Interaction Between Oxygen and Polycrystalline Palladium at O2 Pressures of 10-6-10 Pa Научная публикация
| Журнал |
Kinetics and Catalysis
ISSN: 0023-1584 , E-ISSN: 1608-3210 |
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| Вых. Данные | Год: 2009, Том: 50, Номер: 1, Страницы: 31-39 Страниц : 9 DOI: 10.1134/S0023158409010054 | ||
| Ключевые слова | Palladium; Oxygen Uptake; Subsurface Layer; Oxygen Sorption; Chemisorb Oxygen Atom | ||
| Авторы |
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| Организации |
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Реферат:
The interaction between oxygen and polycrystalline palladium (Pd(poly)) at PO2 = 2.6 × 10−6–10 Pa and T = 300–1300 K was studied by the thermal desorption (TD) method. The interaction between O2 and Pd(poly) is governed by the O2 pressure and the sample temperature. At low pressures of PO2 (≤1.3 × 10−5 Pa), O2 is chemisorbed dissociatively on the Pd(poly) surface. During chemisorption, the Oads-surface bond energy and the O2 sticking coefficient gradually decrease as the surface coverage θ increases. At PO2 ≥ 10−2 Pa and T ≤ 500 K, after the saturation of the Oads layer (θ ∼ 0.5), Oads atoms penetrate under the surface layer of the metal to form surface palladium oxide. At PO2 ≥ 1 Pa and T > 500 K, after the saturation of the surface oxide film 2 ML in thickness (n ∼ 2), Oads atoms penetrate into the oxide film and then into the subsurface palladium layer and diffuse deep into the metal bulk. As a result, the oxygen uptake at 700 K is n ∼ 50. Upon heating, the surface oxides decompose, desorbing O2, which gives rise to a low-temperature TD peak with T max = 715 K. The release of oxygen inserted in the subsurface layers of palladium shows itself as a distinct high-temperature TD peak with T max ≥ 750 K.
Библиографическая ссылка:
Salanov A.N.
, Suprun E.A.
Interaction Between Oxygen and Polycrystalline Palladium at O2 Pressures of 10-6-10 Pa
Kinetics and Catalysis. 2009. V.50. N1. P.31-39. DOI: 10.1134/S0023158409010054 WOS Scopus РИНЦ CAPlusCA OpenAlex
Interaction Between Oxygen and Polycrystalline Palladium at O2 Pressures of 10-6-10 Pa
Kinetics and Catalysis. 2009. V.50. N1. P.31-39. DOI: 10.1134/S0023158409010054 WOS Scopus РИНЦ CAPlusCA OpenAlex
Оригинальная:
Саланов А.Н.
, Супрун Е.А.
Исследование взаимодействия кислорода с поликристаллическим палладием при давлениях О2 10-6 – 10 Па
Кинетика и катализ. 2009. Т.50. №1. С.36-45. РИНЦ
Исследование взаимодействия кислорода с поликристаллическим палладием при давлениях О2 10-6 – 10 Па
Кинетика и катализ. 2009. Т.50. №1. С.36-45. РИНЦ
Даты:
| Поступила в редакцию: | 28 мар. 2008 г. |
| Опубликована в печати: | 1 янв. 2009 г. |
| Опубликована online: | 18 апр. 2009 г. |
Идентификаторы БД:
| Web of science: | WOS:000265298500005 |
| Scopus: | 2-s2.0-65249141632 |
| РИНЦ: | 13605974 |
| Chemical Abstracts: | 2009:328900 |
| Chemical Abstracts (print): | 150:291775 |
| OpenAlex: | W2149815188 |