Laboratoire de réactivité de surface

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  • Article dans une revue

Influence of the preparation procedure on the nature and environment of vanadium in VSiBEA zeolite: XRD, DR UV-vis, NMR, EPR and TPR studies

Rafal Baran, Yannick Millot, Thomas Onfroy, Frédéric Averseng, Jean-Marc Krafft, Stanislaw Dzwigaj

Two series of VxSiBEA(I) and VxSiBEA(II) zeolites have been prepared by a two-steps postsynthesis method which consists, in the first step, in the dealumination of TEABEA zeolite by two different procedures to obtain SiBEA(I) and SiBEA(II) zeolites and then, in the second step, in contacting the…

Microporous and Mesoporous Materials, 2012, 161, pp.179-186. ⟨10.1016/j.micromeso.2012.05.023⟩. ⟨hal-00744705⟩

  • Article dans une revue

Chromium sites in zeolite framework: Chromyl or chromium hydroxyl groups?

Frederik Tielens, Mazharul M. Islam, Gabriella Skara, F. de Proft, Tetsuya Shishido, Stanislaw Dzwigaj

A combined experimental and ab initio periodic DFT calculation on the structure and stability of different chromium-substituted zeolite models are presented. Experimental investigation by XRD, FT-IR and UV-vis show the presence of chromium in SiBEA zeolite. The favorable chromium sites are…

Microporous and Mesoporous Materials, 2012, 159, pp.66-73. ⟨10.1016/j.micromeso.2012.02.046⟩. ⟨hal-00744253⟩

  • Article dans une revue

Silver species reduction upon exposure of Ag/Al2O3 catalyst to gaseous ethanol: An in situ Quick-XANES study

Elie Sayah, Camille La Fontaine, Valérie Briois, Dalil Brouri, Pascale Massiani

The evolution of supported silver species of a pre-calcined Ag/Al2O3 catalyst was monitored upon thermal treatment under an air flow enriched with 3000 ppm of ethanol (EtOH) using transmission electron microscopy and UV-visible and X-ray absorption spectroscopies. A special focus is put on the…

Catalysis Today, 2012, 189, pp.55-59. ⟨10.1016/j.cattod.2012.03.055⟩. ⟨hal-00745963⟩

  • Article dans une revue

Specificinteractions of functionalisedgoldsurfaces with ammonium perchlorate or starch; towards a chemical cartography of their mixture

D. Mercier, C. Mercader, S. Quere, Lionel Hairault, Christophe Methivier, Claire-Marie Pradier

By functionalising gold samples, planar wafers or AFM tips, with an acid- or an amino acid-terminated thiols, mercaptoundecanoic acid (MUA) and homocystein (H-Cyst) respectively, we were able to differentiate the interactions with ammonium perchlorate (AP) and starch (S), two components of a…

Applied Surface Science, 2012, 258, pp.9518-9525. ⟨10.1016/j.apsusc.2012.04.159⟩. ⟨hal-00748889⟩

  • Article dans une revue

The influence of C1 and C2 organic reducing agents on catalytic properties of Co(II)-single site BEA zeolite in SCR of NO

Janusz Janas, Wojciech Rojek, Stanislaw Dzwigaj

CoSiBEA zeolite with 0.9 wt.% Co is prepared in acidic (pH = 2.5) condition by a two-step postsynthesis method which allows to incorporate cobalt into framework zeolite as isolated tetrahedral Co(II) species, as evidenced by XRD and diffuse reflectance UV-vis. As obtained Co(II)-single site zeolite…

Catalysis Today, 2012, 191, pp.32-37. ⟨10.1016/j.cattod.2012.03.004⟩. ⟨hal-00744302⟩

  • Article dans une revue

Elaboration of antibiofilm materials by chemical grafting of an antimicrobial peptide

Jean-Fabrice Yala, Pascal Thebault, Arnaud Hequet, Vincent Humblot, Claire-Marie Pradier, Jean-Marc Berjeaud

A peptide antibiotic, gramicidin A, was covalently bound to cystamine self-assembled monolayers on gold surfaces. Each step of the surface functionalization was characterized by polarization modulation infrared reflection absorption spectroscopy and X-ray photoelectron spectroscopy. The…

Applied Microbiology and Biotechnology, 2011, 89 (3), pp.623-634. ⟨10.1007/s00253-010-2930-7⟩. ⟨hal-00602954⟩

  • Article dans une revue

Aerosol-assisted self-assembly of hybrid Layered Double Hydroxide particles into spherical architectures

Vanessa Prevot, Claire Szczepaniak, Maguy Jaber

Acetate intercalated NiAl-Layered Double Hydroxide nanoparticles were prepd. by polyol process and further used as building blocks to form hybrid LDH spheres by a spray drying technique. The spherical aggregated LDH particles display a polydispersed size with a diam. ranging from 47 nm to 2 μm.…

Journal of Colloid and Interface Science, 2011, 356 (2), pp.566-572. ⟨10.1016/j.jcis.2011.01.051⟩. ⟨hal-00602949⟩

  • 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

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

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⟩