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We have prepared a model catalytic system by depositing Pd onto a TiO2(110) surface held at ~720 K. Scanning tunneling microscopy (STM) reveals well-defined Pd nanocrystals consisting of 111 top facets with 111 and 100 side facets. The Pd nanocrystals go down to about 10 nm in width and 1.3 nm in height. Top facets can be imaged with atomic resolution, indicating the absence of TiOx encapsulation. The model catalyst was probed by exposure to CO and O2. By varying the CO exposure, different CO overlayers were formed on the 111 top facets, with coverages ranging from 0.33 to 0.75 of a monolayer. NEXAFS at 300 K reveals that at around 0.5 ML coverage, CO is oriented with the molecular axis more or less normal to TiO2(110). Dosing small amounts of O2 separately on a Pd/TiO2(110) surface led to an overlayer of p(2[times]2)-O formed on the 111 top-facet of the Pd nanocrystals at 190 K.
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