Method for synthesizing Y/beta composite molecular sieve
A composite molecular sieve and molecular sieve technology, applied in the direction of octahedral crystalline aluminosilicate zeolite, crystalline aluminosilicate zeolite, etc., can solve the problems of using organic templates, increasing operation steps, and health hazards to achieve crystallinity improvement, The effect of improving guiding efficiency and reducing dosage
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Embodiment 1
[0040] Take 40g of β molecular sieve and 1000mL of 1mol / L NaOH solution in a beaker, stir at room temperature for 30min, transfer to a closed reaction kettle, and treat in an oven at 120°C for 4h. The resulting suspension is the structure-directing agent and is ready for use.
[0041] Initial silica-alumina gel molar ratio: 12.4Na 2 O:50.7SiO 2 :A1 2 o 3 :1200H 2 O. Take 22 g of sodium hydroxide and 5.5 g of sodium aluminate in 500 mL of distilled water, and stir vigorously until they are completely dissolved. Add 70 g of white carbon black slowly and stir vigorously for 30 min. Then add 20mL of the structure-directing agent prepared in the previous step, and stir vigorously for 30 min. Then add 30 g of Y-type molecular sieves, stir vigorously for 30 minutes, put it into a closed reaction kettle, and crystallize in an oven at 130°C for 50 hours. The obtained product was washed 4 times with distilled water to neutrality, and dried at 120°C for 4 hours, and the obtained ...
Embodiment 2
[0045] Take 35g of β molecular sieve and 800mL of 0.8 mol / L KOH solution in a beaker, stir at room temperature for 30min, transfer to a closed reaction kettle, and treat in an oven at 120°C for 3h. The resulting suspension is the structure-directing agent and is ready for use.
[0046] Initial molar ratio of silica-alumina gel: 16.9Na 2 O:60SiO 2 :A1 2 o 3 :960H 2 O. Take 31 g of sodium hydroxide and 18 g of aluminum sulfate in 200 mL of distilled water, and stir vigorously until they are completely dissolved. Add 100 mL of water glass (8 mol / L) slowly, and stir vigorously for 30 min. Then add 30mL of the structure-directing agent prepared in the previous step, and stir vigorously for 40 min. Then add 20 g of Y-type molecular sieves, stir vigorously for 30 minutes, put it into a closed reaction kettle, and crystallize in an oven at 140°C for 35 hours. The obtained product was washed 4 times with distilled water until neutral, and dried at 120°C for 4 hours to obtain a ...
Embodiment 3
[0049] Take 40g of β molecular sieve and 1000mL of 1.2 mol / L NaOH solution in a beaker, stir at room temperature for 30min, transfer to a closed reaction kettle, and treat in an oven at 120°C for 4h. The resulting suspension is the structure-directing agent and is ready for use.
[0050] Initial silica-alumina gel molar ratio: 9.8Na 2 O:40SiO 2 :A1 2 o 3 :1200H 2 O. Take 20 g of sodium hydroxide and 4.2 g of sodium aluminate in 400 mL of distilled water, and stir vigorously until they are completely dissolved. Add 200 g of silica sol (30%) slowly and stir vigorously for 30 min. Then add 40mL of the structure-directing agent prepared in the previous step, and stir vigorously for 30 min. Then add 40 g of Y-type molecular sieves, stir vigorously for 30 minutes, put it into a closed reaction kettle, and crystallize in an oven at 125°C for 55 hours. The obtained product was washed 4 times with distilled water until neutral, and dried at 120°C for 4 hours to obtain a Y / β com...
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