Method for preparing ZSM-5 zeolite molecular sieve microspheres

[0021] Example 1

[0022] Take 1.5 ml of polymethylsiloxane and disperse it in 15 ml of absolute ethanol and stir evenly to obtain solution I for later use; weigh 0.02 g of NaAlO 2 Dissolve 0.06g NaOH in 35ml distilled water, then add 19ml tetrapropylammonium hydroxide 25% aqueous solution, stir well, add 6ml ethyl orthosilicate dropwise, stir at room temperature for 3h to obtain a transparent solution, then add 12ml solution I, After stirring at room temperature for 5 hours, a semi-transparent solution was obtained. The product was transferred to a closed reaction kettle. After crystallization at 90°C for 4 days, the reaction kettle was taken out and cooled naturally. The product in the kettle was separated, washed with ethanol for 3 times, and washed with water twice at 40°C. Vacuum drying for 36 hours, calcination in a muffle furnace at 400°C for 5 hours to obtain ZSM-5 zeolite molecular sieve microspheres.

[0023] Example 2

[0024] Disperse 2.5 ml of polymethylsiloxane in 24 ml of n-propanol and stir evenly to obtain solution I for later use; weigh out 0.08 g of NaAlO 2 Dissolve 0.12g of NaOH in 75ml of distilled water, then add 17ml of n-butylamine, add 10ml of ethyl orthosilicate dropwise after stirring, stir at room temperature for 6 hours to obtain a transparent solution, then add 20ml of solution I, and stir at room temperature for 12 hours to obtain half Transparent solution, transfer the product into a closed reaction kettle, after crystallization at 180°C for 5 days, take out the reaction kettle to cool naturally, separate the product in the kettle, first wash with ethanol 3 times, wash 2 times with water, and dry at 50°C for 24h in vacuum. The ZSM-5 zeolite molecular sieve microspheres were calcined in a muffle furnace at ℃ for 5h.

[0025] Example 3

[0026] Disperse 4.5 ml of methyltriethoxysilane in 35 ml of ethanol and stir to obtain solution I for later use; weigh 0.10 g of NaAlO 2 Dissolve 0.28g NaOH in 155ml distilled water, then add 40ml tetrapropylammonium hydroxide 25% aqueous solution, stir well and add 14ml ethyl orthosilicate dropwise, stir at room temperature for 9h to obtain a transparent solution, then add 16ml solution I, After stirring at room temperature for 24 hours, a semi-transparent solution was obtained. The product was transferred to a closed reaction vessel. After crystallization at 150°C for 7 days, the reaction vessel was taken out and cooled naturally. The product in the kettle was separated, washed with ethanol 3 times and then washed twice with water, and vacuum at 60°C. Drying for 12 hours, calcining in a muffle furnace at 550°C for 7 hours to obtain ZSM-5 zeolite molecular sieve microspheres.