Silver/Palladium alloys are used in heterogeneous catalysis as a means of improving reaction selectivity. Palladium deposited on Ag (1 1 1) is used as a model to understand rearrangement of the material in the presence of reactive gases. Thermodynamically, Pd is a more stable in the subsurface region; leading to silver-capped palladium islands after heating to 450 K. The Palladium migrates to the surface upon exposure to CO or O<sub>2</sub> at room temperature. A combination of ambient pressure X-Ray photoelectron spectroscopy, scanning tunneling microscopy, and density functional theory were used to understand the dynamic behavior of these materials. Selected examples of reactivity that illustrate the bifunctionality of the material will be presented.

Rearrangement of bimetallic alloys: understanding through surface science models

2019 Spring National Meeting

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