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ABSTRACT
ABSTRACT
The straightforward... more
The straightforward "dressing" of macroscopically shaped supports (i.e. β-SiC and α-Al2O3) with a mesoporous and highly nitrogen-doped carbon-phase starting from food-processing raw materials is described. The as-prepared composites serve as highly efficient and selective metal-free catalysts for promoting industrial key-processes at the heart of renewable energy technology and environmental protection.
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ABSTRACT
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Nickel sulfide supported on SiC exhibits a very high activity and selectivity for the direct oxidation of H2S into elemental sulfur at low reaction temperature (60°C). The presence of water on the catalyst surface could explain the... more
Nickel sulfide supported on SiC exhibits a very high activity and selectivity for the direct oxidation of H2S into elemental sulfur at low reaction temperature (60°C). The presence of water on the catalyst surface could explain the absence of deactivation even at high sulfur loading of the surface. The chemical inertness of the SiC support allowed any detrimental reactions between
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... 13. N. Keller, C. Pham-Huu, S. Roy, MJ Ledoux, C. Estoum6s and J. Guille, J. Mater. Sci., 34(13) (1999) 3189. 14. PM Ayajart, Chem. ... 13. N. Keller, C. Pham-Huu, S. Roy, MJ Ledoux, C. Estoumès and J. Guille. J. Mater. Sci., 34 13... more
... 13. N. Keller, C. Pham-Huu, S. Roy, MJ Ledoux, C. Estoum6s and J. Guille, J. Mater. Sci., 34(13) (1999) 3189. 14. PM Ayajart, Chem. ... 13. N. Keller, C. Pham-Huu, S. Roy, MJ Ledoux, C. Estoumès and J. Guille. J. Mater. Sci., 34 13 (1999), p. 3189. 14. PM Ayajart. Chem. ...
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The influence of different parameters (temperature, duration and SiO source) on the synthesis of silicon carbide SiC according to the gas-solid reaction between SiO vapors and activated charcoal was investigated. The material obtained... more
The influence of different parameters (temperature, duration and SiO source) on the synthesis of silicon carbide SiC according to the gas-solid reaction between SiO vapors and activated charcoal was investigated. The material obtained retained the general shape of the activated charcoal, which is an advantage because of the difficulty in post shaping SiC, due to the high strength of the
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... Gauthier Wine´*, Marc-Jacques Ledoux, and Cuong Pham-Huu Laboratoire des Materiaux, Surfaces et Procede´s pour la Catalyse (LMSPC), Part of the ELCASS (European Laboratory of Catalysis and Surface ... [18] M. Spagnol, L. Gilbert, H.... more
... Gauthier Wine´*, Marc-Jacques Ledoux, and Cuong Pham-Huu Laboratoire des Materiaux, Surfaces et Procede´s pour la Catalyse (LMSPC), Part of the ELCASS (European Laboratory of Catalysis and Surface ... [18] M. Spagnol, L. Gilbert, H. Guillot and PJ Tirel, US Patent No. ...
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Research Interests: Thermodynamics, Electron Microscopy, Transmission Electron Microscopy, Nanotechnology, Multidisciplinary, and 11 moreNucleation and Growth, Solubility, Metals, Electrons, Rare earth metal oxide nanoparticle, Surface Properties, Transmission Electron Microscope, Small, Electron Beam, Catalytic Activity, and Nanotubes Carbon
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Assemblies of nanoparticles are studied in many research fields from physics to medicine. However, as it is often difficult to produce mono-dispersed particles, investigating the key parameters enhancing their efficiency is blurred by... more
Assemblies of nanoparticles are studied in many research fields from physics to medicine. However, as it is often difficult to produce mono-dispersed particles, investigating the key parameters enhancing their efficiency is blurred by wide size distributions. Indeed, near-field methods analyse a part of the sample that might not be representative of the full size distribution and macroscopic methods give average information including all particle sizes. Here, we introduce temperature differential ferromagnetic nuclear resonance spectra that allow sampling the crystallographic structure, the chemical composition and the chemical order of non-interacting ferromagnetic nanoparticles for specific size ranges within their size distribution. The method is applied to cobalt nanoparticles for catalysis and allows extracting the size effect from the crystallographic structure effect on their catalytic activity. It also allows sampling of the chemical composition and chemical order within the size distribution of alloyed nanoparticles and can thus be useful in many research fields.
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... Jean-Hubert Oliviera, Franck Camerela, Raymond Ziessel*a, Pascal Retailleaub, Julien Amadouc and ... use of piperidine as the base provided, in a regiospecific process, novel doubly alkynylated compounds unambiguously characterized by... more
... Jean-Hubert Oliviera, Franck Camerela, Raymond Ziessel*a, Pascal Retailleaub, Julien Amadouc and ... use of piperidine as the base provided, in a regiospecific process, novel doubly alkynylated compounds unambiguously characterized by NMR correlation experiments ...
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The present study reports the synthesis of supported zeolite with nanoscopic size on the SiC-based composite combining nanoscopic properties, i.e., SiC nanofibers, and macroscopic shaping, i.e., SiC foam with centimeters size. The SiC... more
The present study reports the synthesis of supported zeolite with nanoscopic size on the SiC-based composite combining nanoscopic properties, i.e., SiC nanofibers, and macroscopic shaping, i.e., SiC foam with centimeters size. The SiC nanofibers have been obtained by the transformation of the carbon nanofibers by carburization in the presence of SiO vapour and then the zeolite was deposited on the SiC foam support. The different nature of the support results in different morphologies on zeolite crystal.
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... F. Le Normand* , V. vr ek , A. Senger , T. Dintzer and C. Pham-Huu . IPCMS, UMR 7504 CNRS-University Louis Pasteur, 23, rue du Loess, BP 43, F-67034 Strasbourg Cedex2, France, LMSPC-ECPM, UMR 7515 CNRS ...
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Multi-wall carbon nanotubes are grown in a chemical vapor deposition process by using bulk gold and copper substrates as catalysts. Nanotube growth starts from a nanometer-sized roughness on the metal surfaces and occurs in a mechanism... more
Multi-wall carbon nanotubes are grown in a chemical vapor deposition process by using bulk gold and copper substrates as catalysts. Nanotube growth starts from a nanometer-sized roughness on the metal surfaces and occurs in a mechanism where the catalyst particle is either at the tip (Au) or root (Cu) of the growing nanotube. Whereas Au leads to nanotubes with good structural perfection, nanotubes grown from Cu show a higher density of defects. High-resolution transmission electron microscopy shows the bonding between Au and carbon at the metal-nanotube interface whereas no bonds between Cu and carbon occur. Highly mobile Au or Cu atoms adsorb at the growing edge of a carbon nanotube from where diffusion along the nanotube wall can lead to the formation of Au or Cu nanowires inside the central hollow of carbon nanotubes.
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Beta zeolite supported on silicon carbide, with high thermal conductivity and high mechanical strength, was successfully used as an active and stable catalyst for Friedel-Crafts reactions in a fixed bed configuration.