Stages in the Modification of a Silver Surface for Catalysis of the Partial Oxidation of Ethylene. I. Action of Oxygen Научная публикация
Журнал |
Journal of Catalysis
ISSN: 0021-9517 , E-ISSN: 1090-2694 |
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Вых. Данные | Год: 1994, Том: 150, Номер: 2, Страницы: 262-267 Страниц : 6 DOI: 10.1006/jcat.1994.1344 | ||
Ключевые слова | OXYGEN-ADSORPTION; AG(110) SURFACE; EPOXIDATION; CHEMISORPTION; SPECTROSCOPY; MECHANISM; STATES; CARBON; XPS; CO | ||
Авторы |
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Организации |
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Реферат:
The interaction of silver foil with oxygen over a wide range of temperatures and O2 pressures has been studied by XPS, TPD, and TPR. It has been shown that depending on the treatment conditions two adsorbed oxygen states with a different ionicity of the AgO bond can be formed, as well as oxygen dissolved in the silver bulk. "Ionic" oxygen [Eb(O 1s) = 528.4 eV] is formed in the initial step of O2 adsorption, its incorporation into uppermost silver layer proceeding at T > 420 K. This state is responsible for ethylene adsorption, followed by its destruction and complete oxidation to CO2 and H2O. Dissolution of oxygen atoms in the silver bulk starts at T > 470 K. No effect of the dissolved oxygen on the electronic and catalytic properties of the "ionic" oxygen has been revealed. Accumulation of "covalent" oxygen [Eb (O 1s = 530.5 eV] occurs at higher temperature and pressure. A possible mechanism for its formation which includes the creation of specific defective sites on silver surface is discussed. Despite a large variation of pressures and temperatures used for the modification of clean silver foil by O2, all attempts to produce a surface active in ethylene epoxidation have failed.
Библиографическая ссылка:
Bukhtiyarov V.I.
, Boronin A.I.
, Savchenko V.I.
Stages in the Modification of a Silver Surface for Catalysis of the Partial Oxidation of Ethylene. I. Action of Oxygen
Journal of Catalysis. 1994. V.150. N2. P.262-267. DOI: 10.1006/jcat.1994.1344 WOS Scopus РИНЦ
Stages in the Modification of a Silver Surface for Catalysis of the Partial Oxidation of Ethylene. I. Action of Oxygen
Journal of Catalysis. 1994. V.150. N2. P.262-267. DOI: 10.1006/jcat.1994.1344 WOS Scopus РИНЦ
Даты:
Поступила в редакцию: | 16 авг. 1991 г. |
Принята к публикации: | 11 апр. 1994 г. |
Опубликована в печати: | 1 дек. 1994 г. |
Опубликована online: | 25 мая 2002 г. |
Идентификаторы БД:
Web of science | WOS:A1994PX19800005 |
Scopus | 2-s2.0-43949152600 |
РИНЦ | 30887420 |
Chemical Abstracts | 1995:264311 |
Chemical Abstracts (print) | 122:65408 |
OpenAlex | W2067081185 |