Deutsch
 
Hilfe Datenschutzhinweis Impressum
  DetailsucheBrowse
  1. Datensatz ansehen / 
  2. Datensatz Übersicht

Datensatz

DATENSATZ AKTIONENEXPORT
Zur Ablage hinzufügen
  Lokale TagsFreigabegeschichteDetailsÜbersicht

Freigegeben
Zeitschriftenartikel

IR spectroscopic investigations during oscillations of the CO/NO and the CO/O2 reaction on Pt and Pd catalysts I: Platinum

MPG-Autoren
Es sind keine MPG-Autoren in der Publikation vorhanden
Externe Ressourcen
Es sind keine externen Ressourcen hinterlegt
Volltexte (beschränkter Zugriff)
Für Ihren IP-Bereich sind aktuell keine Volltexte freigegeben.
Volltexte (frei zugänglich)
Es sind keine frei zugänglichen Volltexte in PuRe verfügbar
Ergänzendes Material (frei zugänglich)
Es sind keine frei zugänglichen Ergänzenden Materialien verfügbar
Zitation

Schüth, F., & Wicke, E. (1989). IR spectroscopic investigations during oscillations of the CO/NO and the CO/O2 reaction on Pt and Pd catalysts I: Platinum. Berichte der Bunsen-Gesellschaft für Physikalische Chemie, 93(2), 191-201. doi:10.1002/bbpc.19890930217.


Zitierlink: https://hdl.handle.net/11858/00-001M-0000-0024-3E57-1
Zusammenfassung
The CO/NO reaction on Platinum supported catalysts exhibits oscillatory behaviour at temperatures between 650 and 750 K and NO/CO ratios between 0.8 and 4. The oscillations are accompanied with large temperature variations which seem to be necessary to synchronize the instabilities at different crystallites. IR spectroscopic investigations reveal appreciable shifts of the position of the L-CO band on Pt. This leads to a model involving the hex ⇄ 1 × 1 surface transformation of the Pt(100) plane as the crucial step during an oscillation cycle. A comparison with results of other groups confirms this proposition. Concerning the CO/O2 reaction, however, no indication for the applicability of the hex ⇄ 1 × 1 model for oscillations at atmospheric pressures could be found by means of IR spectroscopy. Also oxidation-reduction models could be excluded. The only mechanism discussed in the literature which is in agreement with our findings explains the oscillations by reversible microfacetting of the Pt(110) plane.