Synthesis method of high-crystallinity beta molecular sieve
A beta molecular sieve, high crystallinity technology, applied in the field of beta molecular sieve synthesis, can solve the problems of low molecular sieve crystallinity, slow crystallization speed, large amount of template agent, etc. Effect
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Embodiment 1
[0047] At 25°C, ZSM-5 molecular sieves were added to the aqueous solution of methyl methacrylate and sodium chloride (the mass percent concentration of methyl methacrylate was 0.2%, and the mass percent concentration of sodium chloride was 0.2%), ZSM The weight ratio of -5 molecular sieves (calculated on a dry basis) to the aqueous solution of methyl methacrylate and sodium chloride is 0.5, stirred for 2 hours, filtered, and then dried at 40°C in an air atmosphere. Then drop into the β molecular sieve seed crystal suspension (the β molecular sieve content is 0.5% by weight in the β molecular sieve seed crystal suspension, and the β molecular sieve crystal seed is the β molecular sieve prepared by Comparative Example 1), the β molecular sieve seed crystal suspension and The weight ratio of the ZSM-5 molecular sieve on a dry basis is 10, stirred at a temperature of 40°C for 1 hour, filtered, and dried in an air atmosphere of 90°C to obtain a ZSM-5 molecular sieve (also called mod...
Embodiment 2
[0051] At 25°C, ZSM-5 molecular sieves were added to the salt solution of methyl methacrylate (the content of methyl methacrylate in the solution was 0.2% by weight, and the content of sodium chloride was 0.2% by weight) for 2 hours, filtered and heated at 40 °C dried under air atmosphere. Then drop into the β molecular sieve seed crystal suspension (the content of β molecular sieve in the β molecular sieve seed suspension is 4.6% by weight, wherein the β molecular sieve as the seed crystal is the β molecular sieve prepared by the method of Comparative Example 2), the β molecular sieve seed crystal The weight ratio of the suspension to the ZSM-5 molecular sieve on a dry basis is 20, the temperature is 40°C and the stirring time is 1 hour for treatment, filtered and dried in an air atmosphere at 90°C to obtain ZSM with β-seed crystal adhesion -5 molecular sieves. Dissolve 1.2g of aluminum isopropoxide in 23g of deionized water, add 2.4g of NaOH particles, and then add 50g of s...
Embodiment 3
[0055] At normal temperature, ZSM-5 molecular sieves were added to the salt solution of methyl methacrylate (containing 0.2% by weight of methyl methacrylate and 0.2% by weight of sodium chloride in the salt solution) for 2h, filtered and heated at 40 Dry under air atmosphere at ℃, the weight ratio of the dry base of ZSM-5 molecular sieve to the salt solution of methyl methacrylate is 1:14; It is 7.9% by weight, and it is treated in the β molecular sieve DB3) obtained in Comparative Example 3. The treatment temperature is 40° C., and the treatment time is 1 hour. Filter and dry in an air atmosphere at 90° C. to obtain ZSM-5 with β seed crystal adhesion Molecular sieve. Dissolve 0.6g of aluminum nitrate in 69g of deionized water, add 2.4g of NaOH particles, then add 30g of tetraethylammonium hydroxide and 28g of tetraethylammonium hydroxide solution (tetraethylammonium hydroxide mass fraction 25%), fully After stirring evenly, add the ZSM-5 molecular sieve that β seed crystal ...
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