[en] Pt/C catalysts were prepared by impregnation of carbon xerogels with H2PtCl6 aqueous solutions. Three supports with various pore textures were used: two micro-mesoporous (maximum pore size = 10 and 40 nm, respectively) and one micro-macroporous (maximum pore size = 70 nm). After impregnation, drying and reduction, the metal particles were at most 1-1.5 nm in diameter. The Pt dispersion was close to 100% in the case of the xerogel with large mesopores. For the two other supports, a small fraction of Pt was trapped in blocked micropores. The specific catalytic activity obtained for benzene hydrogenation was 4-10 times higher than that obtained with active charcoal-supported catalysts prepared by a similar method. The high dispersion of Pt was attributed to the presence in the xerogel of large mesopore or macropore volumes, which facilitates impregnation, and a low amount of oxygenated surface groups. (c) 2006 Elsevier Inc. All rights reserved.
Disciplines :
Chemical engineering Materials science & engineering
Author, co-author :
Job, Nathalie ; Université de Liège - ULiège > Département de chimie appliquée > Génie chimique - Chimie physique appliquée
Ribeiro Pereira, Manuel Fernando
Lambert, Stéphanie ; Université de Liège - ULiège > Département de chimie appliquée > Génie chimique - Génie catalytique
Cabiac, Amandine
Delahay, Gerard
Colomer, Jean-Francois
Marien, José ; Université de Liège - ULiège > Département de chimie appliquée > Chimie générale et chimie physique
Figueiredo, Jose Luis
Pirard, Jean-Paul ; Université de Liège - ULiège > Département de chimie appliquée > Génie chimique - Chimie physique appliquée
Language :
English
Title :
Highly dispersed platinum catalysts prepared by impregnation of texture-tailored carbon xerogels
Publication date :
2006
Journal title :
Journal of Catalysis
ISSN :
0021-9517
eISSN :
1090-2694
Publisher :
Academic Press, San Diego, United States - California
Volume :
240
Issue :
2
Pages :
160-171
Peer reviewed :
Peer Reviewed verified by ORBi
Funders :
F.R.S.-FNRS - Fonds de la Recherche Scientifique [BE]
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