1 Ocak 2011 Dergi makalesi Açık Erişim

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

Citation Style Language JSON

{
  "DOI": "10.1021/jp206969h", 
  "abstract": "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.", 
  "author": [
    {
      "family": "Emmez", 
      "given": " Emre"
    }, 
    {
      "family": "Vovk", 
      "given": " Evgeny I."
    }, 
    {
      "family": "Bukhtiyarov", 
      "given": " Valerii I."
    }, 
    {
      "family": "Ozensoy", 
      "given": " Emrah"
    }
  ], 
  "container_title": "JOURNAL OF PHYSICAL CHEMISTRY C", 
  "id": "21001", 
  "issue": "45", 
  "issued": {
    "date-parts": [
      [
        2011, 
        1, 
        1
      ]
    ]
  }, 
  "page": "22438-22443", 
  "title": "Direct Evidence for the Instability and Deactivation of Mixed-Oxide Systems: Influence of Surface Segregation and Subsurface Diffusion", 
  "type": "article-journal", 
  "volume": "115"
}