Patent ID: 9579637
Date: 2017-02-28
CPC Classifications: B01J,C01B,C07C,C10G,Y02P

Claim:
1. A synthesis method for a SAPO-34 molecular sieve, the method comprising: a) formulating an initial gel mixture for synthesizing SAPO-34 molecular sieve; b) adding a pore size modifier into the initial gel mixture obtained in step a) and stirring; c) sealing the gel mixture obtained in step b) and heating the gel mixture obtained in step b) to crystallization temperature, and performing a crystallization step comprising thermostatic crystallization of the gel mixture obtained in step b) under autogenous pressure, and separating a solid product after the crystallization is completed, and washing the solid product to be neutral, and drying the washed solid product, and thus obtaining as-synthesized SAPO-34 molecular sieve; and d) calcining the as-synthesized SAPO-34 molecular sieve obtained in step c) in air to remove the organics contained in the material, and obtaining a SAPO-34 molecular sieve having both micropores and mesopores; wherein the oxide molar proportions of all components in said initial synthesis gel mixture are: said pore size modifier is one or more selected from the group consisting of aqueous ammonia, tetramethylammonium hydroxide, diethylamine, tripropylamine, di-n-propylamine, n-propylamine, n-butylamine, cyclohexylamine and a mixture thereof; and