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  1. No Access

    Chapter and Conference Paper

    Application de la RPE à la Charactérisation d’un Matériau Fossile: le Charbon

    Le Charbon est un matériau complexe contenant une composante organique et une composante minérale. La RPE peut fournir des renseignements sur ces deux composantes. L’étude des ions paramagnétiques présents dan...

    B. Nickel-Pepin-Donat, A. Jeunet, A. Rassat… in Electron Spin Resonance (ESR) Applications… (1992)

  2. No Access

    Article

    57Fe NGR studies on three-stage hydroliquefaction of coals

    Iron Mössbauer spectroscopy has been performed on liquefaction residues of two different French coals. In a three-stage liquefaction of high volatile bituminous coal (Freyming), without an added catalyst, the ...

    M. Jamond, R. Bacaud, P. Bussiere, H. Charcosset… in Hyperfine Interactions (1990)

  3. No Access

    Article

    On the occurrence and role of SnO2, SnS and FeSn2 in coal hydroliquefaction experiments using tin-based catalysts

    Mössbauer Spectroscopy, X-Ray Diffraction and Electron Microscopy were applied to the study of solid residues of coal hydroliquefaction, for which tin-based catalysts were used. In the general case hydroliquef...

    R. Bacaud, M. Besson, D. Brodzki, P. Bussière, H. Charcosset… in Hyperfine Interactions (1989)

  4. No Access

    Article

    Mössbauer study of some aspects of coal hydroliquefaction process

    Solid residues of hydroliquefaction of Freyming coal exhibit NGR spectra from which it is mainly stated that in a temperature range around 673 K the efficiency of Fe2O3 catalysts results from their ability to giv...

    A. Newman, P. Bussiere, M. Besson, H. Charcosset in Hyperfine Interactions (1986)

  5. No Access

    Article

    Measurement of the dispersity of supported ruthenium catalysts by oxygen chemisorption

    A highly dispersed (Ø (Ru)<10 Å, from electron microscopy) Al2O3-supported catalyst and not so well dispersed silica supported Pt, Ru, Pt, Ru-alloy catalysts were investigated. Oxygen coverage of Ru is found to b...

    G. Blanchard, H. Charcosset in Reaction Kinetics and Catalysis Letters (1980)

  6. No Access

    Article

    Platinum-iridium alloys supported by α-alumina. Dispersity and catalytic properties in n-heptane conversion

    Stable (Pt,Ir) solid solutions, 100 to 200 Å in particle size, were obtained although the corresponding bulk phases are not stable. Ir prevents the sintering of metal particles and alumina reduction to Al duri...

    H. Charcosset, R. Fréty, G. Leclercq… in Reaction Kinetics and Catalysis Letters (1979)

  7. No Access

    Article

    Determination of the dispersity of supported platinum catalysts by hydrogen, oxygen or carbon monoxide chemisorption and hydrogen-oxygen titrations, using volumetric, gravimetric and catharometric techniques

    The dispersity of supported Pt catalysts is measured with better exactness by means of O2 (one atom O per surface Pt atom, Pts), or CO (one CO molecule per Pts) chemisorption; among the three techniques, the volu...

    R. Bacaud, G. Blanchard, H. Charcosset… in Reaction Kinetics and Catalysis Letters (1979)

  8. No Access

    Article

    Etude de l'incorporation de l'oxyde de cuivre dans le reseau de l'oxyde de nickel par traitement thermique

    NiO prepared at 950° has been impregnated with a solution of copper nitrate and heated at 300°. The incorporation of CuO issued from this treatment in the lattice of NiO during sintering at 450–1100° has been ...

    P. Grange, H. Charcosset, Y. Trambouze in Journal of thermal analysis (1969)