FremgangsmÕte for fremstilling av heksagonal faujasitt med lavt forbruk av organisk tilsetningsstoff, samt anvendelse av denne som katalysator ved alkylering

The invention relates to a method of preparing a hexagonal faujasite consisting of small plate formed crystals with a thickness of less than 0.3 microns and a width of less than 1.3 microns, by adding to a reaction mixture comprising SiO2, Al2O3 and Na2O, an amount of 18 crown ether to achieve a molar ratio of 18 crown ether to Al of less than 0.1, thereafter keeping the mixture at room temperature for 1 to 3 days and then at a temperature of between 80 and 105 DEG C for at least 15 days, the container being rotated "head over" during the whole period, thereafter recovering the crystalline product formed in an appropriate way. The reaction mixture has the composition, on a molar basis, of 10.5-11.5 SiO2; Al2O3; 2-3 Na2O; 120-160 H2O; 0.11-0.199 C12H24O6 wherein C12H24O6 is added in the form of 18 crown ether. The invention also relates to the use of the hexagonal faujasite prepared in accordance with the above as an alkylation catalyst, especially in the alkylation of aliphatic compounds, particularly as a catalyst in the alkylation of iso-butane with 2-butene.