A kind of preparation method of Y-type molecular sieve with high cracking activity
A technology of cracking activity and molecular sieve, which is applied in the direction of molecular sieve catalysts, chemical instruments and methods, hydrocarbon oil cracking, etc., can solve the problem of not meeting the requirements of high stability and high number of acid centers at the same time, affecting cracking activity or selectivity, B acid Center loss and other issues to achieve the effect of optimized product distribution, moderate product distribution, and high skeleton silicon-aluminum ratio
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Embodiment 1
[0017] With 20g (dry basis) industrial NaY molecular sieve (Na 2 O 12.9%, crystallinity 89%, skeleton silicon-aluminum atomic ratio 2.67, Sinopec Changling Catalyst Factory) mixed with 160g water, added 40g glycerol and treated at 180°C for 4 hours to partially depolymerize the molecular sieve; After the polymerization treatment, the slurry was cooled to room temperature, 32g TPAOH solution (mass fraction 25wt%) was added under stirring, the temperature was raised to 40°C again and 6.4mL water glass solution (SiO 2 content 250g / L, modulus 3.3) into it, continue stirring for a certain period of time and then add 42mL sodium metaaluminate (Al 2 o 3 content of 190g / L), and then heated to 60°C for aging for 2h. Transfer the aged slurry to a crystallization kettle for crystallization at 120°C for 15 hours. After the product is filtered, washed and dried, it is calcined at 550°C for 2 hours to obtain the molecular sieve of the present invention, which is designated as GYC-1. The ...
Embodiment 2
[0019] Mix 20g (dry basis) industrial NaY molecular sieve (same as above) with 200g water, add 130g glycerol and treat at 120°C for 8h; cool the depolymerized slurry to room temperature, add 20g TPAOH solution under stirring, and Add 17mL of water glass solution into it, continue to stir for a certain period of time, and then add 150mL of aluminum sulfate (Al 2 o 3 content 90g / L), the temperature was raised to 70°C and aged for 2h. Transfer the aged slurry to a crystallization kettle for crystallization at 100°C for 20 hours. After filtration, washing and drying, the product is calcined at 650°C for 4 hours to obtain the molecular sieve of the present invention, which is designated as GYC-2. The XRD spectrum shows that it has the structural characteristics of a typical Y-type molecular sieve.
Embodiment 3
[0021] Mix 20g (dry basis) industrial NaY molecular sieve (same as above) with 100g water, add 190g propylene glycol and process at 140°C for 4h; cool the depolymerized slurry to room temperature, add 56g TMAOH solution (mass fraction 25wt% ), heated up to 60°C again and added 25g of tetraethoxy silicon into it, continued to stir for a period of time, then added 84mL of sodium metaaluminate, and continued to age at 60°C for 2h. Transfer the aged slurry to a crystallization kettle for crystallization at 110°C for 10 hours. After the product is filtered, washed and dried, it is calcined at 600°C for 6 hours to obtain the molecular sieve of the present invention, which is designated as GYC-3. The XRD spectrum shows that it has the structural characteristics of a typical Y-type molecular sieve.
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