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  • Article dans une revue

Ta(V)-Single Site BEA Zeolite by Two-Step Postsynthesis Method: Preparation and Characterization

Stanislaw Dzwigaj, Yannick Millot, Michel Che

Ta(1.0)SiBEA and Ta(2.0)SiBEA zeolites are prepared by a two-step postsynthesis method involving first the creation of vacant T-atom sites associated with silanol groups by dealumination of TEABEA zeolite with nitric acid and then the impregnation of the resulting SiBEA zeolite with tantalum…

Catalysis Letters, 2010, 135 (3-4), pp.169-174. ⟨10.1007/s10562-010-0284-5⟩. ⟨hal-00604713⟩

  • Article dans une revue

Toward redox framework single site zeolite catalysts

Stanislaw Dziwag, Michel Che

This paper concerns heterogeneous single site catalysts which are difficult to prepare because of speciation problems related to the two starting components, the solid and the metal precursor solution. A two-step post-synthesis method is used to prepare the V-SiBEA reference system, with vanadium…

Catalysis Today, 2011, 169, pp.232-241. ⟨10.1016/j.cattod.2011.01.035⟩. ⟨hal-00664504⟩

  • Article dans une revue

Mesoporous materials from zeolite seeds as supports for nickel tungsten sulfide active phases Part 1. Characterization and catalytic properties in hydrocracking reactions

Shuangqin Zeng, Juliette Blanchard, Michèle Breysse, Dadong Li, Hong Nie, Yahua Shib, Xintian Su

MCM-41 aluminosilicate mesostructures (Si/Al = 18) with hexagonal long-range order were assembled from protozeolitic nanoclusters (zeolite seeds) that normally nucleate the crystn. of b-zeolite (BEA). Depending on the duration of the thermal treatment leading to the zeolite seeds, different acidic…

Applied Catalysis A : General, 2005, 294, pp.59-67. ⟨10.1016/j.apcata.2005.07.015⟩. ⟨hal-00080297⟩

  • Article dans une revue

Ex-nitrate Co/SBA-15 catalysts prepared with calibrated silica grains: Information given by TPR, TEM, SAXS and WAXS

F. Boubekr, A. Davidson, S. Casale, P. Massiani

The aim of the present work was to check for the presence of an ordered array of Co-based nanoparticles in catalysts prepared by impregnation and by using the two-solvents technique with pentane and cyclohexane on a single SBA-15 batch (prepared by precipitation in strongly acidic conditions (HCl 2…

Microporous and Mesoporous Materials, 2011, 141 (1-3), pp.157-166. ⟨10.1016/j.micromeso.2010.10.038⟩. ⟨hal-00602696⟩

  • Article dans une revue

Microcalorimetric and thermodynamic studies of CO2 and methanol adsorption on magnesium oxide

C. Pighini, Thomas Belin, Jerome Mijoin, Patrick Magnoux, Guylene Costentin, Helene Lauron-Pernot

Both Lewis and Bronsted basic properties of magnesium oxide (MgO) are, respectively, studied by adsorption of CO2 and methanol CH3OH. Various chemical synthesis of pure magnesium oxide (commercial, sol-gel and precipitation methods) are used. The influence of small amounts of alkaline (Na+ and Li…

Applied Surface Science, 2011, 257 (15), pp.6952-6962. ⟨10.1016/j.apsusc.2011.03.040⟩. ⟨hal-00602947⟩

  • Article dans une revue

Electrosynthesis of pyrrole 3-carboxylic acid copolymer films and nanotubes with tunable degree of functionalization for biomedical applications

Cecile J. Roy, Lucas Leprince, Arnaud de Boulard, Jessem Landoulsi, Vincent Callegari, Alain M. Jonas, Sophie Demoustier-Champagne

Tailoring polypyrrole (PPy), an electroactive polymer, with functional groups to which a variety of bioactive molecules can be tethered is highly attractive for building biological structures on conducting surfaces for a range of biomedical applications. In this respect, we investigate the effects…

Electrochimica Acta, 2011, 56 (10), pp.3641-3648. ⟨10.1016/j.electacta.2010.10.076⟩. ⟨hal-00602950⟩

  • Article dans une revue

Novel vanadium-containing mesocellular foams (V-MCF) obtained by direct synthesis

Marco Piumetti, Barbara Bonelli, Pascale Massiani, Yannick Millot, Stanislaw Dzwigaj, Lucia Gaberova, Marco Armandi, Edoardo Garrone

This work reports the preparation and characterization of novel V-containing mesocellular foams (MCF) obtained by direct synthesis: their physico-chemical properties were investigated by means of complementary techniques and comparison was made with V-containing MCF prepared by (traditional)…

Microporous and Mesoporous Materials, 2011, 142 (1), pp.45-54. ⟨10.1016/j.micromeso.2010.11.010⟩. ⟨hal-00602948⟩

  • Article dans une revue

Unsupported shaped cobalt nanoparticles as efficient and recyclable catalysts for the solvent-free acceptorless dehydrogenation of alcohols

Arnaud Viola, Jennifer Péron, Kamila Kazmierczak, Marion Giraud, Carine Michel, Lorette Sicard, Noémie Perret, Patricia Beaunier, Mickaël Sicard, Michele Besson, Jean-Yves Piquemal

Oxidation of alcohols is a key-reaction for the valorization of biomass compounds, and green processes are preferred to avoid the use or production of toxic compounds. In this context, unsupported nanometer-sized catalysts have emerged as very promising materials for heterogeneous catalysis. In…

Catalysis Science & Technology, 2018, 8 (2), pp.562 - 572. ⟨10.1039/C7CY02089A⟩. ⟨hal-01744284⟩

  • Article dans une revue

Fate of L-DOPA in the Presence of Inorganic Matrices: Vectorization or Composite Material Formation?

Maguy Jaber, Meryem Bouchoucha, L. Delmotte, Christophe Méthivier, Jean-Marc Krafft, Jean-François Lambert

Novel bionanocomposite materials were successfully prepared using 2:1 phyllosilicates and an amino acid, L-DOPA. A systematic study of DOPA interactions with these smectites and with a nonporous amorphous silica (Aerosil) used for comparison was undertaken by combining macroscopic information,…

Journal of Physical Chemistry C, 2011, 115, pp.19216-19225. ⟨10.1021/jp205050k⟩. ⟨hal-00670279⟩

  • Article dans une revue

Framework Stabilization of Ge-Rich Zeolites via Postsynthesis Alumination

Ff Gao, M Jaber, K Bozhilov, A Vicente, Christian Fernandez, V Valtchev

The use of organic structure directing agents in zeolite syntheses has dramatically extended the number of zeolite structure types during the past decades. However, for about 20% of all known zeolite structure types, the necessary postsynthesis elimination of organic templates by high-temperature…

Journal of the American Chemical Society, 2009, 131 (45), pp.16580-16586. ⟨10.1021/ja904458y⟩. ⟨hal-01711612⟩