Method for synthesizing Cu-SSZ-13 molecular sieve catalyst by one step

The invention relates to a method for synthesizing Cu-SSZ-13 molecular sieve catalyst by one step. The method is characterized by comprising the following steps: (1) mixing an organic amine template agent and deionized water; adding or not adding an NaOH aqueous solution; adding Cu-TEPA clathrate, and stirring evenly; adding an aluminum source and a silicon source, and stirring until all materials are mixed evenly; (2) placing a mixed solution obtained in step (1) into a stainless reaction still with a tetrafluoroethylene or para-polyphenylene lining; crystallizing the reaction still for 12 hours to 6 days at 100 to 200 DEG C.; (3) washing a crystallized product for a plurality of times until the solution is neutral; drying the obtained solid product in a drying oven for 5 to 12 hours at 60 to 150 DEG C; heating the dried solid to 500 to 600 DEG C. and roasting for 3 to 10 hours so as to obtain the Cu-SSZ-13 molecular sieve catalyst product. By adopting the method disclosed by the invention, the use amount of the N,N,N-trimethyl-1-ammonium adamantane template agent is greatly reduced, and the alkali metal ion content of the product is controlled, so that the hydrothermal aging property of the catalyst is optimized.