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Theses

Synthèse de nanocristaux de zéolithe Y stabilisés en absence d'agent organique structurant

Abstract : The fractionated distillation of crude oil is not sufficient to cover all the fuel needs and produces large amounts of long chain carbon distillates (C20-C50). Thus, these hydrocarbons are transformed into lighter hydrocarbon molecules by two processes: fluid catalytic cracking or hydrocracking. The latter allows the selective cracking of hydrocarbons essentially in gas oil and kerosene. The acid catalysts used are “bifunctional”: a zeolite matrix USY (ultra-stabilized zeolite Y) performs the hydrocarbons cracking, at the same time a sulfide or a noble metal catalyzes hydrogenation and dehydrogenation reactions. The aim of this work is to maximize the selectivity to middle distillates by decreasing the residence time of hydrocarbon molecules in the zeolite framework. For this, it was chosen to directly synthesize zeolite Y nanocrystals with the highest possible Si/Al ratio, in a SDA-free medium. This property gives them a better stability during the post-treatments essential to reach the Si/Al ratio of the currently used USY zeolite. Thanks to a new synthesis strategy, nanocrystals between 20 and 90 nm with a Si/Al ratio varying from 2.2 to 2.6 were obtained. Then, the protonated form of these nanocrystals (90 nm) was studied and acidity measurements were also carried out.
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Maëva Borel. Synthèse de nanocristaux de zéolithe Y stabilisés en absence d'agent organique structurant. Matériaux. Université de Haute Alsace - Mulhouse; Université de Strasbourg (2009-..), 2017. Français. ⟨NNT : 2017MULH0718⟩. ⟨tel-02361664⟩

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