• Article dans une revue

Reactivity of oxygen species formed upon N2O dissociation over Fe-ZSM-5 zeolite: CO oxidation as a model

Hazar Guesmi, Dorothée Berthomieu, Lioubov Kiwi-Minsker

The oxidative power toward CO of α-oxygen formed upon N2O dissociation over isolated and binuclear Fe/ZSM-5 zeolite is investigated by means of DFT calculations. The two α-sites [Fe-O]+ and [Fe-(μO)-(μOH)-Fe]+ exchanged in ZSM-5 were considered since their activity in the N2O decomposition was…

Catalysis Communications, 2010, 11 (12), pp.1026-1031. ⟨10.1016/j.catcom.2010.05.001⟩. ⟨hal-00489623⟩

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Vanadium-containing SBA-15 systems prepared by direct synthesis: physicochemical and catalytic properties in the decomposition of dichloromethane

Marco Piumetti, Barbara Bonelli, Marco Armandi, Lucia Gaberova, Sandra Casale, Pascale Massiani, Edoardo Garrone

Vx/SBA-15 catalysts (V content = 0.7-4.8 wt.%) were directly synthesized and tested for the oxidative decompn. of dichloromethane; impregnation-synthesized SBA-15 and V/SBA-15 catalysts were ref. samples. Catalyst structural and surface properties were characterized by complementary physicochem.…

Microporous and Mesoporous Materials, 2010, 133 (1-3), pp.36-44. ⟨10.1016/j.micromeso.2010.04.011⟩. ⟨hal-00604792⟩

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Group V metal substitution in silicate model zeolites: In search for the active site

Frederik Tielens, Stanislaw Dzwigaj

Group V substituted zeolites were characterized using periodic DFT. It is found that the group V sites in zeolite materials become more hydrophobic and less reducible descending the column of the Period Table. The stable site with T=O group for T = V, transforms into a site with T-OH group for T =…

Chemical Physics Letters, 2010, 501 (1-3), pp.59-63. ⟨10.1016/j.cplett.2010.10.038⟩. ⟨hal-00604803⟩

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Quantitative relationship between the nature of surface species and the catalytic activity of tungsten oxides supported on crystallized titania

Thomas Onfroy, Vanessa Lebarbier, Guillaume Clet, Marwan Houalla

A series of WOx/TiO2 catalysts contg. between 0.6 and 3.4 W at./nm2 was prepd. by pore vol. impregnation using ammonium metatungstate soln. on crystd. TiO2. Characterization of the solids by X-ray diffraction and Raman and IR spectroscopy indicated that the W phase was present essentially as a…

Journal of Molecular Catalysis A: Chemical, 2010, 318 (1-2), pp.1-7. ⟨10.1016/j.molcata.2009.11.013⟩. ⟨hal-00604787⟩

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Catalytic Aspects of Light-Induced Hydrogen Generation in Water with TiO2 and Other Photocatalysts: A Simple and Practical Way Towards a Normalization?

Thomas Maschmeyer, Michel Che

Evaluation is discussed of performance of solid photocatalysts for H2 generation from H2O so that they can be compared in a simple way whether sacrificial soln. is used or not. The addnl. chem. potential present in a sacrificial soln. will be the same regardless of the catalyst system used, so…

Angewandte Chemie International Edition, 2010, 49 (9), pp.1536-1539. ⟨10.1002/anie.200903921⟩. ⟨hal-00604779⟩

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Synthesis, characterization and catalytic activity of meso-niobium phosphate in the oxidation of benzyl alcohols

Michèle C. Reis, Suellen D.T. Barros, Elizabeth R. Lachter, Rosane A.S. San Gil, Jhonny H. Flores, Maria I. Pais da Silva, Thomas Onfroy

In this work mesoporous niobium phosphate was synthesized hydrothermally by using SDS as the structure directing agent. The catalysts were characterized by N2 adsorption, DRX, 31P MAS NMR and FTIR. The activity of commercial and synthesized niobium phosphate catalysts were evaluated through the…

Catalysis Today, 2012, 192, pp.117-122. ⟨10.1016/j.cattod.2012.05.025⟩. ⟨hal-00751901⟩

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Chiral Ammonium-Capped Rhodium(0) Nanocatalysts: Synthesis, Characterization, and Advances in Asymmetric Hydrogenation in Neat Water

Elodie Guyonnet Bil É, Elodie Cortelazzo-Polisini, Audrey Denicourt-Nowicki, Rita Sassine, Franck Launay, Alain Roucoux

Optically active amphiphilic compounds derived from N-methylephedrine, N-methylprolinol, or cinchona derivatives possessing bromide or chiral lactate counterions were efficiently used as protective agents for rhodium(0) nanoparticles. The full characterization of these surfactants and the obtained…

ChemSusChem, 2012, 5, pp.91-101. ⟨10.1002/cssc.201100364⟩. ⟨hal-00750000⟩

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Effect of vanadium dispersion and of support properties on the catalytic activity of V-containing silicas

Marco Piumetti, Barbara Bonelli, Pascale Massiani, Stanislaw Dzwigaj, Ilenia Rossetti, Sandra Casale, Marco Armandi, Cyril Thomas, Edoardo Garrone

Two V-SBA-15 and V-MCF materials (containing about 2.5 wt.% vanadium) were prepared by direct synthesis and tested as catalysts in the decomposition of the most stable chlorinated-alkane, dichloromethane (a total oxidation reaction) and in the oxidative dehydrogenation (ODH) of propane (a partial…

Catalysis Today, 2011, 179, pp.140-148. ⟨10.1016/j.cattod.2011.06.028⟩. ⟨hal-00687622⟩

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Profiling the Active Site of a Copper Enzyme through Its Far-Infrared Fingerprint

Laure Marboutin, Hugo Petitjean, Bertrand Xerri, Nicolas Vita, François Dupeyrat, Jean-Pierre Flament, Dorothée Berthomieu, C. Berthomieu

Angewandte Chemie International Edition, 2011, 50, pp.8062-8066. ⟨10.1002/anie.201102014⟩. ⟨hal-00806802⟩

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Controlled preparation of CoPdSiBEA zeolite catalysts for selective catalytic reduction of NO with methane and their characterisation by XRD, DR UV-vis, TPR, XPS

Ana Rodrigues, Patrick da Costa, C. Methivier, S. Dzwigaj

The Pd0.15SiBEA and CoxPd0.15SiBEA zeolites (where x= 1.0 and 3.0 wt.% Co) are prepared by a two-step postsynthesis method which allows to control the introduction of palladium and cobalt into zeolite and thus to obtain catalysts with specific bimetallic Pd and Co sites. The effect of Co content on…

Catalysis Today, 2011, 176, pp.72-76. ⟨10.1016/j.cattod.2011.03.013⟩. ⟨hal-00666188⟩