Support and metal particle size effects on platinum and rhodium model catalysts

TL;DRAbstract

Research focused on the study of support and particle-size effects on the properties of Rh and Pt catalysts. Model catalysts were prepared by evaporation of Rh and Pt onto a series of flat non-porous supports in order to model catalytic properties and simplify the interpretation of experiments. Adsorption properties were studied for Rh on ZrO$\\sb2$(100), Rh on CeO$\\sb2$, Pt on both the Zn- and the O- polar surfaces of ZnO(0001), and Pt on CeO$\\sb2$. Temperature programmed desorption was used to measure the adsorption properties of the catalysts, and catalyst structure was determined for some samples by transmission electron microscopy. In addition, catalytic activities were measured for CO oxidation on Pt/$\\alpha$-Al$\\sb2$O$\\sb3$(0001), Rh/$\\alpha$-Al$\\sb2$O$\\sb3$(0001), and Rh/CeO$\\sb2$ and for NO reduction by CO on Rh/$\\alpha$-Al$\\sb2$O$\\sb3$(0001). Adsorption measurements successfully predicted the particle-size dependence for CO oxidation on Pt/$\\alpha$-Al$\\sb2$O$\\s

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