A process for the preparation of zeolites having CHA framework structure and a composition comprising the molar ratio (n Si02):X203, 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 X203, wherein X is selected from Al, B, Ga, and a mixture of two or more, and at least one source for Si02, at least one organic structure directing agent (SDA) other than Tetramethylammonium hydroxide (TMAOH), acting 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 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 O2):X2O3) where n is in the range of 10 to 50.
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机译：制备具有CHA骨架结构和包含摩尔比（n SiO 2）：X 2 O 3的组合物的沸石的方法，其中X是三价元素，且其中n至少为10，该方法包括（i）制备水包含至少一种X203来源的溶液，其中X选自Al，B，Ga和两种或多种的混合物，以及至少一种Si02来源，至少一种除四甲基氢氧化铵以外的有机结构导向剂（SDA）用作CHA结构模板的（TMAOH）和四甲基氢氧化铵（TMAOH），其中SDA或其混合物的使用量应使（i）中的水溶液的SDA：TMAOH摩尔比为0.01至5; （ii）根据（i）的水溶液的水热结晶;其中（i）的水溶液包含小于0.005 Cu：（（（n O2）：X2O3）的铜，其中n在10至50的范围内。
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