Structure sensitivity of selective acetylene hydrogenation over the catalysts with shape-controlled palladium nanoparticles

Détails

ID Serval
serval:BIB_D8D2DDB06931
Type
Article: article d'un périodique ou d'un magazine.
Collection
Publications
Titre
Structure sensitivity of selective acetylene hydrogenation over the catalysts with shape-controlled palladium nanoparticles
Périodique
Kinetics and Catalysis
Auteur(s)
Yarulin A. E., Crespo-Quesada R. M., Egorova E. V., Minsker L. L. Kiwi
ISSN
1608-3210
0023-1584
Statut éditorial
Publié
Date de publication
04/2012
Peer-reviewed
Oui
Volume
53
Numéro
2
Pages
253-261
Langue
anglais
Résumé
The structure sensitivity of acetylene hydrogenation on catalysts with controlled shape of palladium nanoparticles was studied. Palladium particles of cubic (Pdcub), cuboctahedral (Pdco) and octahedral (Pdoct) shapes were obtained by a colloidal method. Poly(N-vinyl)pyrrolidone (PVP) was used as the stabilizer of colloidal solutions. In order to eliminate the effect of the polymer on the properties of the catalyst, PVP was removed from the surface of the particles after their transfer to the support by simultaneous treatment with ozone and UV radiation. This allowed complete cleaning of the catalyst surface from the organic stabilizer without any change in the morphology of particles. The effectiveness of this treatment method was confirmed by X-ray photoelectron spectroscopy and scanning electron microscopy. It was found experimentally that the shape of nanoparticles does not influence the catalyst selectivity, but the activity decreases in the order Pdoct > Pdco > Pdcub. Since octahedrons consist of (111) faces, the cubes contain only (100) faces, and the cuboctahedrons are composed of faces of both types, Pd111 is more active than Pd100. Calculations with the use of a statistical method showed that the ∼3-nm Pd octahedrons are nanoparticles with optimum shape and size, giving maximum catalyst activity.
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Création de la notice
12/12/2017 15:49
Dernière modification de la notice
29/03/2018 9:04
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