Dynamic Studies of Surface Reactions with Microscopic Techniques Full article
Conference |
16th International Seminar on Surface Physics 05-10 Oct 1992 , Kudowa |
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Journal |
Progress in Surface Science
ISSN: 0079-6816 |
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Output data | Year: 1993, Volume: 42, Number: 1-4, Pages: 143-168 Pages count : 26 DOI: 10.1016/0079-6816(93)90067-6 | ||||
Tags | catalytic CO-oxidation; coupled chemical oscillations; Pt(110) surface; single crystal; mechanisms; adsorption; Pd (10) | ||||
Authors |
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Affiliations |
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Funding (3)
1 | German Research Foundation | FB 6/81 |
2 | Max Planck Society | |
3 | Society for Chemical Engineering and Biotechnology |
Abstract:
Work function changes which are combined with surface processes can be investigated and used to characterize adsorption states during heterogeneous catalytic reactions. The oscillatory behaviour of the CO-oxidation was studied on palladium and platinum single crystal surfaces as well as on platinum field emitter tips. On macroscopic crystals the reaction was simultaneously characterized by mass spectrometric analysis and by work function measurements via a Kelvin probe with an area of ≈ 30 mm2 being probed. In a second series of experiments photoelectron emission microscopy (PEEM) was applied to follow surface processes with a spatial resolution of ≈ 1 μm. Finally, Pt surfaces were investigated with a lateral resolution of ≈ 20 Å by using field emission microscopy (FEM).
Gas phase coupling of oscillations as demonstrated by the simultaneous oscillations of two separated macroscopic crystals, was missing at small areas of a field emitter. The PEEM registers local oscillations under conditions where the Kelvin probe fails to register dynamic processes. FEM-data showed that critical radii for nucleation could be as small as few Å.
Cite:
Block J.H.
, Ehsasi M.
, Gorodetskii V.
Dynamic Studies of Surface Reactions with Microscopic Techniques
Progress in Surface Science. 1993. V.42. N1-4. P.143-168. DOI: 10.1016/0079-6816(93)90067-6 WOS Scopus РИНЦ
Dynamic Studies of Surface Reactions with Microscopic Techniques
Progress in Surface Science. 1993. V.42. N1-4. P.143-168. DOI: 10.1016/0079-6816(93)90067-6 WOS Scopus РИНЦ
Dates:
Published print: | Jan 1, 1993 |
Published online: | Sep 9, 2002 |
Identifiers:
Web of science | WOS:A1993LF59200018 |
Scopus | 2-s2.0-0027148702 |
Elibrary | 31071080 |
Chemical Abstracts | 1993:589330 |
Chemical Abstracts (print) | 119:189330 |
OpenAlex | W1976263630 |