Laboratoire de réactivité de surface

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  • Article dans une revue

On the kinetics of CO oxidation by O2 over RhI(CO)2 catalytic species anchored to a zeolitic support

Céline Fontaine-Gautrelet, Cyril Thomas, Jean-Marc Krafft, Gérald Djéga-Mariadassou

The reactivity of RhI(CO)2 towards CO oxidation was studied on a model Rh(0.7 wt%)/HY material. The kinetic results show that RhI(CO)2 exhibit a fairly low activity. It is therefore suggested that the catalytic species responsible for the enhanced activity of Rh/Ce0.68Zr0.32O2 [Manuel et al., J.…

Topics in Catalysis, 2007, 42-43, pp.357-361. ⟨10.1007/s11244-007-0205-z⟩. ⟨hal-00157007⟩

  • Article dans une revue

On the clarification of the IR stretching vibration assignment of adsorbed N2 on Rh0 and Rhd+ surface atoms of supported Rh crystallites

Céline Fontaine-Gautrelet, Jean-Marc Krafft, Gérald Djéga-Mariadassou, Cyril Thomas

The low temperature adsorption of N2 on Rh/SiO2 samples of various particle-size distributions was followed by FTIR. The addition of O2 pulses on Rh0 surfaces saturated with chemisorbed N2 allowed us to reassign stretching frequencies attributed originally to N2-Rh0 to N2-RhΔ+. The formation of the…

Journal of Physical Chemistry B, 2006, 110, pp.10075-10081. ⟨10.1021/jp061077y⟩. ⟨hal-00079961⟩

  • Article dans une revue

Effect of water on cobalt speciation during solid-state synthesis of Co2+/ZSM5 catalysts: quantitative study by TPR and XAS

Eric Marceau, Michel Che, Françoise Villain, Younès Ben Taarit

The effect of water on cobalt speciation in the synthesis of Co2+/ZSM5 catalysts is quantitatively studied by the combined use of macroscopic and local characterization techniques, TPR and X-ray absorption spectroscopies, respectively. The addition of a small quantity of water to cobalt acetate and…

Microporous and Mesoporous Materials, 2006, 93, pp.62-70. ⟨10.1016/j.micromeso.2006.02.004⟩. ⟨hal-00109394⟩

  • Article dans une revue

ADSORPTION ON STAINLESS STEEL SURFACES OF BIOSURFACTANTS PRODUCED BY GRAM-NEGATIVE AND GRAM-POSITIVE BACTERIA : CONSEQUENCE ON THE BIOADHESIVE BEHAVIOR OF PATHOGENIC STRAINS.

Thierry Meylheuc, Christophe Méthivier, Margareth Renault, Jean-Marie Herry, Claire-Marie Pradier, Marie-Noëlle Bellon-Fontaine

The ability of adsorbed biosurfactants (Pf and Lb) obtained from gram negative bacterium (Pseudomonas fluorescens) or gram positive bacterium (Lactobacillus helveticus) to inhibit adhesion of four listerial strains to stainless steel was investigated. These metallic surfaces were characterized…

Colloids and Surfaces B: Biointerfaces, 2006, 52 (2), pp.146-155. ⟨10.1016/j.colsurfb.2006.04.016⟩. ⟨hal-00111667⟩

  • Article dans une revue

Optimized grafting of antimicrobial peptides on stainless steel surface and biofilm resistance tests

Arnaud Hequet, Vincent Humblot, Jean-Marc Berjeaud, Claire-Marie Pradier

Antibacterial peptides, magainin I and nisin were covalently bound to stainless steel surfaces. Several procedures of surface functionalisation processes have been investigated and optimized, each step being characterized by polarization modulation reflection absorption infrared spectroscopy (PM-…

Colloids and Surfaces B: Biointerfaces, 2011, 84 (2), pp.301-309. ⟨10.1016/j.colsurfb.2011.01.012⟩. ⟨hal-00602940⟩

  • Article dans une revue

Study of the use of fluidized bed plasma reactors for the treatment of alumina supported palladium catalyst: Application for SCR NOx by CH4 in stationary sources

Marjorie Foix, Cedric Guyon, Michael Tatoulian, Patrick da Costa

Calcination is an important step in catalyst synthesis. This work examd. plasma treatment as an alternative to calcination, since it is a more energy efficient process. A radio frequency, fluidized bed plasma reactor was used for the pretreatment process with different gas mixts. (Ar and Ar/O2…

Catalysis Communications, 2010, 12 (1), pp.20-24. ⟨10.1016/j.catcom.2010.05.022⟩. ⟨hal-00604716⟩

  • Article dans une revue

Insight into the structure and localization of the titania overlayer in TiO2-coated SBA-15 materials

Fu-Xiang Zhang, Xavier Carrier, Jean-Marc Krafft, Yu-Ji Yoshimura, Juliette Blanchard

Titania-coated SBA-15 materials (Ti-SBA-n with n = 1-4) were synthesized by successive grafting of titanium isopropoxide in iso-propanol. The investigation of the nature and localization of the TiO2 overlayer allowed us to conclude that there was formation of very small (UV-visible, EXAFS, XANES),…

New Journal of Chemistry, 2010, 34 (3), pp.508-516. ⟨10.1039/B9NJ00439D⟩. ⟨hal-00604815⟩

  • Article dans une revue

Polyol synthesis and magnetic study of Mn3O4 nanocrystals of tunable size

Lorette Sicard, Jean-Marc Le Meins, Christophe Methivier, Frederic Herbst, Souad Ammar

Nanosized manganese oxide particles were prepd. by the so-called polyol process. The av. diam. of the particles was controlled by the growth time. XRD, TEM and x-ray photon spectroscopy (XPS) show that the particles are well crystd., pure, stoichiometric Mn3O4 single crystals of uniform size…

Journal of Magnetism and Magnetic Materials, 2010, 322 (18), pp.2634-2640. ⟨10.1016/j.jmmm.2010.03.016⟩. ⟨hal-00604799⟩

  • Article dans une revue

Detailed crystal chemistry and iron topochemistry of asbestos occurring in its natural setting: A first step to understanding its chemical reactivity

A. Pacella, G. B. Andreozzi, Jeanine Fournier

Five samples of tremolite asbestos from Italy and USA were fully characterized by ICP-MS, SEM, EMPA, FT-IR, MS, XRPD, to correlate crystal chemistry with chemical reactivity. Iron topochemistry was investigated in detail, due to the role of Fe in the aetiology of respiratory inflammatory diseases.…

Chemical Geology, 2010, 277 (3-4), pp.197-206. ⟨10.1016/j.chemgeo.2010.07.018⟩. ⟨hal-00604789⟩

  • Article dans une revue

Bioengineering of stainless steel surface by covalent immobilization of enzymes. Physical characterization and interfacial enzymatic activity

Anne Caro, Vincent Humblot, Christophe Methivier, Michel Minier, Lucica Barbes, Joachim Li, Michele Salmain, Claire-Marie Pradier

Two hydrolytic enzymes, namely lysozyme and trypsin, were covalently immobilized onto stainless steel surfaces using wet chemistry processes. The immobilization strategy took advantage of the spontaneous physisorption of the polymer poly(ethylene imine) (PEI) onto stainless steel to yield a firmly…

Journal of Colloid and Interface Science, 2010, 349 (1), pp.13-18. ⟨10.1016/j.jcis.2009.12.001⟩. ⟨hal-00604709⟩