Reference : Preparation and characterization of xerogel catalyst microspheres
Scientific journals : Article
Engineering, computing & technology : Materials science & engineering
Engineering, computing & technology : Chemical engineering
http://hdl.handle.net/2268/20078
Preparation and characterization of xerogel catalyst microspheres
English
Alié, Christelle mailto [Université de Liège - ULg > Département de Chimie appliquée > Génie chimique - Chimie physique appliquée > >]
Ferauche, Fabrice [Université de Liège - ULG > Département de Chimie appliquée > Génie chimique - Chimie physique appliquée > >]
Heinrichs, Benoît mailto [Université de Liège - ULg > Département de chimie appliquée > Génie chimique - Chimie physique appliquée > >]
Pirard, René [Université de Liège - ULg > Département de chimie appliquée > Génie chimique - Chimie physique appliquée > >]
Winterton, Neil [> > > >]
Pirard, Jean-Paul mailto [Université de Liège - ULg > Département de chimie appliquée > Génie chimique - Chimie physique appliquée > >]
15-Dec-2004
Journal of Non-Crystalline Solids
Elsevier Science Bv
350
290-298
Yes (verified by ORBi)
International
0022-3093
Amsterdam
[en] LOW-DENSITY XEROGELS ; MERCURY POROSIMETRY ; ADDITIVES ; PARTICLES ; AG/SIO2 ; PD/SIO2
[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.
Fonds de la Recherche Scientifique (Communauté française de Belgique) - F.R.S.-FNRS
http://hdl.handle.net/2268/20078

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