Direct Evidence for the Instability and Deactivation of Mixed-Oxide Systems: Influence of Surface Segregation and Subsurface Diffusion Full article
Journal |
The Journal of Physical Chemistry C
ISSN: 1932-7447 , E-ISSN: 1932-7455 |
||||
---|---|---|---|---|---|
Output data | Year: 2011, Volume: 115, Number: 45, Pages: 22438-22443 Pages count : 16 DOI: 10.1021/jp206969h | ||||
Tags | Adsorption; Atoms; Barium; Barium compounds; Carbon dioxide; Metallic compounds; Nitrogen oxides; Perovskite; Platinum; Titanium dioxide | ||||
Authors |
|
||||
Affiliations |
|
Funding (4)
1 | Russian Foundation for Basic Research | 09-03-91225 |
2 | Russian Foundation for Basic Research | 10-03-00596 |
3 | Türkiye Bilimsel ve Teknolojik Araştırma Kurumu | 107Y115 |
4 | Türkiye Bilimler Akademisi |
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 BaOx/TiO2/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 TiO2 matrix within 523–873 K leads to the formation of perovskite type surface species (BaTiO3/Ba2TiO4/BaxTiyOz). At elevated temperatures (T > 973 K), excessive surface segregation of Ti atoms results in an exclusively TiO2/TiOx-terminated surface which is almost free of Ba species. Although the freshly prepared BaOx/TiO2/Pt(111) surface can strongly adsorb ubiquitous catalytic adsorbates such as NO2 and CO2, a thermally deactivated surface at T > 973 K practically loses all of its NO2/CO2 adsorption capacity due to the deficiency of surface BaOx domains.
Cite:
Emmez E.
, Vovk E.I.
, Bukhtiyarov V.I.
, Ozensoy E.
Direct Evidence for the Instability and Deactivation of Mixed-Oxide Systems: Influence of Surface Segregation and Subsurface Diffusion
The Journal of Physical Chemistry C. 2011. V.115. N45. P.22438-22443. DOI: 10.1021/jp206969h WOS Scopus РИНЦ
Direct Evidence for the Instability and Deactivation of Mixed-Oxide Systems: Influence of Surface Segregation and Subsurface Diffusion
The Journal of Physical Chemistry C. 2011. V.115. N45. P.22438-22443. DOI: 10.1021/jp206969h WOS Scopus РИНЦ
Files:
Full text from publisher
Dates:
Submitted: | Jul 21, 2011 |
Accepted: | Sep 30, 2011 |
Published online: | Oct 26, 2011 |
Published print: | Nov 17, 2011 |
Identifiers:
Web of science | WOS:000296685800043 |
Scopus | 2-s2.0-80955149372 |
Elibrary | 18013229 |
Chemical Abstracts | 2011:1290163 |
Chemical Abstracts (print) | 155:600115 |
OpenAlex | W2323348134 |