Preparation method for modified B-Beta zeolite-containing hydrocracking catalyst
A hydrocracking and beta zeolite technology, applied in physical/chemical process catalysts, molecular sieve catalysts, chemical instruments and methods, etc., can solve the problems of limited application scope of catalysts, inability of reactants to be removed in time, and difficult access of macromolecular hydrocarbons, etc. Achieve the effect of reducing the total synthesis time, improving the crystal synthesis and production speed, and reducing the number of miscellaneous crystals
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Embodiment 1
[0046] Tetraethylammonium hydroxide (TEAOH) is used as template, and the raw materials are borax, sodium hydroxide and silica gel.
[0047] The molar ratio of feeding is:
[0048] SiO 2 / B 2 o 3 =30;TEAOH / B 2 o 3 =3.6; Al 2 o 3 / B 2 o 3 =0
[0049] Na 2 O / B 2 o 3 = 2; H 2 O / B 2 o 3 =200.
[0050] The first stage reaction conditions: 120°C, time: 20 hours
[0051] Second stage reaction conditions: 140°C, time: 40 hours
[0052] The third stage reaction condition: 180°C, time: 8 hours.
[0053] The synthetic sample is B-beta sample A.
Embodiment 2
[0055] Tetraethylammonium hydroxide (TEAOH) is used as a template, and the raw materials are boric acid, sodium hydroxide and water glass.
[0056] The molar ratio of feeding is:
[0057] SiO 2 / B 2 o 3 =55;TEAOH / B 2 o 3 =1.8; Al 2 o 3 / B 2 o 3 =0.5
[0058] Na 2 O / B 2 o 3 =12;H 2 O / B 2 o 3 =400.
[0059] The first stage reaction conditions: 140°C, time: 30 hours
[0060] Second stage reaction conditions: 150°C, time: 48 hours
[0061] The reaction condition of the third stage: 180°C, the time: 20 hours.
[0062] The main properties of the products obtained are listed in Table 1.
[0063] get sample B
[0064] Table 1 Main physicochemical properties of B-β products
[0065] sample
Embodiment 3
[0067]The invention synthesizes modified B-beta zeolite C. Take 2000ml of A sample slurry, containing 400g of solid phase (on a dry basis), dilute the solid-liquid volume ratio to 1:10 with clean water, then add ammonium nitrate to make the concentration of ammonium nitrate in the solution 2.0M, stir, and heat up to 90 Stir at ~95°C for 2 hours at a constant temperature, then cool down to 5-60°C for filtration, and perform a second exchange of the wet filter cake under the same conditions as the first. The B-beta zeolite that has been exchanged twice with ammonium salts is washed until the pH reaches 5-6, and then placed in a drying oven and dried at 110-120° C. for 6 hours (dry basis is 88% by weight). The dried B-β zeolite is placed in a muffle furnace and rapidly raised to 250°C, kept at a constant temperature for 2 hours, then rapidly raised to 400°C, kept at a constant temperature for 4 hours, and finally raised to 540°C, kept at a constant temperature for 10 hours. Afte...
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