Experimental Evidence of Propagating Waves in Hydrogen Oxidation on Platinum-Group Metals (Pt, Rh, Ir) Full article
Journal |
Kinetics and Catalysis
ISSN: 0023-1584 , E-ISSN: 1608-3210 |
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Output data | Year: 2009, Volume: 50, Number: 2, Pages: 304-313 Pages count : 7 DOI: 10.1134/S0023158409020220 | ||
Tags | Hydrogen Oxidation; Single Crystal Surface; Reversible Phase Transition; Electron Energy Loss Spectrum; Propagate Wave Front | ||
Authors |
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Affiliations |
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Funding (1)
1 | Russian Foundation for Basic Research | 08-03-00454 |
Abstract:
The H2(g) + Oads reaction on nanoplanes of Pt-, Rh- and Ir-tips with a radius of ∼103 Å was studied by FEM with a resolution of ∼20 Å, and the critical conditions (P i , T) under which this reaction is accompanied by the formation of a propagating wave front with a sharp boundary between the Hads- and Oads-layers were determined. The H2 + O2 reaction on a Pt-tip under steady-state conditions was studied by FIM with a lateral atomic resolution of ∼5 Å, and images of H2O molecules (H2O+ ions) visualizing the spatial distribution of catalytically active sites (platinum atoms) were obtained for the first time. The origin of the kinetic self-oscillations in isothermal H2 oxidation in situ was investigated in detail. The regular chemical waves were found to be initiated by the reversible phase transition (Pt(100)-hex ↔ 1 × 1) of the Pt(100) nanoplane surface. A stepwise H2O formation mechanism involving OHads-groups was deduced from HREELS and TDS for the Hads + Oads reaction on the Pt(111) and Pt(100) single crystal surfaces.
Cite:
Gorodetskii V.V.
Experimental Evidence of Propagating Waves in Hydrogen Oxidation on Platinum-Group Metals (Pt, Rh, Ir)
Kinetics and Catalysis. 2009. V.50. N2. P.304-313. DOI: 10.1134/S0023158409020220 WOS Scopus РИНЦ
Experimental Evidence of Propagating Waves in Hydrogen Oxidation on Platinum-Group Metals (Pt, Rh, Ir)
Kinetics and Catalysis. 2009. V.50. N2. P.304-313. DOI: 10.1134/S0023158409020220 WOS Scopus РИНЦ
Original:
Городецкий В.В.
Природа подвижных волн в реакции окисления водорода на платиновых металлах (Pt, Rh, Ir)
Кинетика и катализ. 2009. Т.50. №2. С.322-331. РИНЦ
Природа подвижных волн в реакции окисления водорода на платиновых металлах (Pt, Rh, Ir)
Кинетика и катализ. 2009. Т.50. №2. С.322-331. РИНЦ
Dates:
Submitted: | Mar 28, 2008 |
Published print: | Mar 1, 2009 |
Published online: | Apr 24, 2009 |
Identifiers:
Web of science | WOS:000265499100022 |
Scopus | 2-s2.0-65349096135 |
Elibrary | 13610133 |
Chemical Abstracts | 2009:496073 |
Chemical Abstracts (print) | 150:481743 |
OpenAlex | W1981782401 |