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- W2493720189 abstract "Replacement of OH- by F- makes it possible to obtain zeolites in media where pH values can be lowered to acidic ones. Under such conditions MFI-, FER-, MTT-, MTN- and TON-structure type materials could be prepared. This route is especially suited for high-silica materials synthesis, but partial substitution of silicon by BIII, AlIII, GaIII, FeIII, GeIV and TiIV has been possible too. The ease of substitution decreases with increasing stability of the corresponding fluorocomplezes in the solution. As the supersaturation of crystallizing species is lower for fluoride-containing media, the number of phases that could be obtained is smaller (fewer metastable phases), but crystallization is more regular (formation of large crystals with less defects). The choice of templates is therefore more critical. The new medium enables the incorporation of elements sparingly soluble in alkaline solutions (e.g., FeIII) or of cations such as NH4+, Co2+. Finally the presence of F in the materials leads to catalytic properties modifications which will be discussed." @default.
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- W2493720189 date "1989-07-31" @default.
- W2493720189 modified "2023-10-16" @default.
- W2493720189 title "Zeolite Synthesis in the Presence of Fluoride Ions" @default.
- W2493720189 doi "https://doi.org/10.1021/bk-1989-0398.ch013" @default.
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