Synthetic method for regulating wall thickness of SBA-15
A synthesis method, P123 technology, applied in chemical instruments and methods, molecular sieve compounds, molecular sieves and alkali exchange compounds, etc., can solve problems such as poor zeolite molecular sieves, and achieve the effect of improving hydrothermal stability
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Embodiment 1
[0018] Add 0.2 g of polyethylene glycol (PEG2000) to 32 ml of aqueous solution in which 2 g of template agent P123 (molecular weight is 5800) has been dissolved, and after adding 60 mL of hydrochloric acid with a concentration of 2 mol / L, transfer it to a three-necked flask at 40°C and stir in a water bath for 2 hour, add 5.1g tetraethyl orthosilicate, continue stirring in a water bath at 40°C for 24 hours, then transfer the resulting mixed solution to a hydrothermal tank with a polytetrafluoroethylene liner, and crystallize at 100°C for 24 hours, the obtained The precipitate was repeatedly washed with deionized water until it was free of chloride ions, then dried in an electric blast drying oven, and then calcined in a muffle furnace at 550°C for 6 hours. The obtained white powder was thick-walled SBA-15 adjusted with PEG2000. Compared with the 2.18nm wall thickness of the SBA-15 molecular sieve without adding PEG, the wall thickness of the SBA-15 molecular sieve obtained in t...
Embodiment 2
[0020] Add 0.2 g of polyethylene glycol (PEG10000) to 32 ml of aqueous solution in which 2 g of P123 (molecular weight is 5800) is dissolved, add 60 mL of hydrochloric acid with a concentration of 2 mol / L, transfer it to a three-necked flask and stir in a water bath at 40 ° C for 2 hours, Add 5.1g tetraethyl orthosilicate, continue stirring in a water bath at 40°C for 24 hours, then transfer the resulting mixture to a hydrothermal tank with a polytetrafluoroethylene liner, and crystallize at 100°C for 24 hours, and the resulting precipitate is passed through After repeated washing with deionized water until there is no chloride ion, put it into an electric blast drying oven for drying, and then calcinate in a muffle furnace at 550°C for 6 hours, and the obtained white powder is the thick-walled SBA-15 adjusted with PEG10000. Compared with the 2.17nm wall thickness of the SBA-15 molecular sieve without adding PEG, the wall thickness of the SBA-15 molecular sieve obtained in this...
Embodiment 3
[0022] Add 0.2g of polyethylene glycol (PEG6000) to 32ml of aqueous solution in which 2g of P123 was dissolved, add 60mL of hydrochloric acid with a concentration of 2mol / L, transfer it to a three-necked flask, stir in a water bath at 40°C for 2 hours, and add 5.1g of orthosilicon Acetate ethyl ester, continue to stir in a water bath at 40°C for 24 hours, then transfer the resulting mixture to a hydrothermal tank with a polytetrafluoroethylene liner, crystallize at 100°C for 24 hours, and wash the resulting precipitate repeatedly with deionized water Put it into an electric blast drying oven to dry it until there is no chloride ion, and then calcinate it in a muffle furnace at 550°C for 6 hours, and the obtained white powder is the thick-walled SBA-15 adjusted with PEG6000. Compared with the 2.17nm wall thickness of the SBA-15 molecular sieve without adding PEG, the wall thickness of the SBA-15 molecular sieve obtained in this example is 4.15nm.
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