A kind of molecular sieve sapo‑34 with low silicon content and preparation method thereof
A SAPO-34, silicon content technology, applied in the direction of molecular sieve and alkali exchange phosphate, molecular sieve characteristic silicoaluminophosphate, etc., can solve the problems of difficult to obtain pure phase SAPO-34 molecular sieve, unfavorable scale-up production, etc., to achieve the reduction of impurities, Inexpensive, high catalytic performance effect
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Embodiment 1
[0026] A preparation method of molecular sieve SAPO-34 with low silicon content comprises the following steps:
[0027] (1) Gelling: Dissolve 264g of phosphorous acid in 500ml of water, add 200ml of phosphoric acid dropwise while stirring, mix this mixed acid solution with 16.9ml of silica sol, and then mix it with a solution of 212.3g of pseudo-boehmite and 500ml of water And stir quickly, add 202.4g triethylamine while stirring, stir for 1 hour, then add 500ml water, mix well to obtain synthetic colloid, gel forming temperature is 25°C.
[0028] (2) Hydrothermal crystallization: The synthetic colloid obtained in step (1) was ultrasonicated at 20 kHz for 1 hour, then transferred into a stainless steel reactor, and hydrothermally crystallized at 190° C. and autogenous pressure for 30 hours.
[0029] (3) Post-treatment: the product after hydrothermal crystallization in step (2) was collected, washed, and dried at 60° C. to obtain the silicoaluminophosphate molecular sieve SAPO-...
Embodiment 2
[0033] A preparation method of molecular sieve SAPO-34 with low silicon content comprises the following steps:
[0034] (1) Gel formation: Dissolve 82 g of phosphorous acid in 500 ml of water, and add 133.3 ml of phosphoric acid dropwise during stirring to obtain a mixed acid solution. Mix the mixed solution of 4g of white carbon black and 100ml of water with the mixed acid solution to obtain the mixture A. Mix 200g of pseudo-boehmite powder with 200ml of water to obtain mixture B. Then, add mixture A to mixture B and stir rapidly. After 40 minutes, add 202.4 g of triethylamine and 500 ml of water while stirring, and stir for 1 hour to obtain a synthetic colloid. The gel forming temperature is 30°C.
[0035] (2) Hydrothermal crystallization: The synthetic colloid obtained in step (1) was ultrasonicated at 30 kHz for 2 hours, then moved into a stainless steel reactor, and hydrothermally crystallized at 192° C. and autogenous pressure for 24 hours.
[0036] (3) Post-treatment:...
Embodiment 3
[0038] A preparation method of molecular sieve SAPO-34 with low silicon content comprises the following steps:
[0039] (1) Gelling: dissolve 61.5g of phosphorous acid in 600ml of water, then add 150ml of phosphoric acid dropwise, add this mixed acid aqueous solution to 364.3g of aluminum isopropoxide solid powder and stir rapidly for 120min, while stirring, add 303.6g of triethylamine , add 1000ml of water, and finally add 4.7g of white carbon black, stir until uniform, then continue to stir for 2h, and obtain a synthetic colloid at 35°C.
[0040](2) Hydrothermal crystallization: The synthetic colloid obtained in step (1) was ultrasonicated at 25 kHz for 3 hours, then moved into a stainless steel reactor, and hydrothermally crystallized at 196° C. and autogenous pressure for 36 hours.
[0041] (3) Post-treatment: the hydrothermal crystallized product in step (2) was collected, washed, and dried at 75° C. to obtain the silicoaluminophosphate molecular sieve SAPO-34.
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