Patent ID: 8883119

Claim:
A process for the preparation of zeolites having CHA framework structure and a composition comprising the molar ratio (n SiO 2 ):X 2 O 3 , wherein X is a trivalent element, and wherein n is at least 10, the process comprising: (i) preparation of an aqueous solution containing: at least one source for X 2 O 3 , wherein X is selected from Al, B, Ga, and a mixture of two or more, at least one source for SiO 2 , at least one organic structure directing agent (SDA) other than Tetramethylammonium hydroxide (TMAOH) as a template for the CHA structure, and Tetramethylammonium hydroxide (TMAOH), wherein the SDA or mixtures thereof are employed in such amounts that the aqueous solution in (i) exhibits a molar ratio of SDA:TMAOH in the range of 0.01 to 5; (ii) hydrothermal crystallization of the aqueous solution according to (i); wherein the aqueous solution of (i) contains copper in an amount less than 0.005 Cu:((n SiO 2 )+X 2 O 3 ) where n is at least 10.