Process for the preparation of crystalline silicates, crystalline silicates so prepared and process for carrying out catalytic reactions

摘要

Process for the preparation of ZSM-5 type crystalline aluminium silicates. An aqueous mixture containing a compound of an alkali metal (M), a quaternary alkyl ammonium compound (R₄NX), a silicon compound that after drying at 120°C and calcination at 500°C yields a product with an Si0₂ content of more than 90% by weight, and an aluminium compound in which mixture the various compounds are present in the specific molar ratios, is maintained at elevated temperature until the crystalline silicate is formed which is separated, dried and calcined.