Abstract
Overlayers of TiO x on Rh foil have been grown by Ti evaporation in vacuo followed by oxidation in 100 Torr of O 2 at 420 K. Auger electron spectra taken as a function of Ti dosing show a two-dimensional growth of TiO x until completion of one monolayer; thereafter, growth is three-dimensional. The decrease in CO chemisorption capacity of the foil is substantially greater than that expected for physical blockage of adsorption sites by TiO x . This behavior is enhanced by H 2 reduction at 770 K. Temperature-programmed desorption of CO shows a weakening in the strength of CO adsorption on Rh for TiO x coverages exceeding 0.5 ML. The data can be interpreted in terms of a model in which CO chemisorption is inhibited at Rh sites adjacent to TiO x species in addition to the Rh sites covered by TiO x .
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