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 |
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| 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 |
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| Affiliations |
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Funding (4)
| 1 | Russian Foundation for Basic Research | 09-03-91225 |
| 2 | Russian Foundation for Basic Research | 10-03-00596 |
| 3 | Scientific and Technological Research Council of Turkey | 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
ANCAN
OpenAlex
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
ANCAN
OpenAlex
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 |