| 摘要 |
The subject of the present invention is a process for the preparation of silica-based zeolites of MFI structure, characterised in that it comprises the following stages: (i) - the preparation of a homogeneous aqueous reaction mixture containing: . a silicon source in the form of a fluorinated complex, . a chemical agent (Mod) which provides OH<-> ions by hydrothermal decomposition under the reaction conditions, . a structuring agent (Str) which directs and stabilises the formation of the zeolite. (ii) - the heating of this reaction mixture to a temperature of at least 120 DEG C, leading to the formation of a precipitate which is then separated, (iii) - the calcination of the said precipitate in order to remove the structuring agent occluded in the channels.
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