Yolk-Shell Gold Nanoparticles as Model Materials for Support-Effect Studies in Heterogeneous Catalysis: Au, @C and Au, @ZrO2 for CO Oxidation as an Example

Authors

  • Carolina Galeano,

    1. Department of Heterogeneous Catalysis, Max-Planck Institut für Kohlenforschung, Kaiser-Wilhelm-Platz 1, 45470 Mülheim an der Ruhr (Germany), Fax: (+49) 208-306-2995
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  • Dr. Robert Güttel,

    1. Department of Heterogeneous Catalysis, Max-Planck Institut für Kohlenforschung, Kaiser-Wilhelm-Platz 1, 45470 Mülheim an der Ruhr (Germany), Fax: (+49) 208-306-2995
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  • Dr. Michael Paul,

    1. Department of Heterogeneous Catalysis, Max-Planck Institut für Kohlenforschung, Kaiser-Wilhelm-Platz 1, 45470 Mülheim an der Ruhr (Germany), Fax: (+49) 208-306-2995
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  • Dr. Pablo Arnal,

    1. Centro de Tecnología de Recursos Minerales y Cerámica (CETMIC), Cno. Centenario y 506, C.C.49 (B 1897 ZCA), M. B. Gonnet. Pcia. de Buenos Aires (Argentina)
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  • Prof. An-Hui Lu,

    1. State Key Laboratory of Fine Chemicals, School of Chemical Engineering, Dalian University of Technology, 116024 Dalian (P.R. China)
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  • Prof. Ferdi Schüth

    Corresponding author
    1. Department of Heterogeneous Catalysis, Max-Planck Institut für Kohlenforschung, Kaiser-Wilhelm-Platz 1, 45470 Mülheim an der Ruhr (Germany), Fax: (+49) 208-306-2995
    • Department of Heterogeneous Catalysis, Max-Planck Institut für Kohlenforschung, Kaiser-Wilhelm-Platz 1, 45470 Mülheim an der Ruhr (Germany), Fax: (+49) 208-306-2995
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Abstract

The use of nanostructured yolk-shell materials offers a way to discriminate support and particle-size effects for mechanistic studies in heterogeneous catalysis. Herein, gold yolk-shell materials have been synthesized and used as model catalysts for the investigation of support effects in CO oxidation. Carbon has been selected as catalytically inert support to study the intrinsic activity of the gold nanoparticles, and for comparison, zirconia has been used as oxidic support. Au, @C materials have been synthesized through nanocasting using two different nonporous-core@mesoporous-shell exotemplates: Au@SiO2@ZrO2 and Au@SiO2@m-SiO2. The catalytic activity of Au, @C with a gold core of about 14 nm has been evaluated and compared with Au, @ZrO2 of the same gold core size. The strong positive effect of metal oxide as support material on the activity of gold has been proved. Additionally, size effects were investigated using carbon as support to determine only the contribution of the nanoparticle size on the catalytic activity of gold. Therefore, Au, @C with a gold core of about 7 nm was studied showing a less pronounced positive effect on the activity than the metal oxide support effect.

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