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Issue 29, 2011
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Surface structure and reactivity of Pd(100) during CO oxidation near ambient pressures

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Abstract

The surface structure of Pd(100) during CO oxidation was measured using a combination of a flow reactor and in situ surface X-ray diffraction coupled to a large-area 2-dimensional detector. The surface structure was measured for PO2/PCO ratios between 0.6 and 10 at a fixed total gas pressure of 200 mbar and a fixed CO pressure of 10 ± 1 mbar. In conjunction with the surface structure the reactivity of the surface was also determined. For all PO2/PCO ratios the surface was found to oxidize above a certain temperature. Three different types of oxides were observed: the Image ID:c1cp20989b-t1.gif surface oxide, an epitaxial layer of bulk-like PdO, and a non-epitaxial layer of bulk-like PdO. As soon as an oxide was present the reactivity of the surface was found to be mass transfer limited by the flux of CO molecules reaching the surface.

Graphical abstract: Surface structure and reactivity of Pd(100) during CO oxidation near ambient pressures

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Publication details

The article was received on 31 Mar 2011, accepted on 25 May 2011 and first published on 16 Jun 2011


Article type: Communication
DOI: 10.1039/C1CP20989B
Citation: Phys. Chem. Chem. Phys., 2011,13, 13167-13171
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    Surface structure and reactivity of Pd(100) during CO oxidation near ambient pressures

    R. van Rijn, O. Balmes, A. Resta, D. Wermeille, R. Westerström, J. Gustafson, R. Felici, E. Lundgren and J. W. M. Frenken, Phys. Chem. Chem. Phys., 2011, 13, 13167
    DOI: 10.1039/C1CP20989B

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