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<dc:title xml:lang="fr">Optimisation des propriétés de la zéolithe ZSM5 par des ions métalliques de faible valence en vue d'une application aux réactions catalytiques MTO</dc:title>
<dcterms:alternative xml:lang="en">Optimisation of ZSM-5 zeolite properties by low valence metal ions for application in MTO catalytic reaction</dcterms:alternative>
<dc:subject xml:lang="fr">ZSM-5</dc:subject>
<dc:subject xml:lang="fr">Modification cationique</dc:subject>
<dc:subject xml:lang="fr">Cations métalliques</dc:subject>
<dc:subject xml:lang="fr">Acidité</dc:subject>
<dc:subject xml:lang="fr">Cristallinité</dc:subject>
<dc:subject xml:lang="fr">MTO</dc:subject>
<dc:subject xml:lang="fr">Oléfines légères</dc:subject>
<dc:subject xml:lang="fr">Stabilité catalytique</dc:subject>
<dc:subject xml:lang="en">ZSM-5</dc:subject>
<dc:subject xml:lang="en">Cation modification</dc:subject>
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<dc:subject xml:lang="en">Crystallinity</dc:subject>
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<dc:subject xml:lang="en">Light olefin selectivity</dc:subject>
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<dcterms:abstract xml:lang="fr">Cette thèse étudie la modification de la zéolithe ZSM-5 par des cations métalliques à faible valence afin d’ajuster sa structure et son acidité dans la réaction MTO, et ainsi améliorer la sélectivité en oléfines légères et la stabilité catalytique. Les effets de Li+, Na+, K+, Mg2+, Ca2+ et Cu2+ ont été analysés en fonction de la teneur en aluminium. Li+ augmente la stabilité, réduit les transferts d’hydrogène et améliore la sélectivité, tandis que Na+ renforce la cristallinité. Parmi les cations alcalino-terreux, Mg2+ transforme les sites acides forts en sites plus faibles, prolongeant nettement la durée de vie. L'effet de Ca2+ dépend du taux d'aluminium, alors que Cu2+ diminue de manière excessive l’acidité. L’étude montre que le choix du cation permet de moduler finement les propriétés de ZSM-5 et d’optimiser ses performances en MTO.</dcterms:abstract>
<dcterms:abstract xml:lang="en">This thesis investigates the modification of ZSM-5 zeolites with low-valence metal cations to tune their structure and acidity in the MTO reaction, with the aim of improving light olefin selectivity and catalytic stability. The effects of Li+, Na+, K+, Mg2+, Ca2+ and Cu2+ were evaluated as a function of aluminum content. Li+ enhances structural stability, reduces hydrogen-transfer reactions and improves selectivity, while Na+ increases crystallinity. Among alkaline-earth metals, Mg2+ converts strong acid sites into weaker ones, significantly extending catalyst lifetime. The effect of Ca2+ depends on the Al content, whereas Cu2+ excessively reduces acidity. The study shows that the choice of cation allows fine control of ZSM-5 properties and effective optimization of its MTO performance.</dcterms:abstract>
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