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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 photoemmission 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.

Additional information

Authors: LABISH S, Max-Plank-Institut fur Plasmaphysik,EURATOM-Association, Boltzmannstrasse 2, D-85748 Garching (DE);TAGLAUER E, Max-Plank-Institut fur Plasmaphysik,EURATOM-Association, Boltzmannstrasse 2, D-85748 Garching (DE);KNOZINGER H, Institut fur Physikalische Chemie, Universitat Munchen, Butenandtstrasse 5-13, D-81377 Munchen (DE)
Bibliographic Reference: Article: Topics in Catalysis, Vol 40 (2001), No. 1-4, pp. 153-161
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