The dynamic of surface phenomena on a Pt(1%)/A12O3 catalyst for the reduction of NO by propene/O2 has been studied by in situ DRIFT experiments and parallel transient reactivity data using the RWF (Rectangular WaveFront) method. The results indicate that NO strongly chemisorbs over Pt oxidized surface and this inhibits Pt reactivity towards hydrocarbon oxidation, but then progressively migrates over alumina surface from which can desorb as NO2. At the temperature of maximum activity in the reduction of NO, the rate of migration is slow and thus the hydrocarbon reacts with the nitrogen oxide adsorbed species over the metal surface, whereas at higher temperature the rate of migration is faster leaving free oxidized metal surface for hydrocarbon combustion.

The surface migration of NOx adspecies as a factor determining the reactivity of supported Pt catalysts for the treatment of lean burn engine emissions

CENTI, Gabriele;
2000

Abstract

The dynamic of surface phenomena on a Pt(1%)/A12O3 catalyst for the reduction of NO by propene/O2 has been studied by in situ DRIFT experiments and parallel transient reactivity data using the RWF (Rectangular WaveFront) method. The results indicate that NO strongly chemisorbs over Pt oxidized surface and this inhibits Pt reactivity towards hydrocarbon oxidation, but then progressively migrates over alumina surface from which can desorb as NO2. At the temperature of maximum activity in the reduction of NO, the rate of migration is slow and thus the hydrocarbon reacts with the nitrogen oxide adsorbed species over the metal surface, whereas at higher temperature the rate of migration is faster leaving free oxidized metal surface for hydrocarbon combustion.
File in questo prodotto:
Non ci sono file associati a questo prodotto.
Pubblicazioni consigliate

Caricamento pubblicazioni consigliate

I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.

Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/11570/1583969
 Attenzione

Attenzione! I dati visualizzati non sono stati sottoposti a validazione da parte dell'ateneo

Citazioni
  • ???jsp.display-item.citation.pmc??? ND
  • Scopus 2
  • ???jsp.display-item.citation.isi??? ND
social impact