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Redox and Catalytic Properties of RhxCe1–xO2−δ Solid Solution Научная публикация

Журнал The Journal of Physical Chemistry C
ISSN: 1932-7447 , E-ISSN: 1932-7455
Вых. Данные Год: 2017, Том: 121, Номер: 48, Страницы: 26925-26938 Страниц : 14 DOI: 10.1021/acs.jpcc.7b09983
Ключевые слова Catalyst activity; Catalytic oxidation; Reduction; Rhodium; Rhodium compounds; Solid solutions; Surface segregation; X ray photoelectron spectroscopy
Авторы Kibis Lidiya S. 1,2 , Kardash Tatyana Yu. 1,2 , Derevyannikova Elizaveta A. 1,2 , Stonkus Olga A. 1,2 , Slavinskaya Elena M. 1,2 , Svetlichnyi Valery A. 3 , Boronin Andrei I. 1,2
Организации
1 Boreskov Institute of Catalysis, Novosibirsk 630090, Russia
2 Novosibirsk State University, Novosibirsk 630090, Russia
3 Tomsk State University, Prospect Lenina 36, 634050 Tomsk, Russia

Информация о финансировании (2)

1 Министерство образования и науки Российской Федерации МК-6911.2016.3
2 Федеральное агентство научных организаций России 0303-2016-0003

Реферат: In this work, a detailed study of the redox properties of solid solution RhxCe1–xO2−δ in correlation with its catalytic activity in CO oxidation reaction was carried out. The ex situ X-ray photoelectron spectroscopy technique was applied to follow the charging states of the elements on the surface during the redox treatments at a temperature range of 25–450 °C. The results were compared with the data of temperature-programmed reduction by CO. The dissolution of rhodium in the ceria bulk considerably increased the mobility of CeO2 lattice oxygen, with redox transitions Ce4+ ↔ Ce3+ and Rh3+ ↔ Rhnδ+ observed already at low temperatures (below 150 °C). The reduced rhodium clusters (Rhnδ+) formed during the reduction treatment significantly improved the catalytic activity of the RhxCe1–xO2−δ solid solution. The small size of the rhodium clusters (Rhnδ+) and high defectiveness of the fluorite phase provided the reversibility of Rhnδ+/CeO2 ↔ RhxCe1–xO2−δ transitions upon redox treatment, resulting in the high reproducibility of the CO conversion curves in the temperature-programmed reaction CO + O2. The homogeneous solid solution was stable up to 800 °C. Above this temperature, the CeO2 volume was depleted of Rh3+ ions because of their partial segregation into the surface and/or subsurface layers with the formation of Rh2O3. For these inhomogeneous samples, the oxygen mobility was considerably lower, while the redox transitions, Ce4+ ↔ Ce3+ and Rh3+ ↔ Rhnδ+, required higher temperatures.
Библиографическая ссылка: Kibis L.S. , Kardash T.Y. , Derevyannikova E.A. , Stonkus O.A. , Slavinskaya E.M. , Svetlichnyi V.A. , Boronin A.I.
Redox and Catalytic Properties of RhxCe1–xO2−δ Solid Solution
The Journal of Physical Chemistry C. 2017. V.121. N48. P.26925-26938. DOI: 10.1021/acs.jpcc.7b09983 WOS Scopus РИНЦ CAPlusCA OpenAlex
Даты:
Поступила в редакцию: 9 окт. 2017 г.
Принята к публикации: 8 нояб. 2017 г.
Опубликована online: 21 нояб. 2017 г.
Опубликована в печати: 7 дек. 2017 г.
Идентификаторы БД:
Web of science: WOS:000417671500038
Scopus: 2-s2.0-85038209237
РИНЦ: 35479811
Chemical Abstracts: 2017:1782094
Chemical Abstracts (print): 168:10034
OpenAlex: W2767217799
Цитирование в БД:
БД Цитирований
Web of science 28
Scopus 28
РИНЦ 29
OpenAlex 31
Альметрики: