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Volume 162, 2013
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CO and O overlayers on Pd nanocrystals supported on TiO2(110)

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Abstract

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. Near edge X-ray absorption fine structure (NEXAFS) measurements at 300 K reveal 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 × 2)-O formed on the (111) top facet of the Pd nanocrystals at 190 K.

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Publication details

The article was received on 30 Nov 2012, accepted on 17 Dec 2012 and first published on 18 Dec 2012


Article type: Paper
DOI: 10.1039/C2FD20137B
Citation: Faraday Discuss., 2013,162, 191-200
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    CO and O overlayers on Pd nanocrystals supported on TiO2(110)

    C. M. Yim, C. L. Pang, D. S. Humphrey, C. A. Muryn, K. Schulte, R. Pérez and G. Thornton, Faraday Discuss., 2013, 162, 191
    DOI: 10.1039/C2FD20137B

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