ORBi: Alié Christelle - Nucleation phenomenon in silica xerogels and Pd/SiO2, Ag/SiO2, Cu/SiO2 cogelled catalysts

Reference : Nucleation phenomenon in silica xerogels and Pd/SiO2, Ag/SiO2, Cu/SiO2 cogelled catalysts


	Document type :	Scientific journals : Article
	Discipline(s) :	Engineering, computing & technology : Chemical engineering Engineering, computing & technology : Materials science & engineering
	To cite this reference:	http://hdl.handle.net/2268/9428

Title :	Nucleation phenomenon in silica xerogels and Pd/SiO2, Ag/SiO2, Cu/SiO2 cogelled catalysts
Language :	English
Author, co-author :	Alié, Christelle [Université de Liège - ULg > Chimie appliquée > Chimie physique appliquée > >]
	Lambert, Stéphanie [Université de Liège - ULg > Département de chimie appliquée > Génie chimique - Génie catalytique >]
	Heinrichs, Benoît [Université de Liège - ULg > Département de chimie appliquée > Ingén. des nanomatériaux, des matér. divisés et des interf. >]
	Pirard, Jean-Paul [Université de Liège - ULg > Département de chimie appliquée > Génie chimique - Génie catalytique >]
Publication date :	2003
Journal title :	Journal of Sol-Gel Science and Technology
Publisher :	Kluwer Academic Publ
Volume :	26
Issue/season :	1-3
Pages :	827-830
Peer reviewed :	Yes
Audience :	International
ISSN :	0928-0707
City :	Dordrecht
Keywords :	[en] 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.
Funders :	Fonds de la Recherche Scientifique (Communauté française de Belgique) - F.R.S.-FNRS
Permalink :	http://hdl.handle.net/2268/9428
	also: http://hdl.handle.net/2268/100800

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