Synthetic method for small-crystal-size high-silicon Y-type molecular sieve
A synthesis method and small crystal grain technology, applied in the direction of crystalline aluminosilicate zeolite, octahedral crystalline aluminosilicate zeolite, etc., can solve the problems of low external area, easy coking, unfavorable material diffusion, etc., and achieve industrial production. The effect of low synthesis cost and high catalytic activity
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[0039] Example 1
[0040] (1) First, mix 40 mL of distilled water with 6 g of sodium hydroxide, add 1.5 g of sodium aluminate after dissolution, add 8 g of white carbon black after the dissolution is complete, and then place it in a 40°C water bath and stir for 72 hours.
[0041] (2) Slowly add 10 mL of 3.75 mol / L hydrochloric acid to the mixture obtained in step (1). During the addition, prevent the mixture from undergoing morphological changes due to the drastic changes in the local pH value.
[0042] (3) Mix and add 6g of white carbon black to the mixture obtained in step (2), then stir at room temperature for 1 hour, then load the reaction mixture into the reactor, seal the reactor, and place the reactor in an oven at 100°C After crystallization for 50 hours, the solid product was dried at 120°C for 12 hours. The sample number was CL1, which was a pure Y-type molecular sieve with a silicon-to-aluminum ratio of 5.9 and a particle size of 210 nm.
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[0043] Example 2
[0044] (1) First, mix 40 mL of distilled water with 6 g of sodium hydroxide, add 9 g of aluminum nitrate after dissolution, add 8 g of white carbon black after the dissolution is complete, and then place it in a 35°C water bath and stir for 72 hours.
[0045] (2) Slowly add 9 mL of 3.75 mol / L hydrochloric acid dropwise to the mixture obtained in step (1). During the dropwise addition, the mixture should be prevented from morphological change due to sharp changes in the local pH value.
[0046] (3) Mix and add 6g of white carbon black to the mixture obtained in step (2), then stir at room temperature for 1 hour, then load the reaction mixture into the reactor, seal the reactor, and place the reactor in an oven at 100°C After crystallization for 55 hours, the solid product was dried at 120°C for 12 hours. The sample number was CL2, which was a small-crystal high-silicon Y-type molecular sieve.
Example Embodiment
[0047] Example 3
[0048] (1) First, mix 45mL of distilled water with 5.5g of sodium hydroxide, add 7g of aluminum nitrate after dissolution, add 8g of white carbon black after the dissolution is complete, and then place it in a 45°C water bath and stir for 60h.
[0049] (2) Slowly add 10 mL of 3.75 mol / L hydrochloric acid to the mixture obtained in step (1). During the addition, prevent the mixture from undergoing morphological changes due to the drastic changes in the local pH value.
[0050] (3) Mix and add 5g of white carbon black to the mixture obtained in step (2), then stir for 1.5h at room temperature, and then load the reaction mixture into the reactor, seal the reactor, and place the reactor in an oven at 110 It was crystallized at ℃ for 39 h, and finally the solid product was dried at 120 ℃ for 12 h. The obtained sample was numbered CL3, which was a small-crystalline high-silicon Y-type molecular sieve.
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