Abstract
The chemisorption of ethylene and benzene has been investigated on Pt 78 Ni 22 and Pt 50Ni 50(111) single crystal alloys by vibrational electron energy loss spectroscopy and thermal desorption spectroscopy. These alloys exhibit a strong platinum segregation leading to a quasicomplete platinum layer on the surface. On Pt 78Ni 22(111), the hydrocarbonated surface complexes formed after C 2H 4 and c 6h 6 adsorption show the same main features as these recorded on Pt(111). However, evidence for more weak interactions with the metal surface is obtained. On Pt 50Ni 50(111), no C 2H 4 and c 6h 6 adsorption has been obtained, even at 180 K. These results evidence the specific behaviour of the superficial layers of quasi-pure platinum supported on the bulk alloys with respect to pure platinum: a decrease of chemisorption strengths is observed after alloying, which is much more pronounced on the Pt 50Ni 50 sample.
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