New Route to Pentasil-Type Zeolites Using a Non Alkaline Medium in the Presence of Fluoride Ions
作者： J.L. Guth , H. Kessler , R. Wey
DOI: 10.1016/S0167-2991(09)60864-8
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摘要: Silica-rich, Al-, B- and (Al + B) MFI zeolites called Zeosilites, Aluzeosilites, Borozeosilites Aluborozeosilites respectively were obtained by hydrothermal crystallization at 60–200°C from mixtures containing F anions tetra-, tri- di-propylamraonium cations as templates; pH values 3–10. Crystal size is a function of the Si substitution degree, it may reach 800 um in some cases. DSC, DTA TG curves corresponding to decomposition templates occluded fluoride salts are different those observed for samples alkaline medium. Mass spectrometer analysis shows that presence as-synthesized leads organic fluro compounds formation on calcination. High resolution 29 si-, 27 Al- 11 B magic angle spinning NMR evidences Al zeolite framework.
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