Nucleation of chemical waves at structural defects: a mirror electron microscopy study of catalytic CO oxidation on Pt(110)
The formation of reaction fronts during the catalytic oxidation of carbon monoxide on Pt(110) has been investigated with mirror electron microscopy (MEM). The reaction was studied in the 10 exp -5 mbar range at Tapprox430-450K under conditions where spatio-temporal pattern formation occurs. Nucleati...
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| Published in: | Surface science Vol. 352-354; pp. 258 - 262 |
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| Main Authors: | , , , , , |
| Format: | Journal Article |
| Language: | English |
| Published: |
04-09-1995
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| Online Access: | Get full text |
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| Summary: | The formation of reaction fronts during the catalytic oxidation of carbon monoxide on Pt(110) has been investigated with mirror electron microscopy (MEM). The reaction was studied in the 10 exp -5 mbar range at Tapprox430-450K under conditions where spatio-temporal pattern formation occurs. Nucleation of reaction fronts was always found to take place at surface defects. While the CO front nucleates as a circular spot, the oxygen front first spreads out very rapidly along the [110] direction. Often, the reaction fronts fail to propagate away entirely from the defects, and instead a kind of breathing mode is observed. Rotating spiral waves can be identified, the cores of which are not attached to structural defects, but meander freely. |
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| Bibliography: | SourceType-Scholarly Journals-2 ObjectType-Conference Paper-1 content type line 23 SourceType-Conference Papers & Proceedings-1 ObjectType-Feature-2 ObjectType-Article-3 |
| ISSN: | 0039-6028 |