Patent ID: 8206683

Claim:
A method for synthesizing an all-silica zeolite beta having an average crystal size of less than 5 μm, comprising the following steps: forming a reaction mixture comprising a source of silicon dioxide (SiO 2 ), a source of fluoride ions (F − ), a source of tetraethylammonium cations (TEA + ), and water (H 2 O), the reaction mixture having a composition expressed in terms of mole ratios in the following ranges: F − /SiO 2 =0.33 to 3.0 TEA + /SiO 2 =0.3 to 1.0 H 2 O/SiO 2 =1.5 to 6.0 F − /TEA + =1.1 to 3.0 (b) maintaining the reaction mixture under conditions sufficient to form crystals of the all-silica zeolite beta; and (c) recovering the crystals of the all-silica zeolite beta, wherein the pH of the mixture before crystallization is in the range from 6 to 9, and the pH of the mixture after completion of crystallization is in the range from 6 to 8.