Interface Interactions and CO Oxidation Activity of Ag/CeO2 Catalysts: A New Approach Using Model Catalytic Systems | Sciact - CRIS-система Института катализа

Interface Interactions and CO Oxidation Activity of Ag/CeO2 Catalysts: A New Approach Using Model Catalytic Systems Научная публикация

Журнал

Applied Catalysis A: General
ISSN: 0926-860X , E-ISSN: 1873-3875

Вых. Данные

Год: 2019, Том: 570, Страницы: 51-61 Страниц : 11 DOI: 10.1016/j.apcata.2018.11.005

Ключевые слова

Ag/CeO2; CO oxidation; Interfacial interactions; XPS

Авторы

Kibis Lidiya S. ^1,2 , Svintsitskiy Dmitry A. ^1,2 , Kardash Tatyana Yu. ^1,2 , Slavinskaya Elena M. ^1,2 , Gotovtseva Ekaterina Yu. ³ , Svetlichnyi Valery A. ³ , Boronin Andrei I. ^1,2

Организации

1	Boreskov Institute of Catalysis, pr. Lavrentieva 5, 630090, Novosibirsk, Russia
2	Novosibirsk State University, Pirogova St. 2, 630090, Novosibirsk, Russia
3	Tomsk State University, pr. Lenina 36, 634050, Tomsk, Russia

Информация о финансировании (2)

1	Федеральное агентство научных организаций России	0303-2016-0003
2	Российский фонд фундаментальных исследований	16-33-50109

In this paper, we studied in details the nature of the Ag-CeO2 interaction and its influence on the catalytic activity in CO oxidation at low temperature. Ag/CeO2 catalysts were prepared by pulsed laser ablation in liquids (PLA). This method provided the preparation of highly dispersed particles of both an active component and a support. The initial Ag/CeO2 composites did not show activity in the CO oxidation at temperatures <100 °C. However, thermal activation in an oxidizing atmosphere above 450 °C led to a significant improvement of the low-temperature catalytic characteristics and decrease of the activation energy of the reaction by 2 times. A detailed study by physicochemical methods clearly showed that the enhancement of the catalytic properties related to the transition of Ag° particles in contact with CeO2 to ionic Ag+ species. The ionic species were stabilized on the surface of CeO2 without incorporation into the ceria volume. The catalyst activated at 450 °C demonstrated high stability under catalytic conditions due to the effective reversible transition Ag+-CeO2 ↔ Agn°/CeO2, where Agn° – small metal clusters on the CeO2 surface. It is proposed that such reversible transition is facilitated by the defects on the surface of CeO2 nanoparticles. With an increase of the calcination temperature of Ag/CeO2 catalysts above 600 °C, the efficiency of the redox transition decreased due to annealing of CeO2 defects and formation of better-crystallized particles. As a result, catalysts calcined at T>600 °C did not show low-temperature catalytic activity.

Kibis L.S. , Svintsitskiy D.A. , Kardash T.Y. , Slavinskaya E.M. , Gotovtseva E.Y. , Svetlichnyi V.A. , Boronin A.I.
Interface Interactions and CO Oxidation Activity of Ag/CeO2 Catalysts: A New Approach Using Model Catalytic Systems
Applied Catalysis A: General. 2019. V.570. P.51-61. DOI: 10.1016/j.apcata.2018.11.005 WOS Scopus РИНЦ РИНЦ РИНЦ CAPlus OpenAlex

Поступила в редакцию:	1 авг. 2018 г.
Принята к публикации:	5 нояб. 2018 г.
Опубликована online:	6 нояб. 2018 г.
Опубликована в печати:	25 янв. 2019 г.

Web of science:	WOS:000457661500006
Scopus:	2-s2.0-85056468678
РИНЦ:	38625425 \| 41793290 \| 41610197
Chemical Abstracts:	2018:2247746
OpenAlex:	W2899917203

БД	Цитирований
Scopus	49
Web of science	47
РИНЦ	48
OpenAlex	49