Mass transport of alkali metal in reaction fronts on a catalytic metal surface

H. Marbach, M. Hinz, S. Günther, L. Gregoratti, M. Kiskinova, R. Imbihl

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23 Scopus citations

Abstract

The spatial distribution of potassium on a Rh(110) surface during the catalytic O2 + H2 reaction is investigated employing scanning photoelectron microscopy (SPEM) and photoelectron emission microscopy (PEEM) as spatially resolving in situ methods. Mass transport of potassium with the reaction fronts is observed leading to a slowing down of the fronts and to time-dependent concentration profiles. Differences in the mobility and in the bonding strength of potassium on the 'reduced' and on the oxygen covered surface are shown to be the key factors for the enrichment of potassium in the front region.

Original languageEnglish
Pages (from-to)207-212
Number of pages6
JournalChemical Physics Letters
Volume364
Issue number3-4
DOIs
StatePublished - 4 Oct 2002
Externally publishedYes

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