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  The Effect of Polarization and Reaction Mixture on the Rh/YSZ Oxidation State During Ethylene Oxidation Studied by Near Ambient Pressure XPS

Katsaounis, A., Teschner, D., & Zafeiratos, S. (2018). The Effect of Polarization and Reaction Mixture on the Rh/YSZ Oxidation State During Ethylene Oxidation Studied by Near Ambient Pressure XPS. Topics in Catalysis, 61(20), 2142-2151. doi:10.1007/s11244-018-1073-4.

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Katsaounis, A.1, Author
Teschner, Detre2, 3, Author           
Zafeiratos, Spiros4, Author
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1Department of Chemical Engineering, University of Patras, GR26504 Patras, Greece, ou_persistent22              
2Inorganic Chemistry, Fritz Haber Institute, Max Planck Society, ou_24023              
3Department of Heterogeneous Reactions, Max-Planck-Institute for Chemical Energy Conversion, ou_persistent22              
4Institut de Chimie et Procédés pour l’Energie, l’Environnement et la Santé (ICPEES), ECPM, UMR 7515 CNRS-Université de Strasbourg, 25, rue Becquerel, 67087 Strasbourg Cedex 02, France, ou_persistent22              

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 Abstract: In this study, near ambient pressure X-ray photoelectron spectroscopy (NAP-XPS) is applied to investigate an electrochemical cell consisting of a rhodium thin film catalyst supported on an yttria-stabilized zirconia (YSZ) solid electrolyte under various ethylene-oxygen reaction mixtures. The aim of the study is twofold: first to show how the surface oxidation state of the Rh catalyst is correlated with the reactants feed composition and the temperature, and second, to reveal the effect of the anodic polarization on the stability of Rh oxides and the implications on the electrochemical promotion of catalysis. It is clearly shown that even under reducing conditions part of the Rh electrode remains oxidized at temperatures up to 250 °C. <br>Reduction of the oxide can take place by increasing the temperature under <br>C<sub>2</sub>H<sub>4</sub> excess, something which is not happening under oxidizing reaction mixtures. Moreover, anodic polarization, i.e. oxygen ion supply to the surface, facilitates reduction of oxidized Rh electrodes over a broad range of ethylene–oxygen reaction mixtures. Remarkably, under mildly reducing <br>conditions a stable ultrathin Rh surface oxide film forms over metallic Rh. This surface Rh oxide film (RhO<sub>x<sub>) is associated <br>to higher cell currents, counterintuitive to the case of bulk Rh oxides (Rh<sub>2</sub>O<sub>3</sub>).

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Language(s): eng - English
 Dates: 2018-10-242018-12
 Publication Status: Issued
 Pages: 10
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 Rev. Type: Peer
 Identifiers: DOI: 10.1007/s11244-018-1073-4
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Title: Topics in Catalysis
  Other : Top. Catal.
Source Genre: Journal
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Publ. Info: New York : Springer
Pages: 10 Volume / Issue: 61 (20) Sequence Number: - Start / End Page: 2142 - 2151 Identifier: ISSN: 1022-5528
CoNE: https://pure.mpg.de/cone/journals/resource/954925584249