1 Ocak 2011 Dergi makalesi Açık Erişim

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

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  <dc:creator>Emmez, Emre</dc:creator>
  <dc:creator>Vovk, Evgeny I.</dc:creator>
  <dc:creator>Bukhtiyarov, Valerii I.</dc:creator>
  <dc:creator>Ozensoy, Emrah</dc:creator>
  <dc:date>2011-01-01</dc:date>
  <dc: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 &gt; 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 &gt; 973 K practically loses all of its NO(2)/CO(2) adsorption capacity due to the deficiency of surface BaO(x) domains.</dc:description>
  <dc:identifier>https://aperta.ulakbim.gov.trrecord/21001</dc:identifier>
  <dc:identifier>oai:zenodo.org:21001</dc:identifier>
  <dc:rights>info:eu-repo/semantics/openAccess</dc:rights>
  <dc:rights>http://www.opendefinition.org/licenses/cc-by</dc:rights>
  <dc:source>JOURNAL OF PHYSICAL CHEMISTRY C 115(45) 22438-22443</dc:source>
  <dc:title>Direct Evidence for the Instability and Deactivation of Mixed-Oxide Systems: Influence of Surface Segregation and Subsurface Diffusion</dc:title>
  <dc:type>info:eu-repo/semantics/article</dc:type>
  <dc:type>publication-article</dc:type>
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