Process for the preparation of novel molecular sieves

A process for the preparation of novel crystalline molecular sieves, characterized by an x-ray diffraction pattern as given in Table- 1 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, said process comprising (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, Boron or mixtures thereof to form a gel (ii) heating the resultant gel at a temperature in the range of 100.degree.-200.degree. C. under static or rotatic conditions to form a crystalline material (iii) quenching the resultant crystalline material in water, filtering and washing with deionized water thoroughly, (iv) drying at a temperature in the range of 80.degree.-150.degree. C. for a period ranging between 1-16 hours (v) calcining at a temperature in the range of 400.degree.-550.degree. C. for a period of 12-24 hours to obtain a first composite catalyst having predominantly alkali metal as the monovalent cation.