The Surface Specificity of the Oscillating CO Oxidation on Platinum Investigated by Field Ion Microscopy Full article
Conference |
40th International Field Emission Symposium 02-06 Aug 1993 , Nagoya |
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Journal |
Applied Surface Science
ISSN: 0169-4332 |
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Output data | Year: 1994, Volume: 76-77, Number: 1-4, Pages: 122-128 Pages count : 7 DOI: 10.1016/0169-4332(94)90332-8 | ||||
Tags | Carbon monoxide; Ion microscopes; Microscopic examination; Platinum; Surface properties | ||||
Authors |
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Affiliations |
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Funding (1)
1 | Max Planck Society |
Abstract:
The in-situ observation of the CO oxidation in the field ion microscope is possible due to the preferential field ionization of molecular oxygen which acts as imaging gas and displays Oad sites with atomic resolution. A dynamic bistability of the oxidation reaction is caused by catalytically inactive COad-covered Pt surfaces and active Oad-covered ones. Self-sustained long-lasting oscillations of the Full-size image (<1 K) O2 → CO2 reaction are investigated at pCO ≈ 10-6 to 10-5 mbar, pO2 ≈ 1 × 10-4 to 5 × 10-4 mbar, and temperatures of T = 330 K to 550 K. Oscillation frequencies increase from 10-3 s-1 at 330 K to 1 s-1 at 550 K. A pronounced surface selectivity is found, surface regions near the {110} planes, i.e. {331} terraces, act as pacemakers. The Pt{111} planes are always COad-covered and do not participate in oscillations. Some general conclusions are drawn on the surface specificity of catalytic surface reactions and on still open questions of oscillating surface reactions.
Cite:
Gorodetskii V.
, Drachsel W.
, Block J.H.
The Surface Specificity of the Oscillating CO Oxidation on Platinum Investigated by Field Ion Microscopy
Applied Surface Science. 1994. V.76-77. N1-4. P.122-128. DOI: 10.1016/0169-4332(94)90332-8 WOS Scopus РИНЦ
The Surface Specificity of the Oscillating CO Oxidation on Platinum Investigated by Field Ion Microscopy
Applied Surface Science. 1994. V.76-77. N1-4. P.122-128. DOI: 10.1016/0169-4332(94)90332-8 WOS Scopus РИНЦ
Dates:
Submitted: | Aug 2, 1993 |
Accepted: | Aug 31, 1993 |
Published print: | Mar 2, 1994 |
Published online: | Oct 10, 2002 |
Identifiers:
Web of science | WOS:A1994ND58700022 |
Scopus | 2-s2.0-0028383688 |
Elibrary | 31085502 |
Chemical Abstracts | 1994:308422 |
Chemical Abstracts (print) | 120:308422 |
OpenAlex | W1974712431 |