Abstract
Pt-Ir alloys were prepared by evaporating the specpure metals onto a quartz substrate and equilibration at 700 K. The Auger signal intensity of a monolayer of the elements was determined for the relevant peaks. The results are evaluated by means of the Gallon equation. The theoretical surface composition is calculated for the ideal solution model and compared with the experimental resultd. A pronounced surface enrichment in Pt is observed, in agreement with the theoretical predictions. Experiments with propane adsorption have been performed and a possible explanation of the results is offered. Results obtained are found to correspond well with literature data on catalytic reactions.
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