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Synthèse de matériaux nano structurés dans des solvants non aqueux

Abstract : Two major challenges are particularly important for current research in the catalytic materials synthesis: preparation of finely divided particles and control of their shape. In this work we used non aqueous solvents to prepare catalytic materials containing transition metals oxides (Ti, Mn, Zr). Three techniques were applied to prepare TiO2-based solids. Reactions in molten alkali metal nitrates doped with different anions offered good control of textural properties and of the nature of exposed facets of nanocrystalline particles. Synthesis in molten ammonium nitrate stabilized with organic nitrogen-containing compounds provided TiO2 solids with variable size and shape as a function of stabilizer used. The reflux treatment in polar organic solvents leads to titania supports having high specific surface area. Two reactions from the field of photocatalysis were employed to valorize the obtained catalysts: H2 production by methanol dehydrogenation and photocatalytic oxidation of formic acid. Isopropanol decomposition has been used to determine the acid-base properties of the solids. Molten nitrate technique was then successfully applied in order to obtain in one-step highly dispersed Mn-Zr and Mn-Ti supported oxide catalysts. These systems showed excellent activity for the total oxidation of volatile organic compounds (VOC).
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  • HAL Id : tel-00809196, version 1

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Monica Raciulete. Synthèse de matériaux nano structurés dans des solvants non aqueux. Autre. Université Claude Bernard - Lyon I, 2010. Français. ⟨NNT : 2010LYO10202⟩. ⟨tel-00809196⟩

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