Self-Sustained Oscillations in Oxidation of Methane over Palladium: The Nature of “Low-Active” and “Highly Active” States Научная публикация
| Журнал |
Catalysis Science and Technology
ISSN: 2044-4753 , E-ISSN: 2044-4761 |
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| Вых. Данные | Год: 2021, Том: 11, Номер: 13, Страницы: 4392-4397 Страниц : 6 DOI: 10.1039/d1cy00132a | ||
| Ключевые слова | CATALYST TEMPERATURE OSCILLATIONS; IN-SITU; CARBON-MONOXIDE; COMBUSTION; DEPENDENCE; PLATINUM; BEHAVIOR; Pd(111); NICKEL; PHASE | ||
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| Организации |
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Информация о финансировании (2)
| 1 | Российский фонд фундаментальных исследований | 19-03-00419 |
| 2 | Министерство науки и высшего образования Российской Федерации (с 15 мая 2018) | 0239-2021-0003 |
Реферат:
The oxidation of methane was studied in a flow reactor at atmospheric pressure using palladium foil as a catalyst. It was shown that regular self-sustained reaction rate oscillations occur under oxygen-deficient conditions. CO, CO2, H2, and H2O were detected as products when the catalyst was in a highly active state. The signals of CO and H2 were small, indicating that the total oxidation is the main reaction. According to the operando X-ray diffraction and mass spectrometry study, the driving force for the oscillations is periodic oxidation and reduction of palladium. The highly active state is palladium in the metallic state, and the transition to the low-active state is accompanied by the growth of a PdO film on the palladium surface. The decomposition of PdO is accompanied by the formation of a Pd carbide layer. This is a result of accumulation of carbon on the highly active surface of metallic palladium and its subsequent dissolution in the bulk of palladium. The dissolution of carbon in the subsurface layers of palladium has no a significant effect on its catalytic activity. The oscillatory mechanism for the oxidation of methane over palladium is discussed.
Библиографическая ссылка:
Kaichev V.V.
, Vinokurov Z.S.
, Saraev A.A.
Self-Sustained Oscillations in Oxidation of Methane over Palladium: The Nature of “Low-Active” and “Highly Active” States
Catalysis Science and Technology. 2021. V.11. N13. P.4392-4397. DOI: 10.1039/d1cy00132a WOS Scopus РИНЦ CAPlus OpenAlex
Self-Sustained Oscillations in Oxidation of Methane over Palladium: The Nature of “Low-Active” and “Highly Active” States
Catalysis Science and Technology. 2021. V.11. N13. P.4392-4397. DOI: 10.1039/d1cy00132a WOS Scopus РИНЦ CAPlus OpenAlex
Даты:
| Поступила в редакцию: | 26 янв. 2021 г. |
| Принята к публикации: | 30 апр. 2021 г. |
| Опубликована online: | 4 мая 2021 г. |
| Опубликована в печати: | 7 июл. 2021 г. |
Идентификаторы БД:
| Web of science: | WOS:000652863200001 |
| Scopus: | 2-s2.0-85109218085 |
| РИНЦ: | 46878590 |
| Chemical Abstracts: | 2021:1019928 |
| OpenAlex: | W3158283650 |