A kind of t-l composite molecular sieve and preparation method thereof
A composite molecular sieve and molecular sieve technology, applied in molecular sieve catalysts, chemical instruments and methods, physical/chemical process catalysts, etc., can solve the problems of complex process, short active life, and long synthesis time, so as to improve preparation efficiency and selectivity , The preparation process is simple and easy to repeat
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Embodiment 1
[0037] Weigh 0.54gKOH, 0.9gNaOH, 0.25g NaAlO 2 Add 6.2mL of deionized water in sequence to fully dissolve, then add 0.43g of hexamethylbisammonium bromide template agent and stir, and slowly add 7.7mL of 5.465mol / L silica sol dropwise after the solid is completely dissolved, and continue to stir at room temperature for 1 hour to form a uniform and stable The sol was transferred to a reaction kettle with a polytetrafluoroethylene liner; the temperature was raised to 100°C, and crystallized for 2 days; the crystallized product was taken out, washed with water to pH 8, filtered with suction, dried in an oven at 120°C for 5 hours, and Roasting at 550° C. for 5 hours to obtain a crystal form composite molecular sieve of T-L molecular sieve.
[0038] In order to further confirm that the prepared T-L composite molecular sieve has the characteristics of both T and L molecular sieves, the T+L mechanically mixed molecular sieve obtained by mechanically mixing the T molecular sieve and t...
Embodiment 2
[0046] Weigh 0.72gKOH, 0.77gNaOH, 0.66g aluminum sulfate octadecahydrate, add 6.2mL deionized water in turn to fully dissolve, then add 0.87g hexamethyldiammonium bromide template agent and stir, after the solid is completely dissolved, slowly add 7.7mL5.465mol / L of silica sol, continue to stir at room temperature for 1 hour to form a uniform and stable sol; place the sol in a reaction kettle lined with polytetrafluoroethylene, raise the temperature of the sol to 120°C, and hydrothermally crystallize for 42 hours; take out the crystallized product , washed with water to pH 9, suction filtered, dried in an oven at 100°C for 5 hours, and calcined at 650°C for 3 hours to obtain a T-L composite molecular sieve.
[0047] Figure 7 Be the N of the T-L composite molecular sieve in embodiment 2 2 Adsorption-desorption curve and pore size distribution diagram, it can be seen from the figure that the T-L composite molecular sieve obtained in Example 2 contains mesopores; the pore diam...
Embodiment 3
[0049] Weigh 0.56gKOH, 0.93gNaOH, 0.37g NaAlO 2 Add 12.2mL of deionized water in order to fully dissolve, then add 0.43g of hexamethylbisammonium bromide template agent and stir, and slowly add 9.6mL of 4.36mol / L water glass dropwise after the solid is completely dissolved, and continue to stir at room temperature for 1 hour to form a uniform and stable sol; placed in a reaction kettle lined with polytetrafluoroethylene, the sol was heated up to 180 ° C, and hydrothermally crystallized for 1 d; the crystallized product was taken out, washed with water to pH 9, suction filtered, and dried in an oven at 110 ° C 5h, calcined at 350°C for 7h to prepare T-L composite molecular sieve.
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