References of "Studies in Surface Science and Catalysis"
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See detailPreparation of CMI-1 supported H3+xPMo12-xVxO40 for the selective oxidation of propylene
Benadji, S.; Eloy, P.; Léonard, Alexandre ULiege et al

in Studies in Surface Science and Catalysis (2010), 175

Catalysts, comprising 30 wt.% of heteropolyacids (HPAs) H 3+xPMo 12-xV xO 40 (x = 0-3) supported on a mesoporous material CMI-1 by dry impregnation were characterized by several techniques. Their ... [more ▼]

Catalysts, comprising 30 wt.% of heteropolyacids (HPAs) H 3+xPMo 12-xV xO 40 (x = 0-3) supported on a mesoporous material CMI-1 by dry impregnation were characterized by several techniques. Their catalytic performances were compared to those of bulk HPAs in the propylene oxidation by molecular oxygen at 350°C. The supported HPAs exhibit higher catalytic activity in propylene oxidation than the bulk ones and favoured the formation of acrolein, acetaldehyde and acetic acid, compared to the mother catalysts which lead only to the formation of COx. The enhanced oxidation catalytic activity of supported systems was attributed to the fine dispersion of H 3+xPMo 12-xVxO 40 species on the CMI-1 mesoporous material via physical adsorption, together with the fact that the structure of both CMI-1 and HPAs remained intact during the impregnation. © 2010 Elsevier B.V. All rights reserved. [less ▲]

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See detailSynthesis and characterization of highly loaded Pt/carbon xerogel catalysts prepared by Strong Electrostatic Adsorption method
Job, Nathalie ULiege; Maillard, Frédéric; Chatenet, Marian et al

in Studies in Surface Science and Catalysis (2010), 175

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See detailFunctionalization of carbon xerogels for the preparation of Pd/C catalysts by grafting of Pd complex
Diverchy, Chantal; Hermans, Sophie; Job, Nathalie ULiege et al

in Studies in Surface Science and Catalysis (2010), 175

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See detailImmobilization of homogeneous catalysts in nanostructured carbon xerogels
Gheorghiu, C. C.; Perez-Cadenas, Maria; Roman-Martinez, M. C. et al

in Studies in Surface Science and Catalysis (2010), 175

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See detailCompressing some sol-gel materials reduces their stiffness: a textural analysis
Gommes, Cédric ULiege; Job, Nathalie ULiege; Blacher, Silvia ULiege et al

in Studies in Surface Science and Catalysis (2007), 160

The mechanical behaviour of two series of silica and of resorcinol xerogels is analyzed by mercury porosimetry. The data are expressed as pressure-density curves, which enables textural information to be ... [more ▼]

The mechanical behaviour of two series of silica and of resorcinol xerogels is analyzed by mercury porosimetry. The data are expressed as pressure-density curves, which enables textural information to be obtained. In particular, it is shown that some of the analyzed samples exhibit a marked lowering of their mechanical stiffness upon compression. This observation is analyzed in terms of the collapse of the sample’s porosity and of the heterogeneity of the microstructure. [less ▲]

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See detailThe porous structure of biodegradable scaffolds obtained with supercritical CO2 as foaming agent
Blacher, Silvia ULiege; Calberg, Cédric ULiege; Kerckhofs, Greet ULiege et al

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

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See detailThe porous structure of biodegradable scaffolds obtained with supercritical CO(2) as foaming agent
Blacher, Silvia ULiege; Calberg, Cédric ULiege; Kerckhofs, Greet ULiege 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 ▲]

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See detailOptimized conditions for the preparation of Pt supported catalysts by deposition-precipitation
Cellier, Caroline; Lambert, Stéphanie ULiege; Lahousse, C. et al

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

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See detailMetal catalysts suppported on texture-tailored carbon xerogels
Job, Nathalie ULiege; Léonard, Angélique ULiege; Colomer, Jean-François et al

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

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See detailImmobilizing metal nanoparticles in porous silica through sol-gel process
Heinrichs, Benoît ULiege; Beketov, Gennadiy; Lambert, Stéphanie ULiege et al

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

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See detailLarge-scale synthesis and forming of xerogel catalysts
Alié, Christelle ULiege; Ferauche, Fabrice; Tcherkassova, Natalia et al

