Origin of Temperature Oscillations of Nickel Catalyst Occurring in Methane Oxidation Научная публикация
Журнал |
Kinetics and Catalysis
ISSN: 0023-1584 , E-ISSN: 1608-3210 |
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Вых. Данные | Год: 2015, Том: 56, Номер: 5, Страницы: 598-604 Страниц : 7 DOI: 10.1134/S002315841505016X | ||||||
Ключевые слова | methane oxidation, nickel catalysts, oxidation mechanism, temperature oscillations | ||||||
Авторы |
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Организации |
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Информация о финансировании (2)
1 | Федеральное агентство научных организаций России | 81 |
2 | Совет по грантам Президента Российской Федерации | НШ-5340.2014.3 |
Реферат:
The catalytic oxidation of methane over a nickel foil has been investigated in a wide range of methane: oxygen molar ratios at a constant reactor temperature of 680°C. Under oxygen-deficient conditions, the reaction takes place in the self-oscillating mode. Stable self-sustained oscillations of the methane oxidation rate are observed in the CH4: O2 molar ratio range from 2: 1 to 19: 1. This process is accompanied by catalyst temperature oscillations, whose amplitude reaches 80°C. It has been demonstrated by scanning electron microscopy that the origination of the self-sustained oscillations is accompanied by morphological changes in the catalyst surface. Under the action of the reaction medium, a porous layer 5–10 µm in thickness forms on the nickel foil surface. The mechanism of methane oxidation over nickel that accounts for the onset of the self-sustained oscillations is discussed. This mechanism is based on periodical nickel oxidation and reduction. When nickel is in the high-activity state, it is mainly in metallic form, and the passage of nickel into its low-activity state is accompanied by the formation of a nickel oxide layer on the foil surface. The reduction of this nickel oxide causes a periodic decrease in the catalyst temperature. The total and partial oxidations of methane on the reduced surface of the nickel foil raise the catalyst temperature. Under oxygen-deficient conditions, a carbon deposit builds up on the catalyst surface, and the combustion of this deposit complicates the catalyst temperature oscillation profile.
Библиографическая ссылка:
Saraev A.A.
, Kosolobov S.S.
, Kaichev V.V.
, Bukhtiyarov V.I.
Origin of Temperature Oscillations of Nickel Catalyst Occurring in Methane Oxidation
Kinetics and Catalysis. 2015. V.56. N5. P.598-604. DOI: 10.1134/S002315841505016X WOS Scopus РИНЦ
Origin of Temperature Oscillations of Nickel Catalyst Occurring in Methane Oxidation
Kinetics and Catalysis. 2015. V.56. N5. P.598-604. DOI: 10.1134/S002315841505016X WOS Scopus РИНЦ
Оригинальная версия:
Сараев А.А.
, Косолобов С.С.
, Каичев В.В.
, Бухтияров В.И.
Природа осцилляций температуры никелевого катализатора, возникающих при окислении метана
Кинетика и катализ. 2015. Т.56. №5. С.606-613. DOI: 10.7868/S0453881115050160 РИНЦ
Природа осцилляций температуры никелевого катализатора, возникающих при окислении метана
Кинетика и катализ. 2015. Т.56. №5. С.606-613. DOI: 10.7868/S0453881115050160 РИНЦ
Даты:
Поступила в редакцию: | 7 июн. 2014 г. |
Принята к публикации: | 11 февр. 2015 г. |
Опубликована в печати: | 1 сент. 2015 г. |
Опубликована online: | 23 сент. 2015 г. |
Идентификаторы БД:
Web of science | WOS:000361757300006 |
Scopus | 2-s2.0-84942609871 |
РИНЦ | 24955793 |
Chemical Abstracts | 2015:1541513 |
OpenAlex | W1939702181 |