1 Ocak 2011 Dergi makalesi Açık Erişim

Emmez, Emre; Vovk, Evgeny I.; Bukhtiyarov, Valerii I.; Ozensoy, Emrah

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        "affiliation": "Bilkent Univ, Dept Chem, TR-06800 Ankara, Turkey", 
        "name": "Emmez, Emre"
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      {
        "name": "Vovk, Evgeny I."
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      {
        "affiliation": "Boreskov Inst Catalysis, Novosibirsk 630090, Russia", 
        "name": "Bukhtiyarov, Valerii I."
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        "affiliation": "Bilkent Univ, Dept Chem, TR-06800 Ankara, Turkey", 
        "name": "Ozensoy, Emrah"
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    "description": "In the current contribution, we provide a direct demonstration of the thermally induced surface structural transformations of an alkaline-earth oxide/transition metal oxide interface that is detrimental to the essential catalytic functionality of such mixed-oxide systems toward particular reactants. The BaO(x)/TiO(2)/Pt(111) surface was chosen as a model interfacial system where the enrichment of the surface elemental composition with Ti atoms and the facile diffusion of Ba atoms into the underlying TiO(2) matrix within 523-873 K leads to the formation of perovskite type surface species (BaTiO(3)/Ba(2)TiO(4)/Ba(x)Ti(y)O(z)). At elevated temperatures (T > 973 K), excessive surface segregation of Ti atoms results in an exclusively TiO(2)/TiO(x)-terminated surface which is almost free of Ba species. Although the freshly prepared BaO(x)/TiO(2)/Pt(111) surface can strongly adsorb ubiquitous catalytic adsorbates such as NO(2) and CO(2), a thermally deactivated surface at T > 973 K practically loses all of its NO(2)/CO(2) adsorption capacity due to the deficiency of surface BaO(x) domains.", 
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    "journal": {
      "issue": "45", 
      "pages": "22438-22443", 
      "title": "JOURNAL OF PHYSICAL CHEMISTRY C", 
      "volume": "115"
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    "publication_date": "2011-01-01", 
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    "title": "Direct Evidence for the Instability and Deactivation of Mixed-Oxide Systems: Influence of Surface Segregation and Subsurface Diffusion"
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