X-Ray-Induced Transformations on the Surface of MoVNbTe Mixed Oxide Catalyst: An XPS Study Научная публикация
| Журнал |
Applied Surface Science
ISSN: 0169-4332 |
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| Вых. Данные | Год: 2021, Том: 535, Номер статьи : 147676, Страниц : 9 DOI: 10.1016/j.apsusc.2020.147676 | ||||
| Ключевые слова | Mixed oxide; Molybdenum; MoVNbTeO; Photoelectron spectroscopy; Tellurium; X-ray-induced reduction | ||||
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| Организации |
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Информация о финансировании (1)
| 1 | Российский научный фонд | 17-73-20073 |
Реферат:
MoVNbTe mixed oxide, which is used as a catalyst for the oxidative dehydrogenation of ethane, was investigated by the XPS technique during prolonged treatment with X-rays. This treatment caused a modification of the MoVNbTe oxide surface related to the reduction of V, Mo, and Te species. This behavior is supposed to be related to the interaction of oxide with secondary electrons emitted during X-ray absorption. Firstly, the reduction of Te4+ into Te0 species, accompanied by the removal of no more than ~ 5% of overall oxygen from the surface/subsurface region, was found during ~ 8.5 h under X-rays. After ~ 28 h of exposure, the significant surface restructuring resulted in a change in the relative amounts of V and Te. This was accompanied by a high degree of surface reduction and the appearance of V3+ species. Under X-rays, an abnormal broadening of Mo 3d spectral lines was observed in contrast to other photoelectron regions. The possible reasons for this phenomenon were discussed. The limit for the amount of lattice oxygen, which might be extracted with the preservation of the pristine surface structure of MoVNbTe oxide, was in the range from 5 to 7%. © 2020 Elsevier B.V.
Библиографическая ссылка:
Svintsitskiy D.A.
, Kardash T.Y.
, Lazareva E.V.
, Bondareva V.M.
X-Ray-Induced Transformations on the Surface of MoVNbTe Mixed Oxide Catalyst: An XPS Study
Applied Surface Science. 2021. V.535. 147676 :1-9. DOI: 10.1016/j.apsusc.2020.147676 WOS Scopus РИНЦ CAPlus OpenAlex
X-Ray-Induced Transformations on the Surface of MoVNbTe Mixed Oxide Catalyst: An XPS Study
Applied Surface Science. 2021. V.535. 147676 :1-9. DOI: 10.1016/j.apsusc.2020.147676 WOS Scopus РИНЦ CAPlus OpenAlex
Даты:
| Поступила в редакцию: | 20 апр. 2020 г. |
| Принята к публикации: | 24 авг. 2020 г. |
| Опубликована online: | 29 авг. 2020 г. |
| Опубликована в печати: | 1 янв. 2021 г. |
Идентификаторы БД:
| Web of science: | WOS:000582373900034 |
| Scopus: | 2-s2.0-85090227150 |
| РИНЦ: | 45362421 |
| Chemical Abstracts: | 2020:1770462 |
| OpenAlex: | W3081659056 |