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  The role of exposed silver in CO oxidation over MgO(0 0 1)/Ag(0 0 1) thin films

Ringleb, F., Fujimori, Y., Brown, M. A., Kaden, W., Calaza, F., Kuhlenbeck, H., et al. (2015). The role of exposed silver in CO oxidation over MgO(0 0 1)/Ag(0 0 1) thin films. Catalysis Today, 240, Pt. B, 206-213. doi:10.1016/j.cattod.2014.04.025.

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CO oxidation on thin MgO films_final_Pubman.pdf (Any fulltext), 756KB
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 Creators:
Ringleb, Franziska1, Author              
Fujimori, Yuichi1, Author              
Brown, Matthew A.1, Author              
Kaden, William1, Author              
Calaza, Florencia1, Author              
Kuhlenbeck, Helmut1, Author              
Sterrer, Martin1, Author              
Freund, Hans-Joachim1, Author              
Affiliations:
1Chemical Physics, Fritz Haber Institute, Max Planck Society, ou_24022              

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Free keywords: Ultrathin films; Oxide surfaces; Reactivity; CO oxidation; Charge transfer
 Abstract: The reactivity of MgO(0 0 1) films deposited on Ag(0 0 1) and Mo(0 0 1) in CO oxidation as a function of oxide film thickness was investigated experimentally at ambient pressure reaction conditions. MgO films grown on Mo(0 0 1) were found to be inactive in CO oxidation, whereas activity enhancement with decreasing oxide film thickness was observed for MgO(0 0 1)/Ag(0 0 1). In situ infrared and post-reaction X-ray photoemission data showed that ultra-thin MgO films interact much more strongly with the reactants and residual water than bulk-like MgO. Poisoning of the MgO surfaces by the resultant accumulation of carbonate and hydroxyl species is suggested to inhibit the reactivity in CO oxidation. Detailed investigations of the surface structure of MgO(0 0 1)/Ag(0 0 1) films indicate that silver ad-islands on Ag(0 0 1), which are formed during MgO growth, are responsible for the enhancement of CO oxidation activity over ultrathin MgO(0 0 1)/Ag(0 0 1) films.

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Language(s): eng - English
 Dates: 2014-03-172014-04-152014-06-022015-02-01
 Publication Status: Published in print
 Pages: 8
 Publishing info: -
 Table of Contents: -
 Rev. Type: Peer
 Identifiers: DOI: 10.1016/j.cattod.2014.04.025
 Degree: -

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Title: Catalysis Today
Source Genre: Journal
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Publ. Info: Amsterdam : Elsevier
Pages: - Volume / Issue: 240, Pt. B Sequence Number: - Start / End Page: 206 - 213 Identifier: ISSN: 0920-5861
CoNE: https://pure.mpg.de/cone/journals/resource/954925564669