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

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See detailQuantitative morphological studies of mesoporous catalysts at nanometer scale resolution
Ziese, Ulrike; Gommes, Cédric ULiege; Blacher, Silvia ULiege et al

in Studies in Surface Science and Catalysis (2005), 158

We have combined electron tomography with posterior image processing for a quantitative morphological study of mesoporous catalysts at nanometer scale resolution. As a first example for the possibilities ... [more ▼]

We have combined electron tomography with posterior image processing for a quantitative morphological study of mesoporous catalysts at nanometer scale resolution. As a first example for the possibilities of the approach, pore size distributions of single particles of commercial USY and XVUSY zeolites were derived. [less ▲]

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See detailQualitative assessment of the purity of multi-walled carbon nanotube samples using krypton adsorption
Gommes, Cédric ULiege; Noville, Francis ULiege; Bossuot, Christophe et al

in Studies in Surface Science and Catalysis (2005), 160

Krypton is a subcritical vapour at the nitrogen boiling temperature. As such, its adsorption on crystalline surfaces leads to condensation steps, typical of type VI isotherms according to IUPAC, while its ... [more ▼]

Krypton is a subcritical vapour at the nitrogen boiling temperature. As such, its adsorption on crystalline surfaces leads to condensation steps, typical of type VI isotherms according to IUPAC, while its adsorption on rough surfaces is BET-like. Based on this property of krypton adsorption at 77 K, a methodology is proposed to determine the purity of carbon nanotubes samples. The method is tested on model samples obtained by mixing mechanically purified multi-walled carbon nanotubes with various amounts of the same catalyst as used for their synthesis. [less ▲]

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See detailNanostructured mesoporous TiO2, ZrO2 and SiO2 synthesis by using the non-ionic Cm(EO)n - inorganic alkoxyde system : toward a better understanding on the formation mechanism
Blin, Jean-Luc; Léonard, Alexandre ULiege; Gigot, Laurent et al

in Studies in Surface Science and Catalysis (2003), 146

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See detailControl of ordered mesoporous molecular sieves synthesis using non-ionic surfactants by incorporation of transition metal ions in the micellar solution
Léonard, Alexandre ULiege; Blin, Jean-Luc; Herrier, Gontran et al

in Studies in Surface Science and Catalysis (2003), 146

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See detailMesoporous zirconium oxides: An investigation of physico-chemical synthesis parameters
Blin, J. L.; Gigot, L.; Léonard, Alexandre ULiege et al

in Studies in Surface Science and Catalysis (2002), 141

A systematic kinetic study of mesoporous zirconia formation has been performed in order to optimize the synthesis conditions without addition of structure stabilizing agents such as sulfate or phosphate ... [more ▼]

A systematic kinetic study of mesoporous zirconia formation has been performed in order to optimize the synthesis conditions without addition of structure stabilizing agents such as sulfate or phosphate anions. We have investigated in particular the effect of synthesis time and temperature. On the basis of TEM, SEM XRD and N 2 adsorption-desorption results, a synthesis mechanism has been proposed. Low temperature or short duration afford supermicroporous materials and continuation of hydrothermal treatment makes the walls separating adjacent pores break down allowing the transformation to mesopores. The obtained materials have a uniform pore size and their surface can reach 400m 2/g. However, if hydrothermal treatment is performed at too high temperatures or for too long durations, mesoporous compounds are no longer obtained, but thermodynamically more stable crystalline zirconium oxides with very low specific surface area, namely the tetragonal and monoclinic forms, are the final phases that are more likely to appear. [less ▲]

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See detailSynthesis of highly ordered mesoporous compounds with control of morphology using a non-ionic surfactant as template
Léonard, Alexandre ULiege; Blin, J. L.; Su, B.-L.

in Studies in Surface Science and Catalysis (2002), 141

Highly ordered hexagonal mesostructures (CMI-1 compounds) can be obtained under mild acidic conditions by working at low concentrations of non-ionic decaoxyethylene cetyl ether [C16(EO)10]. The present ... [more ▼]

