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| Reference : Study of textural properties and nucleation phenomenon in Pd/SiO2, Ag/SiO2 and Cu/SiO2 c... |
| Scientific journals : Article | |||
| Engineering, computing & technology : Materials science & engineering Engineering, computing & technology : Chemical engineering | |||
| http://hdl.handle.net/2268/27217 | |||
| Study of textural properties and nucleation phenomenon in Pd/SiO2, Ag/SiO2 and Cu/SiO2 cogelled xerogel catalysts | |
| English | |
Lambert, Stéphanie  [Université de Liège - ULg > Département de chimie appliquée > Génie Chimique - Chimie physique appliquée > >] | |
| Alié, Christelle [Université de Liège - ULg > Département de Chimie appliquée > Génie chimique - Chimie physique appliquée > >] | |
| Pirard, Jean-Paul [Université de Liège - ULg > Département de chimie appliquée > Génie chimique - Chimie physique appliquée > >] | |
| Heinrichs, Benoît [Université de Liège - ULg > Département de chimie appliquée > Génie chimique - Chimie physique appliquée > >] | |
| 15-Aug-2004 | |
| Journal of Non-Crystalline Solids | |
| Elsevier Science Bv | |
| 342 | |
| 1-3 | |
| 70-81 | |
| International | |
| 0022-3093 | |
| Amsterdam | |
| [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). The resulting materials are composed of completely accessible metallic crystallites with a diameter of about 3 nm, located inside silica particles exhibiting a monodisperse microporous distribution centered on a pore width of about 0.8 nm. Voids between silica particles and between aggregates of silica particles constitute the material meso- and macroporous texture. The EDAS/TEOS ratio is the main operating variable to tailor the material morphology. When the EDAS/TEOS ratio decreases, metallic particle size decreases, whereas silica particle size increases. Thus the meso- and macropores between silica particles are larger. So the total pore volume can reach 5 cm(3)/g when the EDAS/TEOS ratio decreases. The remarkable morphology of these materials can be explained by the rule in which the EDAS metal complex acts as a nucleation agent in the formation of silica particles. A nucleation mechanism by EDAS-metal complex based on mass equations and the nuclei formation kinetics allows fitting the entire results. (C) 2004 Elsevier B.V. All rights reserved. | |
| Fonds de la Recherche Scientifique (Communauté française de Belgique) - F.R.S.-FNRS | |
| http://hdl.handle.net/2268/27217 | |
| also: http://hdl.handle.net/2268/15565 |
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