Synthesis of Zeolites in the Presence of Diquaternary Alkylammonium Ions as Structure-Directing Agents

Abstract : This paper deals with the synthesis results obtained mostly from pure silica systems in the presence of (CH3)3N+(CH2)nN+(CH3)3 ions (n = 5, 6, 9 or 10) in fluoride media, but also in the presence of (CH3)3N+(CH2)nO(CH2)nN+(CH3)3 ions (n = 2 or 4) in hydroxide or fluoride media. A variety of zeolites form, namely ZSM-48, MTW-type, BEA-type, MFI-type, ITH-type zeolites, but also, in case of pronounced degradation of the template into N(CH3)4+ or N(CH3)3, AST-type, MTN-type and RUT-type materials. The samples are characterized by XRD, SEM, thermal and elementary analyses, 1H liquid NMR (after dissolution of the sample in HF aqueous solution) and solid-state NMR (19F, 13C, 27Al) spectroscopy.
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P. Caullet, J.-L. Paillaud, Y. Mathieu, N. Bats. Synthesis of Zeolites in the Presence of Diquaternary Alkylammonium Ions as Structure-Directing Agents. Oil & Gas Science and Technology - Revue d'IFP Energies nouvelles, Institut Français du Pétrole, 2007, 62 (6), pp.819-825. ⟨10.2516/ogst:2007079⟩. ⟨hal-02005772⟩

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