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  Size effect in two-dimensional oxide-on-metal catalysts of CO oxidation and its connection to oxygen bonding: An experimental and theoretical approach

Zhang, K., Li, L., Goniakowski, J., Noguera, C., Freund, H.-J., & Shaikhutdinov, S. K. (2021). Size effect in two-dimensional oxide-on-metal catalysts of CO oxidation and its connection to oxygen bonding: An experimental and theoretical approach. Journal of Catalysis, 393, 100-106. doi:10.1016/j.jcat.2020.11.022.

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Size effect FeO Pt revised.pdf (Any fulltext), 2MB
 
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 Creators:
Zhang, Ke1, Author              
Li, Linfei1, Author              
Goniakowski, Jacek2, Author
Noguera, Claudine2, Author
Freund, Hans-Joachim1, Author              
Shaikhutdinov, Shamil K.1, Author              
Affiliations:
1Chemical Physics, Fritz Haber Institute, Max Planck Society, ou_24022              
2CNRS-Sorbonne Université, UMR 7588, Institut des Nanosciences de Paris, 4 Place Jussieu, 75005 Paris, France, ou_persistent22              

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 Abstract: Transition metal oxide layers on metal surfaces often show superior catalytic performance as compared to conventional, i.e., metal-on-oxide, systems. In this work, we studied the CO oxidation reaction over FeO supported by Pt(1 1 1) and observed strong size effects on the reactivity. The monolayer islands below 5 nm in size showed a light-off temperature for CO2 production 200 K lower than for the 30 nm islands. In an attempt to rationalize the size effect, we have performed oxygen desorption experiments and have combined them with an extended DFT analysis to provide insight into the bonding of various oxygen species in such systems. The theoretical results on isolated FeO2 islands indicate a substantially lower stability of the boundary oxygen atoms as compared with the same islands embedded into an FeO layer in qualitative agreement with experiment showing that the smaller the island, the lower the desorption temperature. To the best of our knowledge, the results demonstrate the first example of a size effect in oxidation catalysis on two-dimensional systems.

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Language(s): eng - English
 Dates: 2020-09-302020-11-122020-12-052021-01
 Publication Status: Published in print
 Pages: 7
 Publishing info: -
 Table of Contents: -
 Rev. Type: Peer
 Identifiers: DOI: 10.1016/j.jcat.2020.11.022
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Title: Journal of Catalysis
  Abbreviation : J. Catal.
Source Genre: Journal
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Publ. Info: Amsterdam : Elsevier
Pages: 7 Volume / Issue: 393 Sequence Number: - Start / End Page: 100 - 106 Identifier: ISSN: 0021-9517
CoNE: https://pure.mpg.de/cone/journals/resource/954922645027