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Abstract

Strong metal-support interactions (SMSI) are regarded to be responsible for the change in selectivity and activity of group 8 metal catalysts supported on transition metal oxides. To investigate the nature of interaction between the catalyst components, model systems for Rh/TiO(2) catalysts were prepared with a metal loading of the order of one monolayer on top of several hundred angstroms of TiO(2). The samples showed a sufficiently high electrical conductivity to be examined by low-energy ion scattering spectroscopy (ISS) and sputtering as well as by additional surface physical techniques. The model catalysts were annealed at several temperatures up to 823 K and depth profiles of the first atomic layers were measured after every step. The rhodium layer is encapsulated by an oxide layer at a substrate temperature of about 750 K, regardless of the presence or absence of hydrogen. The encapsulation cannot be reversed by an oxidation-reduction cycle.

Additional information

Authors: LINSMEIER C, Max-Planck-Institut für Plasmaphysik, Garching bei München (DE);TAGLAUER E, Max-Planck-Institut für Plasmaphysik, Garching bei München (DE);KNÖZINGER H, Universität München, Institut für Physikalische Chemie (DE);KNOZINGER H, Universitat Munchen, Institut fur Physikalische Chemie (DE)
Bibliographic Reference: Article: Nuclear Instruments and Methods in Physics Research B, Vol. 118 (1996), pp. 533-540
Record Number: 199611504 / Last updated on: 1997-01-16
Category: PUBLICATION
Original language: en
Available languages: en