The invention relates to a synthesis of a
molecular sieve and aims to provide a method for synthesizing a silicoaluminophosphate
molecular sieve by the use of a
metal-amine-complex as a template agent. The method provided by the invention comprises the following steps of: adding
boehmite or
aluminium hydroxide into deionized water, adding dropwisely
phosphoric acid with stirring, and adding
amorphous silica; successively adding a
divalent metal salt and organic amine after uniformly mixing to make the PH value of a gel to reach 7-9, stirring at
room temperature for 12 hours, placing into a reaction vessel for a
crystallization reaction, washing a
solid crystal product to a neutral one, and
drying to obtain a
molecular sieve powder. According to the invention, different
metal ions can be introduced so as to adjust the acidity of the SAPO-34 molecular
sieve; And the metal ions in the obtained molecular
sieve can be dispersed uniformly and the metal ions can be introduced in larger amounts; in addition, the molecular
sieve has higher specific surface area and has a high reaction activity in a catalytic reaction. The synthesis method provided by the invention requires a simple template agent and low cost, the
crystallization temperature is controlled from 150 DEG C to 200 DEG C, and a method for removing the template agent is simple and easy to operate.