Abstract
Using multi-component catalysts offers the possibility to optimize the individual reaction steps. In the last decades, great attention has been focused on bimetallic systems, representing the next step from monometallic catalysts to multi-component ones. However, this approach requires detailed knowledge of both the influence of individual components and their mutual cooperation. In the study of these factors it is advantageous to use ultra-high vacuum conditions where well-defined-metal surfaces, so-called model catalysts, can be prepared and characterized by modern surface-science techniques. The Pd/Nb model catalysts were prepared by depositing a small amount of palladium on polycrystalline niobium substrates. The film growth was investigated via variations of intensity ratio of excited Pd and Nb plasmons. It has been found that Pd-Nb interface was formed by a continuous Pd layer growing on Nb substrate.
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