Article (Scientific journals)
Nucleation phenomenon in silica xerogels and Pd/SiO2, Ag/SiO2, Cu/SiO2 cogelled catalysts
Alié, Christelle; Lambert, Stéphanie; Heinrichs, Benoît et al.
2003In Journal of Sol-Gel Science and Technology, 26 (1-3), p. 827-830
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Keywords :
sol-gel process; low-density xerogel; cogelled catalysts; nucleation; metal dispersion
Abstract :
[en] Pd/SiO2, Ag/SiO2 and Cu/SiO2 xerogel catalysts have been synthesized by cogelation of tetraethoxysilane (TEOS) and chelates of Pd, Ag and Cu with 3-(2-aminoethylamino) propyltrimethoxysilane (EDAS). It appears that, in cogelled samples, the metal complex acts as a nucleation agent in the formation of silica particles. The resulting catalysts are then composed of completely accessible metallic crystallites with a diameter of about 3 nm located inside silica porous particles with a monodisperse microporous distribution. Xerogels without metal synthesized with EDAS and TEOS (C. Alie, R. Pirard, A. J. Lecloux, and J.-P. Pirard, J. Non-Cryst. Solids 289, 88 (2001)) verify this hypothesis of nucleation by EDAS.
Disciplines :
Chemical engineering
Materials science & engineering
Author, co-author :
Alié, Christelle ;  Université de Liège - ULiège > Chimie appliquée > Chimie physique appliquée
Lambert, Stéphanie  ;  Université de Liège - ULiège > Département de chimie appliquée > Génie chimique - Génie catalytique
Heinrichs, Benoît ;  Université de Liège - ULiège > Département de chimie appliquée > Ingén. des nanomatériaux, des matér. divisés et des interf.
Pirard, Jean-Paul ;  Université de Liège - ULiège > Département de chimie appliquée > Génie chimique - Génie catalytique
Language :
English
Title :
Nucleation phenomenon in silica xerogels and Pd/SiO2, Ag/SiO2, Cu/SiO2 cogelled catalysts
Publication date :
2003
Journal title :
Journal of Sol-Gel Science and Technology
ISSN :
0928-0707
eISSN :
1573-4846
Publisher :
Kluwer Academic Publ, Dordrecht, Netherlands
Volume :
26
Issue :
1-3
Pages :
827-830
Peer reviewed :
Peer Reviewed verified by ORBi
Funders :
F.R.S.-FNRS - Fonds de la Recherche Scientifique [BE]
Available on ORBi :
since 23 March 2009

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