Laboratoire de réactivité de surface

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  • Article dans une revue

Active Site Design in a Core-Shell Nanostructured Catalyst for a One-Pot Oxidation Reaction

Shusuke Okada, Kohsuke Mori, Takashi Kamegawa, Michel Che, Hiromi Yamashita

Designing an active site: A new type of core-shell structured catalyst was prepared, with a uniform SiO2 core supporting Pd nanoparticles (NPs) covered with a Ti-containing mesoporous silica shell. Generated H2O2 on the inner Pd NP site could interact with the Ti oxide moieties within the mesopores…

Chemistry - A European Journal, 2011, 17 (33), pp.9047-9051. ⟨10.1002/chem.201101241⟩. ⟨hal-00663357⟩

  • 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

Advances in the preparation of supported gold catalysts: Mechanism of deposition, simplification of the procedures and relevance of the elimination of chlorine

Antoine Hugon, Nadia El Kolli, Catherine Louis

The paper focuses on the chem. mechanisms involved during the prepn. of gold catalysts supported on alumina and titania and on attempts to simplify the procedures of prepn. Three methods involving the same gold loading (1 wt%) and the same precursor, HAuCl4, were studied: impregnation in excess of…

Journal of Catalysis, 2010, 274 (2), pp.239-250. ⟨10.1016/j.jcat.2010.07.008⟩. ⟨hal-00604725⟩

  • Article dans une revue

Investigation of oxide catalysts activity in the NOx neutralization with organic reductants

W. Turek, A. Plis, Patrick da Costa, A. Krzton

Temp.-programmed desorption of NO (TPD) and temp.-programmed redn. of NO by propene and ethanol (TPSR) over the catalyst with redox properties and the structure of spinels - Co3O4 and CoFe2O4 - were investigated. The TPD expts. can det. the temp. range in which the deNOx proceeds and provide…

Applied Surface Science, 2010, 256 (17), pp.5572-5575. ⟨10.1016/j.apsusc.2009.12.149⟩. ⟨hal-00604810⟩

  • Article dans une revue

Basic reactivity of CaO: investigating active sites under operating conditions

Hugo Petitjean, Celine Chizallet, Jean-Marc Krafft, Michel Che, Helene Lauron-Pernot, Guylene Costentin

A set of CaO samples was prepared from thermal decomposition of several precursors, leading to very different surface properties. During storage, CaO samples rehydrated quickly but reversibly. Before characterization, the samples were pre-treated at 1023 K under nitrogen flow to obtain CaO as the…

Physical Chemistry Chemical Physics, 2010, 12 (44), pp.14740-14748. ⟨10.1039/c0cp00855a⟩. ⟨hal-00604790⟩

  • Article dans une revue

Probing acid-base sites in vanadium redox zeolites by DFT calculation and compared with FTIR results

Frederik Tielens, Stanislaw Dzwigaj

Ab initio periodic DFT calculations in combination with experimental FTIR of adsorption pyridine investigations have been used to study the acid-base properties of vanadium doped zeolite materials. It is evidenced that VO-H groups of V(V) and V(IV) framework sites are more acidic than SiO-H groups…

Catalysis Today, 2010, 152 (1-4), pp.66-69. ⟨10.1016/j.cattod.2009.09.006⟩. ⟨hal-00604806⟩

  • 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

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

Vibrational and electrical investigations of a uniaxially stretched polystyrene/carbon nanotube composite

Liliane Bokobza, Gilles Garnaud, Patricia Beaunier, Jean-Luc Bruneel

Multiwall carbon nanotube (MWCNT)/polystyrene (PS) composite materials were prepared in the absence and in the presence of a surfactant. TEM analysis reveals the formation of chains made of several nanotubes tied up together upon application of the surfactant while an almost random distribution is…

Vibrational Spectroscopy, 2013, 67, pp.6-13. ⟨10.1016/j.vibspec.2013.03.002⟩. ⟨hal-00914572⟩

  • Article dans une revue

Self-Organization and/or Nanocrystallinity of Co Nanocrystals Effects on the Oxidation Process Using High-Energy Electron Beam

Ana Cazacu, Claudio Larosa, Patricia Beaunier, Guillaume Laurent, Paolo Nanni, Liliana Mitoseriu, Isabelle Lisiecki

The enhanced stability of Co nanocrystals (NCs) when they are highly ordered at both nanometer and micrometer scales is reported. For the first time, it is shown that both the crystalline structure of Co nanoparticles (NPs) and their 2D hexagonal organization have a significant impact on the…

Advanced Functional Materials, 2014, 24 (1), pp.164-170. ⟨10.1002/adfm.201301465⟩. ⟨hal-01078026⟩