Effect of metal-support interaction on surface segregation in Pd-Pt nanoparticles

In this work. we present the results of our Monte Carlo (MC) simulation stu dies for the segregation behavior of supported, clean and gas-covered Pd-Pt nanoparticles as a function of the metal-support interaction. For preferen tial Pd-support interaction, the base of the nanoparticle is found to get e nriched with Pd atoms; while for preferential interaction of Pt atoms with the support the base gets enriched in Pt. The composition of the rest of th e particle changes slightly with the metalsupport interaction. The presence of oxygen and hydrogen atoms does not influence the role of the metal-supp ort interaction on the surface composition of Pd-Pt nanoparticles. The simu lation results are found to be in total agreement with the known experiment al results. (C) 2001 Elsevier Science B.V. All rights reserved.