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Encapsulation, particle chemical enhancers

The FeO(lll) film is, indeed, extremely stable and chemically inert under conditions typically used in UHV-based experiments. However, the situation changes dramatically in the mbar range of pressures. At low temperatures studied here (400 450 K), Pt(lll) is inactive in CO oxidation due to the well-known blocking effect of CO on O2 dissociation. The nanometer-thick FesO lll) films shows some activity, but it is negligible as compared to ultrathin FeO(lll) films, which showed an order of magnitude higher reaction rate under the same conditions (Figure 4.4.7A). Therefore, it is the thin FeO overlayer on Pt that is responsible for the enhanced reactivity of encapsulated Pt particles in CO oxidation. [Pg.342]

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See also in sourсe #XX -- [ Pg.277 ]



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