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Synthèses assistées par micro-ondes et lumière de nanomatériaux pour la catalyse

Abstract : The main objective of this study was to carry the one step synthesis of metal/oxide heterostructures combining microwave and UV irradiation. During this work, we prepared nanoparticles of high industrial potential oxides (CeO2, TiO2 and SnO2) with a precise control of the size and morphology. Isotropic particles and nanorods of CeO2 were first synthetized. Then, a large variety of anatase and rutile nanoparticles, with specific crystalline faces were obtained. Syntheses of SnO2 were finally developed, without or with HCl, to obtain isotropic and elongated nanoparticles respectively. To understand the fundamental difference between formation mechanisms of SnO2, we performed an in situ study, in our microwave apparatus, combining small angle X-ray scattering and X-ray absorption spectroscopy. We were able to give new insights on the formation of these nanoparticles in aqueous solutions. We developed then the first microwave assisted continuous flow synthesis of SnO2 to produce significant amount of materials. Finally, we used the synthetized TiO2 nanoparticles as support to prepare gold catalysts with two different methods: the deposition-precipitation with urea (DPU) and the photodeposition. DPU provided as active nanocatalysts as equivalent catalysts prepared with commercial TiO2. We highlighted a potential impact of crystalline faces of the support. Finally, the photodeposition method led to similar supported gold nanoparticles size range as the DPU. We proposed preliminaries conclusions on the mechanism of the photodeposition.
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https://tel.archives-ouvertes.fr/tel-03001283
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Submitted on : Thursday, November 12, 2020 - 12:14:58 PM
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  • HAL Id : tel-03001283, version 1

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Lionel Tinat. Synthèses assistées par micro-ondes et lumière de nanomatériaux pour la catalyse. Catalyse. Sorbonne Université, 2019. Français. ⟨NNT : 2019SORUS386⟩. ⟨tel-03001283⟩

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