basis of reaction induced dewetting of the oxide film, ultimately resulting in highly dispersed FeO_x nanoparticles on Pt(111). The effect may have a strong impact on the catalytic properties of the noble metal particles encapsulated by the reducible oxide support as a result of strong metal-support interaction.

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	Platinum
	Iron oxides
	Strong metal-support interaction
	CO oxidation
	Surface restructuring
	Selective oxidation

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