Synthesis method of nanosized ZSM-5 molecular sieve
A ZSM-5, molecular sieve technology, applied in the direction of crystalline aluminosilicate zeolite, borocarbonane silicone crystalline aluminosilicate zeolite, etc., can solve the problems of difficult collection of products, excessive amount of template agent, etc., and achieve high crystallinity Effect
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Embodiment 1
[0045] Preparation of macroporous carbon materials:
[0046] (a) Mix 150g of calcium carbonate with 5000mL of 0.05mol / L sodium hydroxide solution, stir at 70°C for 2h; then filter, and dry the obtained solid sample at 500°C for 2.5h;
[0047] (b) Add 7000 mL of distilled water and 300 g of sucrose to the calcium carbonate obtained in step (a), stir for 30 min and then ultrasonicate for 5 h.
[0048] (c) The solution prepared in step (b) was placed in a 70°C water bath and stirred to make the water evaporate until the solution became viscous; then dried at 70°C; finally, the sample was placed in a tube furnace and passed through Inject nitrogen gas at a flow rate of 20mL / min; raise the temperature from room temperature to 900°C at 11°C / min, and keep the temperature constant for 5h;
[0049] (d) Mix the substance obtained in step (c) with 5000mL of 50% hydrochloric acid solution evenly, treat at 140°C for 6h, finally wash with water until neutral, and dry at 100°C for 10h,
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Embodiment 2
[0052] (1) Dissolve 0.12 g of sodium hydroxide in 40 mL of distilled water, then add 10 mL of 25% tetrapropylammonium hydroxide, and stir for 30 min. Then add 0.5 g of sodium aluminate and stir for 30 min. Add 7 g of white carbon black slowly and stir for 30 min.
[0053] (2) Mix the synthetic gel obtained in step (1) with 7.5 g of the macroporous carbon prepared in Example 1, and ultrasonically treat it for 30 minutes; then stir it at 60°C until it becomes viscous; Dry until the water evaporates completely.
[0054] (3) Then put the mixture obtained in step (2) into the reactor, and then add 9 mL of water. Then the reactor was sealed, and the reactor was placed in an oven for crystallization at 180° C. for 50 h. Then the solid product was filtered and washed to neutrality, dried at 100°C for 10 hours, and finally calcined at 500°C for 3 hours in an air atmosphere. The obtained sample number was CL1. figure 1 and figure 2 As shown, it is a pure nano ZSM-5 molecular sieve...
Embodiment 3
[0056] (1) Dissolve 0.15 g of sodium hydroxide in 43 mL of distilled water, then add 7 mL of 25% tetrapropylammonium hydroxide, and stir for 30 min. Then add 0.55 g of sodium aluminate and stir for 30 min. Add 7 g of white carbon black slowly and stir for 30 min.
[0057] (2) Mix the synthetic gel obtained in step (1) with 10 g of the macroporous carbon prepared in Example 1, and ultrasonically treat it for 30 minutes; then stir it at 70°C until it becomes viscous; then dry it at 120°C until the water evaporates completely.
[0058] (3) Then put the mixture obtained in step (2) into the reactor, and then add 10 mL of water. Then the reactor was sealed, and the reactor was placed in an oven for crystallization at 200° C. for 35 h. Then filter and wash the solid product to neutrality, dry at 100°C for 10h, and finally roast at 500°C for 3h in the air atmosphere. The obtained sample number is CL2, which is a pure nano ZSM-5 molecular sieve without other impurities. The propert...
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