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  Adsorbate mobilities on catalyst nanoparticles studied via the angular distribution of desorbing products

Johánek, V., Laurin, M., Hoffmann, J., Schauermann, S., Grant, A. W., Kasemo, B., et al. (2004). Adsorbate mobilities on catalyst nanoparticles studied via the angular distribution of desorbing products. Surface science, 561(2-3), L218-L224. doi:10.1016/j.susc.2004.05.069.

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Item Permalink: http://hdl.handle.net/11858/00-001M-0000-0011-0BA0-1 Version Permalink: http://hdl.handle.net/11858/00-001M-0000-0011-0BA2-E
Genre: Journal Article

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 Creators:
Johánek, Viktor1, Author              
Laurin, Mathias1, Author              
Hoffmann, Jens1, Author              
Schauermann, Swetlana1, Author              
Grant, Ann W., Author
Kasemo, Bengt, Author
Libuda, Jörg1, Author              
Freund, Hans-Joachim1, Author              
Affiliations:
1Chemical Physics, Fritz Haber Institute, Max Planck Society, ou_24022              

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Free keywords: Catalysis; Surface diffusion; Palladium; Carbon monoxide; Oxidation
 Abstract: Employing molecular beam methods, we have studied the angular distribution of products desorbing from oxide-supported Pd nanoparticles during catalytic oxidation of CO. A large range of particle sizes was covered by combining preparation techniques based on (1) metal evaporation and growth and (2) electron beam lithography. Whereas the CO2 distribution is symmetric and independent of the reaction conditions on small Pd aggregates, a strong influence of the reactant incidence angles and fluxes was observed for large particles. For the first time, these observations experimentally verify the existence of local reaction rate variations on a catalyst nanoparticle as a consequence of limited adsorbate mobility. Furthermore, the results allow us to extract in situ information about surface diffusion rates.

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Title: Surface science
  Abbreviation : Surf. Sci.
Source Genre: Journal
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Publ. Info: Amsterdam : Elsevier
Pages: - Volume / Issue: 561 (2-3) Sequence Number: - Start / End Page: L218 - L224 Identifier: Other: 0039-6028
CoNE: /journals/resource/0039-6028