Synthetic method of Beta molecular sieve with low silica-alumina ratio
A kind of technology of low silicon-aluminum ratio, synthesis method
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Embodiment 1
[0065] Weigh 0.08 g of sodium metaaluminate and 6.48 g of 25% tetraethylammonium hydroxide solution, mix well, add 6.6 g of 40% silica sol solution, and then stir evenly. Transfer the mixed solution into a polytetrafluoroethylene-lined stainless steel reaction kettle, raise the temperature to 160°C and keep it for 1 day, cool to room temperature and take it out, then add 0.05g of sodium metaaluminate and 3.9g of water to it, stir well and put The mixed solution was then transferred into a polytetrafluoroethylene-lined stainless steel reaction kettle, heated to 160°C for 2 days, cooled to room temperature, washed with deionized water for 3 times, dried in an oven at 120°C, and roasted at 550°C for 12 hours , to prepare Beta molecular sieves. Its XRD spectrum is attached Figure 4 ; NH 3 -TPD diagram attached Figure 5 . The Si / Al and acid content characterization results of the obtained Beta molecular sieves are summarized in Table 1.
Embodiment 2
[0067] Weigh 0.08g of sodium metaaluminate and 7g of 25% tetraethylammonium hydroxide solution, mix well, add 6.6g of 40% silica sol solution, and then stir evenly. Transfer the mixed solution into a polytetrafluoroethylene-lined stainless steel reaction kettle, raise the temperature to 170°C and keep it for 1 day. After cooling to room temperature, add 0.12g of sodium metaaluminate and 3.9g of water to it, stir well, and put The mixed solution was then transferred into a polytetrafluoroethylene-lined stainless steel reaction kettle, heated to 170°C for 2 days, cooled to room temperature, washed with deionized water for 3 times, dried in an oven at 120°C, and roasted at 550°C for 12 hours , to prepare Beta molecular sieves. The Si / Al and acid content characterization results of the obtained Beta molecular sieves are summarized in Table 1.
Embodiment 3
[0069] Weigh 0.08 g of sodium metaaluminate and 7.5 g of 25% tetraethylammonium hydroxide solution, mix well, add 6.6 g of 40% silica sol solution, and then stir evenly. Transfer the mixed solution into a polytetrafluoroethylene-lined stainless steel reaction kettle, raise the temperature to 170°C and keep it for 1 day, then cool to room temperature, then add 0.32g of sodium metaaluminate and 3.9g of water to it, stir the mixed solution evenly Move it into a polytetrafluoroethylene-lined stainless steel reaction kettle, raise the temperature to 170°C and keep it for 2 days, then cool it to room temperature, wash it with deionized water for 3 times, dry it in an oven at 120°C, and roast it at 550°C for 12 hours to obtain Beta molecular sieve. The Si / Al and acid content characterization results of the obtained Beta molecular sieves are summarized in Table 1.
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