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Metal–support interactions on rhodium model catalysts

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Abstract

Metal–support interactions on supported rhodium catalysts were studied by using specially prepared Rh/TiO2/Mo model systems. For their characterization and the analysis of modifications due to various heat treatments several surface analytical methods were applied: low-energy ion scattering, X-ray photoemission spectroscopy and thermal desorption spectroscopy. Heating in ultrahigh vacuum to 670 K leads to Rh agglomeration followed (above 720 K) by encapsulation including the formation of reduced titanium oxide species. These morphological and chemisorption changes are reversible upon reoxidation and low-temperature reduction and thus exhibit the characteristic features of “strong metal–support interactions”. For the effective mechanism a reaction is suggested that involves oxygen chemisorption on the Rh clusters and partial reduction of the surrounding support oxide.

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Authors and Affiliations

  1. Max-Planck-Institut für Plasmaphysik, EURATOM Association, D-85748, Garching bei München, Germany

    Stefan Labich, Edmund Taglauer & Helmut Knözinger

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  1. Stefan Labich
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  2. Edmund Taglauer
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  3. Helmut Knözinger
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Labich, S., Taglauer, E. & Knözinger, H. Metal–support interactions on rhodium model catalysts. Topics in Catalysis 14, 153–161 (2000). https://doi.org/10.1023/A:1009027621119

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