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