A kind of method for preparing low silicon beta zeolite
A beta zeolite and silicon source technology, applied in the field of molecular sieve catalytic material synthesis, can solve the problems of cumbersome synthesis steps and immature synthesis technology of high-silicon beta zeolite, and achieve high catalytic reaction efficiency, high acid density, and inhibition of impurity crystals. produced effect
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Embodiment 1
[0030] (1) First, put 16g of aluminum nitrate in a high-temperature furnace and bake it at 500°C for 3h.
[0031] (2) Take 0.27g of sodium hydroxide, 0.1g of sodium aluminate, and 30mL of 25% tetraethylammonium hydroxide in 50mL of distilled water, stir until completely dissolved, then add 8g of white carbon black, stir evenly, and then Under the condition of aging 1.5d.
[0032] (3) Mix the special alumina prepared in step (1) with the silica-alumina gel prepared in step (2), add 0.08g Beta zeolite seed crystals, and dry in an oven at 110°C for 12 hours.
[0033](4) Then put the dry glue obtained in step (3) into the upper part of the reactor, add 10 mL of distilled water to the bottom of the reactor, put it into a closed reaction kettle, and crystallize it in an oven at 140°C for 48 hours. The obtained product was washed 4 times with distilled water to neutrality, and dried at 120°C for 12 hours. The obtained sample number was CL1, and the obtained sample was as follows: f...
Embodiment 2
[0035] (1) First, put 10g of aluminum nitrate in a high-temperature furnace and bake it at 600°C for 2h.
[0036] (2) Take 0.27g of potassium hydroxide, 0.3g of aluminum nitrate, and 30mL of 25% tetraethylammonium hydroxide in 50mL of distilled water, stir until completely dissolved, then add 8g of white carbon black, stir evenly, and then Under aging 2d.
[0037] (3) Mix the special alumina prepared in step (1) with the silica-alumina gel prepared in step (2), add 0.1 g of Beta zeolite seed crystals, and dry in an oven at 120° C. for 12 hours.
[0038] (4) Then put the dry glue obtained in step (3) into the upper part of the reactor, add 12 mL of distilled water to the bottom of the reactor, put it into a closed reaction kettle, and crystallize it in an oven at 140°C for 40 hours. The obtained product was washed 4 times with distilled water until neutral, and dried at 120°C for 12 hours. The obtained sample was beta zeolite, coded as CL2.
Embodiment 3
[0040] (1) First, put 12g of aluminum nitrate in a high-temperature furnace and bake it at 700°C for 2h.
[0041] (2) Take 0.3g of sodium hydroxide, 0.35g of aluminum sulfate, and 30mL of 25% tetraethylammonium hydroxide in 50 mL of distilled water, stir until completely dissolved, then add 8.5g of silica gel, stir evenly, and then Under aging 1.5d.
[0042] (3) Mix the special alumina prepared in step (1) with the silica-alumina gel prepared in step (2), then add 0.13 g of Beta zeolite seed crystals, and dry in an oven at 130° C. for 12 hours.
[0043] (4) Then put the dry glue obtained in step (3) into the upper part of the reactor, add 15 mL of distilled water to the bottom of the reactor, put it into a closed reaction kettle, and crystallize it in an oven at 150°C for 50h. The obtained product was washed 4 times with distilled water to neutrality, and dried at 120°C for 12 hours. The obtained sample was beta zeolite, coded as CL3.
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