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- W2016363553 abstract "Cu deposition on Rh(111) has been investigated and the surface reactivity of the Cu-Rh(111) interface with regard to CO and C2H2 chemisorption examined. Growth of (111) oriented Cu films is shown to take place via a 3D island (Volmer-Weber) growth mechanism, with island coalescence occurring at a total Cu coverage of around 2 monolayers. Two binding states are observed in thermal desorption studies. The more weakly adsorbed state (desorption energy 330 kJ mol−1) is associated with bulk copper while a more strongly adsorbed state (desorption energy 355 kJ mol−1) is observed for Cu in contact with Rh. Alloying of Cu with the underlying Rh takes place slowly at 1000 K. Cu efficiently blocks the strong chemisorption of CO on Rh(111) and a small ligand effect is observed whereby the Rh-CO bond is weakened in the presence of the second metal. Cu has very little effect on the sticking probability of CO, suggesting “spill over” from Cu to Rh takes place in a mobile precursor state. The chemisorption of C2H2 on the bimetallic surface is essentially similar to that observed on the separate metals. Using conventional log θads versus log θCu plots, no pronounced ensemble effects are observed. This is attributed to the presence of attractive interactions within the adlayer which result in the formation of Cu clusters." @default.
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- W2016363553 title "Model studies on bimetallic CuRh catalysts" @default.
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- W2016363553 doi "https://doi.org/10.1016/0039-6028(85)90180-3" @default.
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