Highly ordered hexagonal mesostructures (CMI-1 compounds) can be obtained under mild acidic conditions by working at low concentrations of non-ionic decaoxyethylene cetyl ether [C16(EO)10]. The present work shows that it is possible to gain control at the nanometer scale over the packing symmetry of the channels, as well as at the micrometer level over the morphology of the particles by varying the surfactant / silica molar ratio and the hydrothermal treatment conditions. Very high loadings of silica precursors typically afford highly ordered hexagonal CMI-1 compounds whereas an increase of the surfactant / silica molar ratio results in materials with a more disordered channel array. In a parallel way, very low molar ratios of surfactant / silica lead to ropes, gyroids and toroids whereas spheres are the most stable shape with the lower quantities of silica. From this point, it appears thus that not only the structure but also the morphologies encountered for MCM-41 type mesoporous silica can be reproduced with a non-ionic templating agent. [less ▲]

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See detailSynthesis and characterization of nanostructured mesoporous zirconia catalyst supports using non-ionic surfactants as templating agents
Blin, J. L.; Gigot, L.; Léonard, Alexandre ULiege et al

in Studies in Surface Science and Catalysis (2002), 143

The formation of nanostructured porous zirconia catalyst supports using non-ionic surfactants as templating agents has been studied in order to optimize the synthesis conditions without addition of ... [more ▼]

The formation of nanostructured porous zirconia catalyst supports using non-ionic surfactants as templating agents has been studied in order to optimize the synthesis conditions without addition of structure stabilizing agents such as sulfate or phosphate anions. The effect of the quantity of added zirconium source with respect to the surfactant concentration in solution has been studied. We also examined the role played by the surfactant during the synthesis. Further investigations have shown that the pore diameters could be increased towards the mesoporous domain if heating time and temperature are raised. The present work reveals that the control of the balance between the precipitation rate of zirconia and the interaction of zirconium source will be fatal in the formation of nanostructured porous zirconia. [less ▲]

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See detailTowards a better understanding on the mechanism of mesoporous formation via an assembly of C n(EO) m and TMOS
Blin, J. L.; Léonard, Alexandre ULiege; Herrier, G. et al

in Studies in Surface Science and Catalysis (2002), 141

The present work deals with a systematic study of mesoporous materials synthesis. A series of polyoxyethylene alkyl ether surfactants such as C 13(EO) n (n = 6, 12, 18), C 16(EO) 10, C 18(EO) 10 have been ... [more ▼]

The present work deals with a systematic study of mesoporous materials synthesis. A series of polyoxyethylene alkyl ether surfactants such as C 13(EO) n (n = 6, 12, 18), C 16(EO) 10, C 18(EO) 10 have been used. It is revealed that the surfactant conformation changed with the heating temperature. Indeed, at higher temperatures, a more extended molecular conformation can be obtained, which leads to materials with larger pore sizes. We have also shown that the interaction between template and silica disturbs the hexagonal array of micelles in solution leading to the formation of DWM-1 or DWM-2 compounds for concentrated micellar solution. We have also correlated the structural characteristics of the recovered mesoporous molecular sieves with the V H/V L ratio of the template. [less ▲]

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See detailPreparation of highly ordered CMI-1 and wormhole-like DWM mesoporous silica catalyst supports using C 16(EO) 10 as surfactant
Léonard, Alexandre ULiege; Blin, J.-L.; Su, B.-L.

in Studies in Surface Science and Catalysis (2002), 143

Concentrations of polyoxyethylene alkyl ether surfactants located in the hexagonal H1 micellar domain typically afford disordered mesoporous structures of wormhole-like channels after polymerization of ... [more ▼]

Concentrations of polyoxyethylene alkyl ether surfactants located in the hexagonal H1 micellar domain typically afford disordered mesoporous structures of wormhole-like channels after polymerization of the inorganic precursor in solution. The effect of hydrothermal treatment duration and temperature on the characteristics of the obtained disordered DWM (Disordered Wormhole-like Mesostructure) compounds has been investigated. Thermal stability of these samples has also been studied and appears to be superior to that of MCM-41 type materials. If the weight percentage of surfactant in solution is however decreased, well-ordered hexagonal CMI-1 can be directly obtained. In this case, a co-operative mechanism leading to spherical particles of organized channel structures has been proposed. Influence of the surfactant concentration on the arrangement has been discussed in detail. [less ▲]

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