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Redox properties of titanium oxides on Pt3Ti
KTH, Tidigare Institutioner, Fysik.
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1995 (Engelska)Ingår i: Journal of Physical Chemistry, ISSN 00223654 (ISSN), Vol. 99, nr 34, s. 12892-12895Artikel i tidskrift (Refereegranskat) 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 O2 at and below 400°C; an irreducible three-valent oxide by oxidation in O2 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 Ti4+ 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 Ti3+ 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. © 1995 American Chemical Society.

Ort, förlag, år, upplaga, sidor
1995. Vol. 99, nr 34, s. 12892-12895
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URN: urn:nbn:se:kth:diva-83031OAI: oai:DiVA.org:kth-83031DiVA, id: diva2:502767
Anmärkning
Correspondence Address: Paul, J.; KTH/Royal Institute of Technology, Physics III, 100 44 Stockholm, Sweden NR 20140805Tillgänglig från: 2012-02-14 Skapad: 2012-02-12 Senast uppdaterad: 2012-02-14Bibliografiskt granskad

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