Chemically resolved dynamical imaging of catalytic reactions on composite surfaces

Publikation: Beitrag in Fachzeitschrift › Artikel › Forschung › Peer-Review

Autoren

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

Organisationseinheiten

Externe Organisationen

  • Sincrotrone Trieste
  • Princeton University
Forschungs-netzwerk anzeigen

Details

OriginalspracheEnglisch
Seiten (von - bis)85-90
Seitenumfang6
FachzeitschriftCatalysis letters
Jahrgang52
Ausgabenummer1
PublikationsstatusVeröffentlicht - Juni 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.

ASJC Scopus Sachgebiete

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Chemically resolved dynamical imaging of catalytic reactions on composite surfaces. / Esch, F.; Günther, S.; Schütz, E. et al.
in: Catalysis letters, Jahrgang 52, Nr. 1, 06.1998, S. 85-90.

Publikation: Beitrag in Fachzeitschrift › Artikel › Forschung › 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, Jg. 52, Nr. 1, S. 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 ; Jahrgang 52, Nr. 1. S. 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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