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  Dynamic studies of surface reactions with microscopic techniques

Block, J. H., Ehsasi, M., & Gorodetskii, V. (1993). Dynamic studies of surface reactions with microscopic techniques. Progress in Surface Science, 1-4(42), 143-168. doi:10.1016/0079-6816(93)90067-6.

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 Creators:
Block, Jochen H.1, Author           
Ehsasi, Mohammad1, Author           
Gorodetskii, Vladimir2, Author
Affiliations:
1Fritz Haber Institute, Max Planck Society, ou_24021              
2Boreskov Institute of Catalysis of the Siberian Branch of Russia Academy of Sciences, Novosibirsk, Russia, ou_persistent22              

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 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.

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Language(s): eng - English
 Dates: 1993-04-01
 Publication Status: Issued
 Pages: 26
 Publishing info: -
 Table of Contents: -
 Rev. Type: Peer
 Identifiers: DOI: 10.1016/0079-6816(93)90067-6
 Degree: -

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Title: Progress in Surface Science
  Abbreviation : Progr. Surf. Sci.
Source Genre: Journal
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Publ. Info: Amsterdam : Elsevier
Pages: 26 Volume / Issue: 1-4 (42) Sequence Number: - Start / End Page: 143 - 168 Identifier: ISSN: 0079-6816
CoNE: https://pure.mpg.de/cone/journals/resource/954925460091