Dissolution of Oxygen in Polycrystalline Palladium at = 100 Pa and Temperatures of 500 to 950 K Full article
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Kinetics and Catalysis
ISSN: 0023-1584 , E-ISSN: 1608-3210 |
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| Output data | Year: 2017, Volume: 58, Number: 1, Pages: 92-103 Pages count : 12 DOI: 10.1134/S0023158417010116 | ||
| Tags | oxygen, oxygen diffusion and dissolution, polycrystalline palladium, surface oxide film | ||
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| Affiliations |
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Funding (1)
| 1 | Federal Agency for Scientific Organizations | V.44.1.17. (0303-2014-0003) |
Abstract:
The dissolution of oxygen in polycrystalline palladium Pd(poly) at an O2 pressure of 100 Pa and temperatures of 500–950 K has been investigated by temperature-programmed desorption. At 500 K, the process yields a surface palladium film that includes an oxide-like reconstructed structure on a rarefied metal surface layer. At this temperature, palladium sorbs ~2 monolayers (ML) of oxygen. At 600–800 K, palladium dissolves up to ~140 ML of oxygen as a result of O2 chemisorption on the surface of the oxide film, penetration of Oads atoms under the oxide film, and their diffusion into the metal bulk. The dependence of the amount of oxygen sorbed by Pd(poly) (n) on the time of exposure to an O2 atmosphere is described by a nearparabolic function, n = atb, indicating that oxygen atoms diffuse in the metal lattice. The activation energy of this diffusion, Еdif, is ~83.5 kJ/mol. At high temperatures (800–950 K), palladium sorbs much less oxygen (≤10 ML). This is due to the complete decomposition of the surface oxide film, a process that markedly hampers the insertion of Oads atoms under the surface layer of the metal.
Cite:
Suprun E.A.
, Salanov A.N.
Dissolution of Oxygen in Polycrystalline Palladium at = 100 Pa and Temperatures of 500 to 950 K
Kinetics and Catalysis. 2017. V.58. N1. P.92-103. DOI: 10.1134/S0023158417010116 WOS Scopus РИНЦ AN OpenAlex
Dissolution of Oxygen in Polycrystalline Palladium at = 100 Pa and Temperatures of 500 to 950 K
Kinetics and Catalysis. 2017. V.58. N1. P.92-103. DOI: 10.1134/S0023158417010116 WOS Scopus РИНЦ AN OpenAlex
Original:
Супрун Е.А.
, Саланов А.Н.
Растворение кислорода в поликристаллическом палладии при = 100 Па и температурах от 500 до 950 К
Кинетика и катализ. 2017. Т.58. №1. С.98-111. DOI: 10.7868/S0453881117010129 РИНЦ OpenAlex
Растворение кислорода в поликристаллическом палладии при = 100 Па и температурах от 500 до 950 К
Кинетика и катализ. 2017. Т.58. №1. С.98-111. DOI: 10.7868/S0453881117010129 РИНЦ OpenAlex
Dates:
| Submitted: | Feb 14, 2016 |
| Published print: | Jan 1, 2017 |
| Published online: | Mar 5, 2017 |
Identifiers:
| Web of science: | WOS:000396309700012 |
| Scopus: | 2-s2.0-85014457242 |
| Elibrary: | 29480190 |
| Chemical Abstracts: | 2017:408561 |
| OpenAlex: | W2591613340 |