Preparation method of core-shell molecular sieve MOR/BEA (mordenite/bromoethylamine)
A core-shell molecular sieve and molecular sieve technology, which is applied in the direction of crystalline aluminosilicate zeolite, etc., can solve the problems of high product shell coverage, low core-shell molecular sieve shell coverage, and low synthesis cost.
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Embodiment 1
[0022] Concrete reactant proportioning and experimental method are as follows:
[0023] Ratio of reactants in nuclei seed: 7Na 2 O: 2.5NaF: 1Al 2 o 3 : 30SiO 2 : 360H 2 o
[0024] The reactant ratio of β nanocrystal: 13(TEA) 2 O: 1Al 2 o 3 : 66SiO 2 : 780H 2 o
[0025] Ratio of reactants for secondary growth of core-shell: 13(TEA) 2 O: 1Al 2 o 3 : 71.4SiO2 2 : 2286H 2 o
[0026] 112.5 grams of silica sol (40%wt) and 2.628 grams of NaF were dissolved in 40 grams of deionized water to configure solution A; 4.1 grams of NaAlO 2 and 12.0 grams of NaOH were dissolved in 50 grams of deionized water to prepare solution B. Slowly add solution B dropwise to solution A, stir well, and crystallize the formed reaction mixture at 170°C for 3 days to obtain large-grain nuclei-phase mordenite I, with a measured fluorine content of 614 μg / g, silicon-alumina The ratio is 20.4.
[0027] 30 grams of white carbon black and 110 grams of tetraethylammonium hydroxide solution (mas...
Embodiment 2~6
[0033] Examples 2-6 are based on the synthesis ratio and synthesis conditions in Table 1, and are synthesized according to the method and steps similar to Example 1 to obtain core-shell molecular sieves CFS2-6#, see Table 1 for details.
Embodiment 7
[0035] Concrete reactant proportioning and experimental method are as follows:
[0036] Nucleus phase seed: industrial MOR (fluorine content 2 / Al 2 o 3 =22.6)
[0037] The reactant ratio of β nanocrystal: 13(TEA) 2 O: 1Al 2 o 3 : 66SiO 2 : 780H 2 o
[0038] Ratio of reactants for secondary growth of core-shell: 13(TEA) 2 O: 1Al 2 o 3 : 71.4SiO2 2 : 2286H 2 O Dissolve 3 g of PDDA (35% wt), 4.5 g of ammonia solution (25% wt) in 142.5 g of NaCl deionized water (0.1 mol / L) and stir evenly, 30 g of industrial MOR is added to this surface as a nuclear phase molecular sieve In the modifier solution, stir and keep at room temperature for 1 hour, filter and dry in the air atmosphere at 60°C, add to the beta zeolite nanocrystal suspension for pre-adhesion for 90 minutes, filter and dry in the air atmosphere at 100°C That is, the processed MOR powder is obtained. 4 grams of white carbon black, 0.765 grams of sodium aluminate, 14.137 grams of tetraethylammonium hydroxide so...
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