Atomic Structure of Pd-, Pt-, and PdPt-Based Catalysts of Total Oxidation of Methane: In Situ EXAFS Study | Sciact - CRIS-система Института катализа

Atomic Structure of Pd-, Pt-, and PdPt-Based Catalysts of Total Oxidation of Methane: In Situ EXAFS Study Научная публикация

Журнал

Catalysts
ISSN: 2073-4344

Вых. Данные

Год: 2021, Том: 11, Номер: 12, Номер статьи : 1446, Страниц : 13 DOI: 10.3390/catal11121446

Ключевые слова

Bimetallic catalysts; Core-shell structure; High-angle annular dark-field imaging scanning transmission electron microscopy (HAADF STEM); In situ EXAFS spectroscopy; Total methane oxidation

Авторы

Saraev Andrey A. ^1,2 , Yashnik Svetlana A. ¹ , Gerasimov Evgeny Yu. ¹ , Kremneva Anna M. ¹ , Vinokurov Zakhar S. ^1,2 , Kaichev Vasily V. ¹

Организации

1	Department of Investigation of Catalysts, Boreskov Institute of Catalysis, Lavrentev Ave., 5, 630090 Novosibirsk, Russia
2	Synchrotron Radiation Facility SKIF, Boreskov Institute of Catalysis, Nikol’skiy Ave., 1, 630559 Kol’tsovo, Russia

Информация о финансировании (2)

1	Министерство науки и высшего образования Российской Федерации (с 15 мая 2018)	ГЗ-2021-2023
2	Российский фонд фундаментальных исследований	20-33-70124

In this study, 3%Pd/Al2O3, 3%Pt/Al2O3 and bimetallic (1%Pd + 2%Pt)/Al2O3 catalysts were examined in the total oxidation of methane in a temperature range of 150–400 °C. The evolution of the active component under the reaction conditions was studied by transmission electron microscopy and in situ extended X-ray absorption fine structure (EXAFS) spectroscopy. It was found that the platinum and bimetallic palladium-platinum catalysts are more stable against sintering than the palladium catalysts. For all the catalysts, the active component forms a “core-shell” structure in which the metallic core is covered by an oxide shell. The “core-shell” structure for the platinum and bimetallic palladium-platinum catalysts is stable in the temperature range of 150–400 °C. However, in the case of the palladium catalysts the metallic core undergoes the reversible oxidation at temperatures above 300 °C and reduced to the metallic state with the decrease in the reaction temperature. The scheme of the active component evolution during the oxidation of methane is proposed and discussed. © 2021 by the authors. Licensee MDPI, Basel, Switzerland.

Saraev A.A. , Yashnik S.A. , Gerasimov E.Y. , Kremneva A.M. , Vinokurov Z.S. , Kaichev V.V.
Atomic Structure of Pd-, Pt-, and PdPt-Based Catalysts of Total Oxidation of Methane: In Situ EXAFS Study
Catalysts. 2021. V.11. N12. 1446 :1-13. DOI: 10.3390/catal11121446 WOS Scopus РИНЦ CAPlus OpenAlex СКИФ ID

Поступила в редакцию:	10 нояб. 2021 г.
Принята к публикации:	26 нояб. 2021 г.
Опубликована online:	27 нояб. 2021 г.
Опубликована в печати:	1 дек. 2021 г.

Web of science:	WOS:000735920200001
Scopus:	2-s2.0-85119977613
РИНЦ:	47535818
Chemical Abstracts:	2022:90297
OpenAlex:	W3215850630
СКИФ ID:	1474

БД	Цитирований
Scopus	6
Web of science	7
РИНЦ	8
OpenAlex	8