Etude physico-chimique d'oxydes mixtes issus d'hydroxydes doubles lamellaires. Application à la synthèse de nanofilaments de carbone.

Abstract : The Lamellar Double Hydroxides (LDH) have many uses because of their lamellar structure and the diversity of their composition. This work underlines the potentialities of the LDH when they are used as mixed oxides precursor being able to be active in acido-basic or oxydo-reduction catalysis.
The first part relates to the study of a series of oxides containing nickel, copper, magnesium and aluminium, obtained by calcination of the parent LDH at 450°C. The detailed structural characterization and the study of the acido-basicity of mixed oxides, according to their composition, was carried out. These studies are based on the use of various complementary physico-chemical methods giving informations about the structure, the composition and the morphology of the prepared oxides crystals (XRD, TGA, chemical analyses, XPS...), or they allow the knowledge of their acido-basic properties (adsorption of molecules probes followed by microcalorimetry and XPS experiments).
The second part of the report is devoted to the use of mixed oxides obtained after calcination at 800°C for the synthesis of carbon nanofilaments obtained from the catalytic decomposition of methane. After a detailed study of the used mixed oxides, the produced carbon nanofilaments were characterized using various analytical techniques, particularly the transmission electronic microscopy. The physico-chemical data obtained have highlighted the relations between the characteristics of the used catalyst (composition, synthesis mode, properties...) and the type (nature and texture) of the obtained carbon nanofilaments (tubes, fibers).
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Submitted on : Monday, October 5, 2009 - 11:16:13 AM
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Laurent Dussault. Etude physico-chimique d'oxydes mixtes issus d'hydroxydes doubles lamellaires. Application à la synthèse de nanofilaments de carbone.. Matériaux. Université de Pau et des Pays de l'Adour, 2005. Français. ⟨tel-00421914⟩

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