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  Reactivity of Ultra-Thin ZnO Films Supported by Ag(111) and Cu(111): A Comparison to ZnO/Pt(111)

Pan, Q., Liu, B. H., McBriarty, M., Martynova, Y., Groot, I., Wang, S., et al. (2014). Reactivity of Ultra-Thin ZnO Films Supported by Ag(111) and Cu(111): A Comparison to ZnO/Pt(111). Catalysis Letters, 144(4), 648-655. doi:10.1007/s10562-014-1191-y.

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 Creators:
Pan, Qiushi1, 2, Author           
Liu, Bo Hong1, Author           
McBriarty, Martin1, 3, Author           
Martynova, Yulia1, Author           
Groot, Irene1, Author           
Wang, S.2, Author
Bedzyk, M. J.3, Author
Shaikhutdinov, Shamil K.1, Author           
Freund, Hans-Joachim1, Author           
Affiliations:
1Chemical Physics, Fritz Haber Institute, Max Planck Society, ou_24022              
2Dalian National Laboratory for Clean Energy, Dalian Institute of Chemical Physics, Chinese Academy of Science, Dalian, 116023, Liaoning, China , ou_persistent22              
3Department of Materials Science and Engineering, Northwestern University, 2220 Campus Drive, Evanston, IL, 60208-3108, USA , ou_persistent22              

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Free keywords: Thin oxide films Zinc oxide Inverse catalysts CO oxidation
 Abstract: We studied structure and reactivity of ZnO(0001) ultrathin films grown on Ag(111) and Cu(111) single crystal surfaces. Structural characterization was carried out by scanning tunneling microscopy, Auger electron spectroscopy, low-energy electron diffraction, and temperature programmed desorption. The CO oxidation behavior of the films was studied at low temperature (450 K) at near atmospheric pressures using gas chromatography. For ZnO/Cu(111), it is shown that under reaction conditions ZnO readily migrates into the Cu crystal bulk, and the reactivity is governed by a CuOx oxide film formed in the reaction ambient. In contrast, the planar structure of ZnO films on Ag(111) is maintained, similarly to the previously studied ZnO films on Pt(111). At sub-monolayer coverages, the “inverse” model catalysts are represented by two-monolayer-thick ZnO(0001) islands on Pt(111) and Ag(111) supports. While the CO oxidation rate is considerably increased on ZnO/Pt(111), which is attributed to active sites at the metal/oxide boundary, sub-monolayer ZnO films on Ag(111) did not show such an effect, and the reactivity was inhibited with increasing film coverage. The results are explained by much stronger adsorption of CO on Pt(111) as compared with Ag(111) in proximity to O species at the oxide/metal boundary. In addition, the water–gas shift and reverse water–gas shift reactions were examined on ZnO/Ag(111), which revealed no promotional effect of ZnO on the reactivity of Ag under the conditions studied. The latter finding suggests that wetting phenomena of ZnO on metals does not play a crucial role in the catalytic performance of ZnO-based real catalysts in those reactions.

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Language(s): eng - English
 Dates: 2013-11-152013-12-272014-02-052014-04-01
 Publication Status: Published in print
 Pages: 8
 Publishing info: -
 Table of Contents: -
 Rev. Type: Peer
 Identifiers: DOI: 10.1007/s10562-014-1191-y
 Degree: -

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Title: Catalysis Letters
Source Genre: Journal
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Publ. Info: New York : Springer
Pages: - Volume / Issue: 144 (4) Sequence Number: - Start / End Page: 648 - 655 Identifier: ISSN: 1011-372X
CoNE: https://pure.mpg.de/cone/journals/resource/954925586300