Method of preparing a novel platelet-type crystalline form of synthetic faujasite

Claim 1

In a process for preparing synthetic faujasite type zeolites wherein amorphous aluminosilicate zeolite nucelation centers having a particle size of below 0.1 microns are combined with a zeolite producing reaction mixture which contains alumina, silica, alkali metal hydroxide and water, and the mixture is heated to obtain faujasite type zeolite crystals, the improvement comprising: (a) preparing a reaction mixture containing the following mol ratios of ingredients: Na 2 O/SiO 2 --0.3 to 9 SiO 2 /Al 2 O 3 --3 to 25 H 2 O/Na 2 O--12 to 90 K 2 O/Al 2 O 3 --0.05 to 1.2 (b) adding to said mixture amorphous aluminosilicate zeolite nucleation centers having a particle size of below 0.1 microns, consisting essentially of the following range of composition: Na 2 O--12 to 20 SiO 2 --14 to 19 Al 2 O 3 --0.75-5 H 2 O--100 to 600 (c) heating the reaction mixture at a temperature of 40° to 150° C. for a period of about 10 minutes to 30 hours to obtain a faujasite type zeolite product wherein greater than about 5 percent by weight of the crystals comprising said product are characterized by a platelet flattened octahedron shape.