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Modulating the Structure and Reactivity of Pt–Ni Catalysts

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Construction and Reactivity of Pt-Based Bi-component Catalytic Systems

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Abstract

We show that the cycling oxidative and reductive treatments at variable temperatures can reversibly alternate the surface structure and reactivity of Pt–Ni bicomponent catalysts. Low-temperature (~423 K) oxidation of Pt-skin structure (Pt/Ni/Pt(111)) induces part of Ni diffuse outward and form NiO on surface. After further oxidation at a higher temperature of 623 K, the catalysts are completely encapsulated by NiO. When the Pt@NiO core–shell structure is reduced at low temperature (~423 K), part of Ni starts to diffuse inward. Upon the reduction at a high temperature of 623 K, the formation of Pt-skin surface is observed. The catalysts pretreated at low temperatures show high CO oxidation reactivity due to the formation of the sandwich-like structure with surface and subsurface Ni species.

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Authors and Affiliations

  1. Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian, Liaoning, China

    Rentao Mu

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Correspondence to Rentao Mu .

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Mu, R. (2017). Modulating the Structure and Reactivity of Pt–Ni Catalysts. In: Construction and Reactivity of Pt-Based Bi-component Catalytic Systems. Springer Theses. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-662-55244-5_4

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