Reference : Pd-Ag/SiO2 xerogel catalyst forming by impregnation on alumina foams
Scientific journals : Article
Physical, chemical, mathematical & earth Sciences : Chemistry
Engineering, computing & technology : Materials science & engineering
Engineering, computing & technology : Chemical engineering
http://hdl.handle.net/2268/6495
Pd-Ag/SiO2 xerogel catalyst forming by impregnation on alumina foams
English
[fr] Mise en forme de catalyseur de type xérogel Pd-Ag/SiO2 par imprégnation sur des mousses d'alumine
Alié, Christelle mailto [Université de Liège - ULg > > Chimie générale et chimie physique >]
Ferauche, Fabrice [Université de Liège - ULG > Département de chimie appliquée > Génie chimique - Génie catalytique > >]
Léonard, Angélique mailto [Université de Liège - ULg > Département de chimie appliquée > Génie chimique - Opérations physiques unitaires - Département de chimie appliquée >]
Lambert, Stéphanie mailto [Université de Liège - ULg > Département de chimie appliquée > Génie chimique - Génie catalytique >]
Tcherkassova, Natalia mailto [Université de Liège - ULG > Département de chimie appliquée > Génie chimique - Génie catalytique > > >]
Heinrichs, Benoît mailto [Université de Liège - ULg > Département de chimie appliquée > Génie chimique - Génie catalytique >]
Crine, Michel mailto [Université de Liège - ULg > Département de chimie appliquée > Génie chimique - Opérations physiques unitaires >]
Marchot, Pierre mailto [Université de Liège - ULg > Département de chimie appliquée > Génie chimique - Systèmes polyphasiques >]
Loukine, E. [> > > >]
Pirard, Jean-Paul mailto [Université de Liège - ULg > Département de chimie appliquée > Génie chimique - Génie catalytique >]
15-Mar-2006
Chemical Engineering Journal
Elsevier Science Sa
117
1
13-22
Yes (verified by ORBi)
International
1385-8947
Lausanne
[en] bimetallic Pd-Ag catalysts ; sol-gel process ; forming ; porosity ; hydrodechlorination ; image analysis
[en] A Pd-Ag/SiO2 xerogel catalyst prepared in one step by sol-gel process has been entrapped in cylindrical porous alumina foams of three different pore sizes in order to shape the catalyst under the appropriate form with suitable mechanical resistance to be used in an industrial fixed bed reactor. After drying, calcination and reduction, the Pd-Ag/SiO2 xerogel catalyst pellets are immobilized inside the open porosity of the alumina foam. The localization of the xerogel catalyst in the alumina foams has been studied by X-ray tomography. The three-dimensional porous structure was reconstructed from the consecutive cross-sections obtained by this technique. This method shows that the Pd-Ag/SiO2 xerogel catalyst is uniformly dispersed inside the porosity of the alumina foams. Activity and selectivity of Pd-Ag/SiO2 xerogel catalyst reference or catalyst entrapped in alumina foams have been studied for selective hydrodechlorination of 1,2-dichloroethane into ethylene. The specific reaction rate obtained with catalyst entrapped in alumina foams is smaller than the one obtained from corresponding catalyst powders. The catalytic activity decrease observed for Pd-Ag/SiO2 xerogel catalyst entrapped in porous alumina foams most probably arises from diffusional limitations inside the porous texture of the alumina foams. (c) 2005 Elsevier B.V. All rights reserved.
Fonds de la Recherche Scientifique (Communauté française de Belgique) - F.R.S.-FNRS
http://hdl.handle.net/2268/6495

File(s) associated to this reference

Fulltext file(s):

FileCommentaryVersionSizeAccess
Open access
Chem_Eng_J_Orbi.pdfAuthor postprint448.83 kBView/Open

Bookmark and Share SFX Query

All documents in ORBi are protected by a user license.