Process for the preparation of novel molecular sieves

Abstract

There is described a process for the preparation of novel crystalline molecular sieves, characterized by a distinctive x-ray diffraction pattern and a chemical composition in terms of mole ratios of oxides in the anhydrous state by the formula aX.sub.2 O:bM.sub.2 O.sub.3 :cSiO.sub.2 where X is a mixture of monovalent cation selected from the group consisting of alkali metal, ammonium and hydrogen, M is selected from Al, B, Fe, Ga, Cr or mixtures thereof and a=0.0 to 1.0, b=0.0 to 1.0 and c=20 or above. The process includes (i) mixing a source of silicon with (a) a source of alkali metal, (b) an organic compound containing nitrogen selected from the group consisting of hexamethylene bis trialkyl ammonium, salts of hexamethylene bis trialkyl ammonium and mixtures thereof, and (c) optionally, a source of Al, Fe, Ga, B, Cr, or mixtures thereof to form a gel, (ii) heating the resultant gel to form a crystalline material, (iii) quenching the resultant crystalline material in water, filtering, and washing with deionized water thoroughly, (iv) drying, and (v) calcining to obtain a composite catalyst.