Structure, composition and thermal properties of cerium oxide films on platinum {111}

The oxidation of Ce films on Pt(111) by O 2 and N 2O and the thermal properties of the resulting oxide layers have been studied by a combination of LEED, Δф measurements, XP and Auger spectroscopy. Reaction with N 2O results in the formation of {0001}-oriented Ce 2O 3, whereas O 2 generates {111}-or...

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Bibliographic Details
Published in:Surface science 1995-03, Vol.326 (1), p.1-10
Main Authors: Hardacre, Christopher, Roe, Gerard M., Lambert, Richard M.
Format: Article
Language:English
Subjects:
Catalysis
Catalytic reactions
Cerium
Chemistry
Exact sciences and technology
General and physical chemistry
Nitrogen oxides
Oxidation
Oxygen
Platinum
Solid-gas interface
Surface physical chemistry
Theory of reactions, general kinetics. Catalysis. Nomenclature, chemical documentation, computer chemistry
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Summary:The oxidation of Ce films on Pt(111) by O 2 and N 2O and the thermal properties of the resulting oxide layers have been studied by a combination of LEED, Δф measurements, XP and Auger spectroscopy. Reaction with N 2O results in the formation of {0001}-oriented Ce 2O 3, whereas O 2 generates {111}-oriented defective CeO 2 containing about 20% Ce 3+. Annealing results in partial reduction of these oxide layers and at ∼ 1100 K a Pt Ce surface alloy is formed, characterised by the appearance of (2 × 2) and (2 × 2)R30° structures. The implications of these findings for the catalytic behaviour of Pt ceria systems is discussed.
ISSN:0039-6028
1879-2758
DOI:10.1016/0039-6028(94)00783-7