Formation and structural characteristics of Pd-Ag/SiO2 and Pd-Cu/SiO2 catalysts synthesized by cogelation

COGELLED XEROGEL CATALYSTS; LOW-DENSITY XEROGELS; SOL-GEL CATALYSTS; X-RAY-DIFFRACTION; PD-CU CATALYSTS; SELECTIVE HYDRODECHLORINATION; SURFACE-COMPOSITION; SUBSTITUTED ALKOXYSILANES; NUCLEATION PHENOMENON; BIMETALLIC CATALYSTS

Abstract :

[en] Pd-Ag/SiO2 and Pd-Cu/SiO2 xerogel catalysts have been synthesized by cogelation of tetraethoxysilane (TEOS) and chelates of either Pd and Ag or Pd and Cu with 3-(2-aminoethylamino)propyltrimethoxysilane (EDAS). After an extensive study of the influences of synthesis operating variables over structural characteristics of gels, highly dispersed bimetallic Pd-Ag/SiO2 and Pd-Cu/SiO2 xerogel catalysts were obtained. These samples are then composed of completely accessible Pd-Ag and Pd-Cu alloy crystallites with sizes of 2-3.5 nm located inside silica particles exhibiting a monodisperse microporous distribution. It appears also that the metal complex acts as a nucleation agent in the formation of silica particles. (c) 2005 Elsevier B.V. All rights reserved.

Disciplines :

Materials science & engineering
Chemical engineering

Author, co-author :

Lambert, Stéphanie ; Université de Liège - ULiège > Département de chimie appliquée > Génie chimique - Chimie physique appliquée

Gommes, Cédric ; Université de Liège - ULiège > Département de chimie appliquée > Génie chimique - Chimie physique appliquée

Alié, Christelle ; Université de Liège - ULiège > Département de chimie appliquée > Chimie générale et chimie physique

Tcherkassova, Natalia ; Université de Liège - ULiège > Département de Chimie appliquée > Génie chimique - Chimie physique appliquée

Pirard, Jean-Paul ; Université de Liège - ULiège > Département de chimie appliquée > Génie chimique - Chimie physique appliquée

Heinrichs, Benoît ; Université de Liège - ULiège > Département de chimie appliquée > Génie chimique - chimie physique appliquée

Language :

English

Title :

Formation and structural characteristics of Pd-Ag/SiO2 and Pd-Cu/SiO2 catalysts synthesized by cogelation

Publication date :

2005

Journal title :

Journal of Non-Crystalline Solids

ISSN :

0022-3093

Publisher :

Elsevier Science, Amsterdam, Netherlands

Volume :

351

Issue :

52-54

Pages :

3839-3853

Peer reviewed :

Peer Reviewed verified by ORBi

Funders :

F.R.S.-FNRS - Fonds de la Recherche Scientifique

Available on ORBi :

since 04 September 2009

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