Reactive Phase Separation during Methanol Oxidation on a V-Oxide-Promoted Rh(110) Surface

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Authors

  • Bernhard Von Boehn
  • Tevfik O. Menteş
  • Andrea Locatelli
  • Alessandro Sala
  • Ronald Imbihl

External Research Organisations

  • Sincrotrone Trieste
  • Istituto Nazionale di Fisica Nucleare (INFN)
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Details

Original languageEnglish
Pages (from-to)10482-10488
Number of pages7
JournalJournal of Physical Chemistry C
Volume122
Issue number19
Early online date25 Apr 2018
Publication statusPublished - 17 May 2018

Abstract

The distribution of ultrathin layers of vanadium oxide on Rh(110) (θV ≤ 1 MLE, one monolayer equivalent corresponds to the number of Rh atoms in the topmost Rh(110) surface layer) after exposure to catalytic methanol oxidation in the 10-4 mbar range has been investigated with x-ray photoelectron spectroscopy and spectroscopic low-energy electron microscopy (SPELEEM). The reaction is shown to cause a macroscopic phase separation of the VOx film into VOx-rich and into V-poor phases. For θV = 0.8 MLE compact VOx islands develop whose substructure exhibits several ordered phases. At θV = 0.4 MLE the VOx-rich phase consists of many small VOx islands (0.1-1 μm). Laterally resolved x-ray photoelectron spectroscopy of V 2p3/2 shows an oxidic component at 515.5 eV binding energy (BE) and a component at 513.0 eV BE attributed to metallic or strongly reduced V. On the V-poor phase only the reduced/metallic component is present. The results are compared with the distribution of ultrathin layers of vanadium oxide on Rh(111) after catalytic methanol oxidation. The presence of the metallic V on Rh(110) is at variance with the behavior of Rh(111), where V is found to be present only in high oxidation states during methanol oxidation.

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Cite this

Reactive Phase Separation during Methanol Oxidation on a V-Oxide-Promoted Rh(110) Surface. / Von Boehn, Bernhard; Menteş, Tevfik O.; Locatelli, Andrea et al.
In: Journal of Physical Chemistry C, Vol. 122, No. 19, 17.05.2018, p. 10482-10488.

Research output: Contribution to journalArticleResearchpeer review

Von Boehn, B, Menteş, TO, Locatelli, A, Sala, A & Imbihl, R 2018, 'Reactive Phase Separation during Methanol Oxidation on a V-Oxide-Promoted Rh(110) Surface', Journal of Physical Chemistry C, vol. 122, no. 19, pp. 10482-10488. https://doi.org/10.1021/acs.jpcc.8b02544
Von Boehn B, Menteş TO, Locatelli A, Sala A, Imbihl R. Reactive Phase Separation during Methanol Oxidation on a V-Oxide-Promoted Rh(110) Surface. Journal of Physical Chemistry C. 2018 May 17;122(19):10482-10488. Epub 2018 Apr 25. doi: 10.1021/acs.jpcc.8b02544
Von Boehn, Bernhard ; Menteş, Tevfik O. ; Locatelli, Andrea et al. / Reactive Phase Separation during Methanol Oxidation on a V-Oxide-Promoted Rh(110) Surface. In: Journal of Physical Chemistry C. 2018 ; Vol. 122, No. 19. pp. 10482-10488.
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AU - Von Boehn, Bernhard

AU - Menteş, Tevfik O.

AU - Locatelli, Andrea

AU - Sala, Alessandro

AU - Imbihl, Ronald

N1 - Publisher Copyright: © 2018 American Chemical Society. Copyright: Copyright 2018 Elsevier B.V., All rights reserved.

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