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  On the preparation and composition of potassium promoted iron oxide model catalyst films

Joseph, Y., Ketteler, G., Kuhrs, C., Ranke, W., Weiss, W., & Schlögl, R. (2001). On the preparation and composition of potassium promoted iron oxide model catalyst films. Physical Chemistry Chemical Physics, 3(18), 4141-4153. doi:10.1039/b104263g.

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 Creators:
Joseph, Yvonne1, Author              
Ketteler, Guido1, Author              
Kuhrs, Christian1, Author              
Ranke, Wolfgang1, Author              
Weiss, Werner1, Author              
Schlögl, Robert1, Author              
Affiliations:
1Inorganic Chemistry, Fritz Haber Institute, Max Planck Society, ou_24023              

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Free keywords: 18: Iron oxide model catalysts: preparation & characterization
 Abstract: Potassium promoted iron oxide model catalyst films were prepared by deposition of potassium onto epitaxial Fe3O4(111) films at 200 K, followed by annealing in the range 200 to 970 K. Their formation and composition was investigated by X-ray photoelectron spectroscopy (XPS) in combi-nation with thermal desorption spectroscopy (TDS) and thermodynamic considerations. Already at 300 K a solid-state reaction occurs and the iron oxide is partly reduced. Around 700 K a KFeO2 phase was identified which transformed at higher temperatures into KxFe22O34(0.67<x<4). This transformation started from the bulk of the film so that initially a potassium rich KFeO2 layer was formed on top of KxFe22O34. The forma-tion of a single-crystalline KxFe22O34 (x=0.67) layer, which is terminated by a submonolayer of potassium, is assumed to occur at 970 K. For a certain potassium content, this surface develops a well ordered phase with a (2x2) superstructure. The potassium containing phases are not stable in water atmosphere: In 10-8 mbar H2O, potassium hydroxide forms which decomposes and desorbs beyond 400-500K resulting in a potassium-depleted near-surface laye

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Language(s): eng - English
 Dates: 2001-07-152001-05-152001-07-172001-08-30
 Publication Status: Published in print
 Pages: 13
 Publishing info: -
 Table of Contents: -
 Rev. Type: Peer
 Identifiers: eDoc: 1214
DOI: 10.1039/b104263g
 Degree: -

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Title: Physical Chemistry Chemical Physics
  Abbreviation : Phys. Chem. Chem. Phys.
Source Genre: Journal
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Publ. Info: Cambridge, England : Royal Society of Chemistry
Pages: 13 Volume / Issue: 3 (18) Sequence Number: - Start / End Page: 4141 - 4153 Identifier: ISSN: 1463-9076
CoNE: https://pure.mpg.de/cone/journals/resource/954925272413_1