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In Situ X-Ray Absorption Spectroscopy Studies of Carbon Monoxide Oxidation in the Presence of Nanocomposite Cu–Fe–Al Oxide Catalysts Научная публикация

Журнал Kinetics and Catalysis
ISSN: 0023-1584 , E-ISSN: 1608-3210
Вых. Данные Год: 2021, Том: 62, Номер: 1, Страницы: 160–171 Страниц : 12 DOI: 10.1134/S0023158421010079
Ключевые слова CO oxidation, nanocomposites, CuO, in situ studies, reaction mechanism
Авторы Kremneva A.M. 1 , Fedorov A.V. 1 , Saraev A.A. 1 , Bulavchenko O.A. 1 , Yakovlev V.A. 1 , Kaichev V.V. 1
Организации
1 Federal Research Center Boreskov Institute of Catalysis, Novosibirsk, 630090 Russia

Информация о финансировании (1)

1 Российский научный фонд 17-73-20157

Реферат: Nanocomposite Fe–Al and Cu–Fe–Al oxide catalysts are studied in the CO oxidation reaction. It is shown that the introduction of copper leads to a more than two orders of magnitude increase in the reaction rate. The most active catalyst is a nanocomposite containing 5 wt % CuO, 78 wt % Fe2O3, and 17 wt % Al2O3. According to X-ray diffraction analysis, the catalysts consist of hematite nanoparticles, α-Fe2O3, and amorphous alumina. Copper is in a highly dispersed state to form CuO and CuFeOx clusters. Results of in situ X‑ray absorption spectroscopy studies suggest that the reduction of copper from Cu2+ to Cu1+ and Cu0 in a CO stream begins at a temperature of 200–250°C; at 400–600°C, copper is mostly in the metallic state; the Fe3O4 → FeO → Fe reduction begins at 400–500°С. In a stoichiometric mixture of CO and O2, Fe3+ does not undergo reduction; the reduction of copper oxide to metal occurs at temperatures above 400°C. In the presence of excess oxygen in a temperature range of 100–600°C, no changes in the chemical state of the catalysts are detected. The mechanism of CO oxidation in the presence of Cu–Fe–Al nanocomposites is proposed.
Библиографическая ссылка: Kremneva A.M. , Fedorov A.V. , Saraev A.A. , Bulavchenko O.A. , Yakovlev V.A. , Kaichev V.V.
In Situ X-Ray Absorption Spectroscopy Studies of Carbon Monoxide Oxidation in the Presence of Nanocomposite Cu–Fe–Al Oxide Catalysts
Kinetics and Catalysis. 2021. V.62. N1. P.160–171. DOI: 10.1134/S0023158421010079 WOS Scopus РИНЦ CAPlusCA OpenAlex
Оригинальная: Кремнева А.М. , Федоров А.В. , Сараев А.А. , Булавченко О.А. , Яковлев В.А. , Каичев В.В.
In situ исследование окисления CO на нанокомпозитных Cu–Fe–Al-оксидных катализаторах методами спектроскопии рентгеновского поглощения
Кинетика и катализ. 2021. Т.62. №1. С.94-108. DOI: 10.31857/s045388112101007x РИНЦ OpenAlex
Даты:
Поступила в редакцию: 12 мая 2020 г.
Принята к публикации: 20 июл. 2020 г.
Опубликована в печати: 1 янв. 2021 г.
Опубликована online: 3 мар. 2021 г.
Идентификаторы БД:
Web of science: WOS:000625135300018
Scopus: 2-s2.0-85102141037
РИНЦ: 46759559
Chemical Abstracts: 2021:567119
Chemical Abstracts (print): 174:917466
OpenAlex: W3134368072
Цитирование в БД:
БД Цитирований
Scopus 3
Web of science 2
РИНЦ 3
OpenAlex 3
Альметрики: