Pd(111) versus Pd-Au(111) in carbon monoxide oxidation under elevated pressures

Pd(111) versus Pd-Au(111) in carbon monoxide oxidation under elevated pressures

The oxidation of CO on Pd(111) and Pd70Au30(111) has been studied under pressures upto 100 Torr. Gold is found to decrease the surface activity by inhibiting oxygen dissociation. For a sufficient conversion time depending on the CO coverage and the surface identity, a dramatic boost of activity occu...

Ausführliche Beschreibung

Gespeichert in:
Bibliographische Detailangaben
Veröffentlicht in:Catalysis letters 2007-03, Vol.114 (1-2), p.110-114
Hauptverfasser: PIEDNOIR, A, LANGUILLE, M. A, PICCOLO, L, VALCARCEL, A, CADETE SANTOS. AIRES, F. J, BERTOLINI, J. C
Format: Artikel
Sprache:eng
Schlagworte:
Adsorption
Carbon monoxide
Catalysis
Chemical Sciences
Chemistry
Environment and Society
Environmental Sciences
Exact sciences and technology
General and physical chemistry
Gold
Oxidation
Palladium
Surface chemistry
Theory of reactions, general kinetics. Catalysis. Nomenclature, chemical documentation, computer chemistry
Online-Zugang:Volltext
Tags: Tag hinzufügen
Keine Tags, Fügen Sie den ersten Tag hinzu!
Beschreibung
Zusammenfassung:The oxidation of CO on Pd(111) and Pd70Au30(111) has been studied under pressures upto 100 Torr. Gold is found to decrease the surface activity by inhibiting oxygen dissociation. For a sufficient conversion time depending on the CO coverage and the surface identity, a dramatic boost of activity occurs. This is ascribed to a switch from CO-induced inhibition of O2 adsorption to a regime determined by CO adsorption. The other kinetic features are explained by oxidation of palladium and adsorption-induced restructuring of the surfaces.
ISSN:1011-372X
1572-879X
DOI:10.1007/s10562-007-9047-3