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Redox properties of titanium oxides on Pt3Ti
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1995 (English)In: Journal of Physical Chemistry, ISSN 0022-3654, Vol. 99, no 34, p. 12892-12895Article in journal (Refereed) Published
Abstract [en]

The morphology and electronic structure of surface-segregated titanium oxides on Pt3Ti(111) are presented. Core level photoemission spectra at grazing emission reveal two states of oxidation: a dominant and reducible four-valent oxide together with a small amount of a three-valent oxide is produced by oxidation in 0 2 at and below 400°C; an irreducible three-valent oxide by oxidation in 02 at and above 450 °C. The ratio between the active four-valent and the inactive three-valent oxides decreases with increasing oxidation temperature. The probability for reduction by CO is almost unity for the Ti 4+ oxide, and the conclusion must be that the four-valent oxide plays an active role for catalytic reactions. Scanning tunneling measurements relate these observations to changes in the dispersion and nucleation of the oxide overlayer. The four-valent oxide grows as islands with remaining areas open for CO adsorption while the three-valent oxide spreads on and blocks the crystal surface. Photoemission spectra relate these dispersion effects to an electronic interaction between the Ti 3+ oxide and adjacent Pt atoms. The above observations are in accordance with the common picture of dispersion effects in titania-supported SMSI catalysts and prove that interfacial energies play a crucial role whether the dominant phase is metallic or an oxide.

Place, publisher, year, edition, pages
1995. Vol. 99, no 34, p. 12892-12895
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URN: urn:nbn:se:ltu:diva-6929DOI: 10.1021/j100034a030Local ID: 5428add0-3889-11dd-8721-000ea68e967bOAI: oai:DiVA.org:ltu-6929DiVA, id: diva2:979815
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Upprättat; 1995; 20080612 (ysko)Available from: 2016-09-29 Created: 2016-09-29 Last updated: 2017-11-24Bibliographically approved

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Paul, Jan

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