Size and shape-controlled Pd nanocrystals on ZnO and SiO2: When the nature of the support determines the active phase

Détails

Ressource 1Télécharger: Crespo-ChemCatChem-2014-AAM.pdf (974.63 [Ko])
Etat: Public
Version: Author's accepted manuscript
ID Serval
serval:BIB_3F2FDE073C5D
Type
Article: article d'un périodique ou d'un magazine.
Collection
Publications
Titre
Size and shape-controlled Pd nanocrystals on ZnO and SiO2: When the nature of the support determines the active phase
Périodique
ChemCatChem
Auteur(s)
Crespo-Quesada M., Yoon S., Jin M., Xia Y., Weidenkaff A., Kiwi-Minsker L.
Statut éditorial
Publié
Date de publication
01/03/2014
Peer-reviewed
Oui
Volume
6
Numéro
3
Pages
767-771
Langue
anglais
Résumé
The structure sensitivity of acetylene hydrogenation was studied over size-controlled cubic and octahedral Pd nanocrystals (NCs) supported on ZnO and SiO2. Acetylene hydrogenation was found to be structure sensitive [with Pd(1 1 1) in octahedra being more active than Pd(1 0 0) in cubes]. However, the response was found to vary depending on the redox properties of the support. The catalytically active and selective palladium carbide (PdCx) phase was readily formed on the SiO2-supported Pd NCs (much faster on cubes than on octahedra), whereas a markedly less active PdZn phase was preferentially formed on the ZnO-supported Pd nanocrystals. Here we show that the structure sensitivity of a chemical reaction is a complex phenomenon that originates from the reconstruction of the active phase in response to the reactive environment, which is ultimately determined by the support used.
Création de la notice
12/12/2017 15:49
Dernière modification de la notice
20/08/2019 14:36
Données d'usage