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  Structure and reactivity of iron oxide surfaces

Shaikhutdinov, S. K., Joseph, Y., Kuhrs, C., Ranke, W., & Weiss, W. (1999). Structure and reactivity of iron oxide surfaces. Faraday Discussions, 114, 363-380. doi:10.1039/A902633I.

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FHIAC_SJK99_Shaikhutdinov_structure_react_Fe_ox.pdf (Any fulltext), 963KB
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FHIAC_SJK99_Shaikhutdinov_structure_react_Fe_ox.pdf
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1999
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 Creators:
Shaikhutdinov, Shamil K.1, Author              
Joseph, Yvonne2, Author              
Kuhrs, Christian2, Author              
Ranke, Wolfgang2, Author              
Weiss, Werner2, Author              
Affiliations:
1Chemical Physics, Fritz Haber Institute, Max Planck Society, ou_24022              
2Inorganic Chemistry, Fritz Haber Institute, Max Planck Society, ou_24023              

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Free keywords: 19; iron oxide model catalysts: adsorption and catalysis
 Abstract: Epitaxial films of different iron oxide phases and of potassium iron oxide were grown onto Pt(111) substrates and used for studying structure-reactivity correlations. The film morphologies and their atomic surface structures were characterized by scanning tunneling microscopy and low energy electron diffraction including multiple scattering calculations. The adsorption of water, ethylbenzene, and styrene was investigated by temperature programmed desorption and photoelectron spectroscopy. A dissociative chemisorption of water and a molecular chemisorption of ethylbenzene and styrene is observed on all oxides that expose metal cations in their topmost layers, whereas purely oxygen terminated FeO(111) monolayer films are chemically inert and only physisorption occurs. Regarding the technical styrene synthesis reaction which is performed over iron oxide based catalysts, we find a decreasing chemisorption strength of the reaction product molecule styrene if compared to ethylbenzene when going from Fe3O4(111) over a-Fe2O3(0001) to KFexOy(111). Extrapolation of the adsorbate coverages to the technical styrene synthesis reaction conditions using the Langmuir isotherm for coadsorption suggests an increasing catalytic activity along the same direction. This result agrees with previous kinetic experiments performed at elevated gas pressures over the model systems studied here and over polycrystalline iron oxide catalyst samples. It indicates that the iron oxide surface chemistry does not change across the pressure-gap and that the model systems simulate technical styrene synthesis catalysts in a realistic way

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Language(s): eng - English
 Dates: 1999-04-011999
 Publication Status: Published in print
 Pages: 18
 Publishing info: -
 Table of Contents: -
 Rev. Type: Peer
 Identifiers: eDoc: 1207
DOI: 10.1039/A902633I
 Degree: -

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Title: Faraday Discussions
Source Genre: Journal
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Publ. Info: London : Royal Society of Chemistry
Pages: 18 Volume / Issue: 114 Sequence Number: - Start / End Page: 363 - 380 Identifier: ISSN: 1359-6640
CoNE: https://pure.mpg.de/cone/journals/resource/954925269326