Chemically resolved dynamical imaging of catalytic reactions on composite surfaces

Research output: Contribution to journal › Article › Research › peer review

Authors

  • F. Esch
  • S. Günther
  • E. Schütz
  • A. Schaak
  • I. G. Kevrekidis
  • M. Marsi
  • M. Kiskinova
  • R. Imbihl

Research Organisations

External Research Organisations

  • Sincrotrone Trieste
  • Princeton University
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Details

Original languageEnglish
Pages (from-to)85-90
Number of pages6
JournalCatalysis letters
Volume52
Issue number1
Publication statusPublished - Jun 1998

Abstract

The catalytic reduction of NO by hydrogen is investigated at T = 650 K and p ≈ 10-6 CT mbar on a microstructured Rh/Pt(100) surface consisting of Pt(100) domains surrounded by a 600 Å thick Rh film. Synchrotron radiation scanning photoemission microcopy (SPEM), using photons focused into a spot of less then 0.2 μm diameter, is employed as a spatially and chemically resolving in situ technique. The chemical wave, which arise in the bistable system NO + H2/Rh are imaged with SPEM monitoring the N 1s and O 1s photoelectrons. The reaction fronts initiate transitions from an inactive oxygen-covered surface (ΘO ≈ 0.25 ML) to a reactive nitroeen-covered surface (ΘN ≈ 0.06 ML) At the Pt/Rh interface, synergetic effects can be observed: the chemical waves on the Rh film nucleate preferentially at the Pt/Rh interface. This nucleation is poisoned by carbon contamination on the Pt area but is prevented in the vicinity of the Pt/Rh interface by the adjacent clean Rh film. No segregation of Pt to the surface was observed for the 600 Å thick Rh film.

Keywords

    Chemical waves, Dynamical imaging, Microstructured composite surfaces, NO reduction, PEEM, Photoemission electron microscopy, Pt, Rh, Scanning photoemission microscopy, SPEM

ASJC Scopus subject areas

Cite this

Chemically resolved dynamical imaging of catalytic reactions on composite surfaces. / Esch, F.; Günther, S.; Schütz, E. et al.
In: Catalysis letters, Vol. 52, No. 1, 06.1998, p. 85-90.

Research output: Contribution to journal › Article › Research › peer review

Esch, F, Günther, S, Schütz, E, Schaak, A, Kevrekidis, IG, Marsi, M, Kiskinova, M & Imbihl, R 1998, 'Chemically resolved dynamical imaging of catalytic reactions on composite surfaces', Catalysis letters, vol. 52, no. 1, pp. 85-90. https://doi.org/10.1023/a:1019015302467
Esch, F., Günther, S., Schütz, E., Schaak, A., Kevrekidis, I. G., Marsi, M., Kiskinova, M., & Imbihl, R. (1998). Chemically resolved dynamical imaging of catalytic reactions on composite surfaces. Catalysis letters, 52(1), 85-90. https://doi.org/10.1023/a:1019015302467
Esch F, Günther S, Schütz E, Schaak A, Kevrekidis IG, Marsi M et al. Chemically resolved dynamical imaging of catalytic reactions on composite surfaces. Catalysis letters. 1998 Jun;52(1):85-90. doi: 10.1023/a:1019015302467
Esch, F. ; Günther, S. ; Schütz, E. et al. / Chemically resolved dynamical imaging of catalytic reactions on composite surfaces. In: Catalysis letters. 1998 ; Vol. 52, No. 1. pp. 85-90.
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abstract = "The catalytic reduction of NO by hydrogen is investigated at T = 650 K and p ≈ 10-6 CT mbar on a microstructured Rh/Pt(100) surface consisting of Pt(100) domains surrounded by a 600 {\AA} thick Rh film. Synchrotron radiation scanning photoemission microcopy (SPEM), using photons focused into a spot of less then 0.2 μm diameter, is employed as a spatially and chemically resolving in situ technique. The chemical wave, which arise in the bistable system NO + H2/Rh are imaged with SPEM monitoring the N 1s and O 1s photoelectrons. The reaction fronts initiate transitions from an inactive oxygen-covered surface (ΘO ≈ 0.25 ML) to a reactive nitroeen-covered surface (ΘN ≈ 0.06 ML) At the Pt/Rh interface, synergetic effects can be observed: the chemical waves on the Rh film nucleate preferentially at the Pt/Rh interface. This nucleation is poisoned by carbon contamination on the Pt area but is prevented in the vicinity of the Pt/Rh interface by the adjacent clean Rh film. No segregation of Pt to the surface was observed for the 600 {\AA} thick Rh film.",
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AU - Esch, F.

AU - Günther, S.

AU - Schütz, E.

AU - Schaak, A.

AU - Kevrekidis, I. G.

AU - Marsi, M.

AU - Kiskinova, M.

AU - Imbihl, R.

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