References of "Léonard, Angélique"
     in
Bookmark and Share    
Full Text
Peer Reviewed
See detailPd-Ag/SiO2 xerogel catalyst forming by impregnation on alumina foams
Alié, Christelle ULg; Ferauche, Fabrice; Léonard, Angélique ULg et al

in Chemical Engineering Journal (2006), 117(1), 13-22

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 ... [more ▼]

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. [less ▲]

Detailed reference viewed: 67 (6 ULg)
Full Text
See detailTechniques tomographiques : des outils de choix pour l’étude des réacteurs polyphasiques
Toye, Dominique ULg; Fransolet, Emmanuelle; Léonard, Angélique ULg et al

Conference (2006, March 14)

Detailed reference viewed: 9 (1 ULg)
Peer Reviewed
See detailCaractérisation de matériaux poreux par analyse d'images 3D
Blacher, Silvia ULg; Gommes, Cédric ULg; Léonard, Angélique ULg et al

Conference (2006, February)

Detailed reference viewed: 41 (5 ULg)
Full Text
Peer Reviewed
See detailSynthesis optimization of organic xerogels produced from convective air-drying of resorcinol-formaldehyde gels
Job, Nathalie ULg; Panariello, Fabian; Marien, José ULg et al

in Journal of Non-Crystalline Solids (2006), 352(1), 24-34

Resorcinol-formaldehyde gels were produced at 50, 70 and 90 degrees C and with three different R/C ratios (500, 1000 and 2000). The effect of these variables combined with that of aging time was studied ... [more ▼]

Resorcinol-formaldehyde gels were produced at 50, 70 and 90 degrees C and with three different R/C ratios (500, 1000 and 2000). The effect of these variables combined with that of aging time was studied in order to optimize the synthesis conditions. The convective air-drying process was used, and the drying duration was studied with regard to the synthesis conditions. The aging time has no effect on the pore texture after 24 h at 90 degrees C or 48 h at 70 C, whatever the R/C value. The synthesis-aging step can be shortened by increasing the temperature. Nevertheless, the pore size tends then to decrease, especially when R/C is high, but this can be counterbalanced by increasing R/C. Moreover, bubbles often appear in the gel at high synthesis temperature, which limits the temperature to about 70 degrees C in the case of monolithic parts. At 70 degrees C and with an air velocity of 2 m/s, the elimination of 90% of the solvent requires 1 h drying when the pore size reaches 400-600 nm, 2.5 h for 50 nm wide pores and 3 h when the pore size decreases to 15-20 nm. The drying duration does not exceed 8 h in all cases and could be shortened by increasing the temperature at the end of the process. (c) 2005 Elsevier B.V. All rights reserved. [less ▲]

Detailed reference viewed: 40 (1 ULg)
Full Text
Peer Reviewed
See detailUse of x-ray microtomography to visualise dynamic adsorption of organic vapour and water vapour on activated carbon
Lodewyckx, Peter; Blacher, Silvia ULg; Léonard, Angélique ULg

in Adsorption (2006), 12(1), 19-26

X-ray microtomography coupled with image analysis was used to quantify the adsorption of vapours on activated carbon beds. This technique was tested using three different challenges: CCl4, water vapour ... [more ▼]

X-ray microtomography coupled with image analysis was used to quantify the adsorption of vapours on activated carbon beds. This technique was tested using three different challenges: CCl4, water vapour and a mixture of water- and organic vapour. It is shown that the used technique allows determining the adsorption front progress in the case of organic vapour and mixture of water and organic vapour whereas the existence of this front was not so obvious in the case of water vapour. Experimental results obtained for organic vapours were interpreted on the basis of the Wheeler-Jonas equation: a good agreement was found between experimental and theoretical breakthrough times. [less ▲]

Detailed reference viewed: 64 (14 ULg)
Full Text
Peer Reviewed
See detailThe porous structure of biodegradable scaffolds obtained with supercritical CO2 as foaming agent
Blacher, Silvia ULg; Calberg, Cédric ULg; Kerckhofs, Greet ULg et al

in Studies in Surface Science and Catalysis (2006), 160

Detailed reference viewed: 7 (2 ULg)
Full Text
Peer Reviewed
See detailThe porous structure of biodegradable scaffolds obtained with supercritical CO(2) as foaming agent
Blacher, Silvia ULg; Calberg, Cédric ULg; Kerckhofs, Greet ULg et al

in Studies in Surface Science and Catalysis (2006), 160

Poly(epsilon-caprolactone) foams were prepared, via a batch process, by using supercritical CO(2) as foaming agent. Their porous structure was characterized through helium and mercury pycnometry, scanning ... [more ▼]

Poly(epsilon-caprolactone) foams were prepared, via a batch process, by using supercritical CO(2) as foaming agent. Their porous structure was characterized through helium and mercury pycnometry, scanning electron microscopy (SEM) and X-ray microtomography observations coupled with image analysis. The pore size distributions obtained by these two latter techniques show that the pore structure is more homogeneous when the foaming process is performed under a high CO(2) saturation pressure (higher than 250 bars). [less ▲]

Detailed reference viewed: 6 (1 ULg)
Full Text
Peer Reviewed
See detailMetal catalysts suppported on texture-tailored carbon xerogels
Job, Nathalie ULg; Léonard, Angélique ULg; Colomer, Jean-François et al

in Studies in Surface Science and Catalysis (2006), 162

Detailed reference viewed: 47 (4 ULg)
Full Text
Peer Reviewed
See detailProduction de xérogels de carbone hyperporeux par séchage convectif
Léonard, Angélique ULg; Job, Nathalie ULg; Jomaa, Wahbi et al

in Azzaro-Pantel, Catherine; Bertrand, Joel; Cabassub, Michel (Eds.) et al Récents progrès en génie des procédés N° 92: 10ème Congrès de la SFGP, Toulouse 2005. Le génie des procédés vers de nouveaux espaces (2005, October)

Detailed reference viewed: 38 (2 ULg)
Full Text
Peer Reviewed
See detailTowards the production of carbon xerogel monoliths by optimizing convective drying conditions
Léonard, Angélique ULg; Sabatier, Françoise; Job, Nathalie ULg et al

Poster (2005, October)

Detailed reference viewed: 34 (10 ULg)
Full Text
Peer Reviewed
See detailHigh-resolution X-ray microtomography to determine the kinetics of water vapour adsorption
Lodewyckx, Peter; Léonard, Angélique ULg; Blacher, Silvia ULg

Conference (2005, October)

Detailed reference viewed: 16 (0 ULg)
Peer Reviewed
See detailAnalyse quantitative de la texture poreuse d'un matériau polymère cellulaire basée sur des images de microtomographie à rayons X
Lecocq, Raphaël; Toye, Dominique ULg; Maquet, Véronique et al

Poster (2005, October)

Detailed reference viewed: 16 (0 ULg)
Peer Reviewed
See detailÉtude de la texture poreuse d'un matériau polymère cellulaire utilisé en ingénierie tissulaire par microtomographie à rayons X
Lecocq, Raphaël; Toye, Dominique ULg; Maquet, Véronique et al

Poster (2005, October)

Detailed reference viewed: 36 (6 ULg)
Peer Reviewed
See detailProduction de xérogels de carbone hyperporeux par séchage convectif
Léonard, Angélique ULg; Job, Nathalie ULg; Jomaa, W. et al

Poster (2005, September 20)

Detailed reference viewed: 4 (0 ULg)