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Preparation and characterization of xerogel catalyst microspheres
Alié, Christelle; Ferauche, Fabrice; Heinrichs, Benoît et al.
20037th International Symposium on Aerogels, ISA 7
 

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Abstract :
[en] For easier handling and use in fixed bed reactors, Pd-Ag/SiO2 aerogel-like xerogel catalysts were shaped into microspheres using the microencapsulation process developed by BRACE GmbH. Before the bead production process, the xerogel catalyst was ground in water and mixed with ethylene glycol and sodium alginate, the latter of which is the gelation agent. The beads were formed at a vibrating nozzle and solidified during their fall in a water tank containing calcium ions, which induce cross-linking of the alginate and consequent bead hardening. Preliminary work was done using a syringe instead of the material-consuming BRACE unit. The beads were made from a suspension of dried only, dried and calcined, or dried, calcined, and reduced catalyst. The textural properties of the beads were analyzed by nitrogen adsorption-desorption isotherms and mercury porosimetry; and bead catalytic activity was tested for selective hydrodechlorination of 1,2-dichloroethane. The beads made from a suspension of dried catalyst appear to have properties the closest to that of the xerogel reference catalyst. Porosity and surface area are maintained at their level before bead formation. However conversion of 1,2-dichloroethane decreases after the production process, possibly due to poisoning by calcium ions. (C) 2004 Elsevier B.V. All rights reserved.
Disciplines :
Materials science & engineering
Chemical engineering
Author, co-author :
Alié, Christelle ;  Université de Liège - ULiège > Département de chimie appliquée > Génie chimique - Chimie physique appliquée
Ferauche, Fabrice;  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
Pirard, René ;  Université de Liège - ULiège > Département de chimie appliquée > Génie chimique - Chimie physique appliquée
Winterton, Neil
Pirard, Jean-Paul ;  Université de Liège - ULiège > Département de chimie appliquée > Génie chimique - Génie catalytique
Language :
English
Title :
Preparation and characterization of xerogel catalyst microspheres
Publication date :
2003
Event name :
7th International Symposium on Aerogels, ISA 7
Event place :
Alexandria, Virginie, United States
Event date :
2-5 November 2003
Audience :
International
Funders :
F.R.S.-FNRS - Fonds de la Recherche Scientifique [BE]
Commentary :
Book of abstracts of the "7th International Symposium on Aerogels, ISA 7, Alexandria, Virginia, USA, 2-5 November 2003", p. 54
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since 28 August 2009

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