Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
5424922 | Surface Science | 2007 | 6 Pages |
Abstract
A well-defined CeOx/Pt(1Â 1Â 1) model catalytic system has been fabricated using the self-assembling of Ce adatoms on a Pt(1Â 1Â 1) surface with a subsequent oxidation of the nucleating Ce submonolayer (0.3Â ML). The resulting system of the “inverse supported catalyst” type consists of CeOx nanoformations (2D islands of 5-15Â nm size and â¼0.3Â nm in height) more or less uniformly distributed over the Pt(1Â 1Â 1) surface. This CeOx/Pt(1Â 1Â 1) system has been tested in the CO oxidation reaction where both the CO2 production rate and the Ce oxidation state were monitored in situ. An enhanced reactivity and a remarkable shift of the bistable region of the reaction towards higher CO pressures were observed when compared to a clean Pt(1Â 1Â 1) surface. The CeOx islands exhibit a pronounced redox behaviour that follows the hysteresis cycle of the reaction. The usefulness of such a type of the “inverse model catalyst” for studying the oxygen diffusion supply and the redox behaviour of ceria in the ceria-platinum catalysts is demonstrated.
Keywords
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Physical Sciences and Engineering
Chemistry
Physical and Theoretical Chemistry
Authors
Y. Suchorski, R. Wrobel, S. Becker, B. Strzelczyk, W. Drachsel, H. Weiss,