Pt/CeO2 and Pt/CeSnOx Catalysts for Low-Temperature CO Oxidation Prepared by Plasma-Arc Technique Научная публикация
| Журнал |
Frontiers in Chemistry
ISSN: 2296-2646 |
||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Вых. Данные | Год: 2019, Том: 7, Номер статьи : 114, Страниц : 17 DOI: 10.3389/fchem.2019.00114 | ||||||||||||
| Ключевые слова | platinum, ceria, tin, CO oxidation, plasma arc synthesis, DFT calculations, Pt/CeO2 catalyst | ||||||||||||
| Авторы |
|
||||||||||||
| Организации |
|
Информация о финансировании (7)
| 1 | Федеральное агентство научных организаций России | 0303-2016-0003 |
| 2 | Российский фонд фундаментальных исследований | 17-03-00754 |
| 3 | Российский фонд фундаментальных исследований | 17-43-540738 |
| 4 | Ministry of Education and Vocational Training | PRX17/00348 |
| 5 | Ministry of Economic Affairs and Digital Transformation | CTQ2015-64618-R |
| 6 | Ministry of Economic Affairs and Digital Transformation | MDM-2017-0767 |
| 7 | Government of Catalonia | 2017SGR13 |
Реферат:
We applied a method of plasma arc synthesis to study effects of modification of the fluorite phase of ceria by tin ions. By sputtering active components (Pt, Ce, Sn) together with carbon from a graphite electrode in a helium ambient we prepared samples of complex highly defective composite PtCeC and PtCeSnC oxide particles stabilized in a matrix of carbon. Subsequent high-temperature annealing of the samples in oxygen removes the carbon matrix and causes the formation of active catalysts Pt/CeOx and Pt/CeSnOx for CO oxidation. In the presence of Sn, X-Ray Diffraction (XRD) and High-Resolution Transmission Electron Microscopy (HRTEM) show formation of a mixed phase CeSnOx and stabilization of more dispersed species with a fluorite-type structure. These factors are essential for the observed high activity and thermic stability of the catalyst modified by Sn. X-Ray Photoelectron Spectroscopy (XPS) reveals the presence of both Pt2+ and Pt4+ ions in the catalyst Pt/CeOx, whereas only the state Pt2+ of platinum could be detected in the Sn-modified catalyst Pt/CeSnOx. Insertion of Sn ions into the Pt/CeOx lattice destabilizes/reduces Pt4+ cations in the Pt/CeSnOx catalyst and induces formation of strikingly high concentration (up to 50% at.) of lattice Ce3+ ions. Our DFT calculations corroborate destabilization of Pt4+ ions by incorporation of cationic Sn in Pt/CeOx. The presented results show that modification of the fluorite lattice of ceria by tin induces substantial amount of mobile reactive oxygen partly due to affecting geometric parameters of ceria by tin ions.
Библиографическая ссылка:
Kardash T.Y.
, Derevyannikova E.A.
, Slavinskaya E.M.
, Stadnichenko A.I.
, Maltsev V.A.
, Zaikovskii A.V.
, Novopashin S.A.
, Boronin A.I.
, Neyman K.M.
Pt/CeO2 and Pt/CeSnOx Catalysts for Low-Temperature CO Oxidation Prepared by Plasma-Arc Technique
Frontiers in Chemistry. 2019.
V.7. 114
:1-17. DOI: 10.3389/fchem.2019.00114
WOS
Scopus
РИНЦ
CAPlusCA
PMID
OpenAlex
Pt/CeO2 and Pt/CeSnOx Catalysts for Low-Temperature CO Oxidation Prepared by Plasma-Arc Technique
Frontiers in Chemistry. 2019.
V.7. 114
:1-17. DOI: 10.3389/fchem.2019.00114
WOS
Scopus
РИНЦ
CAPlusCA
PMID
OpenAlex
Файлы:
Полный текст от издателя
Даты:
| Поступила в редакцию: | 26 нояб. 2018 г. |
| Принята к публикации: | 13 февр. 2019 г. |
| Опубликована в печати: | 12 мар. 2019 г. |
| Опубликована online: | 12 мар. 2019 г. |
Идентификаторы БД:
| Web of science: | WOS:000460954500001 |
| Scopus: | 2-s2.0-85064616810 |
| РИНЦ: | 38673189 |
| Chemical Abstracts: | 2019:1375033 |
| Chemical Abstracts (print): | 176:91025 |
| PMID (PubMed): | 30931295 |
| OpenAlex: | W2920957730 |