Method for preparing beta zeolite with multilevel pore canals

[0034] Stir 30ml of methyl orthosilicate, 6g of polyethylene glycol and 30ml of 0.01mol / L acetic acid solution evenly, seal it, and stir at 0°C for 50min. The obtained sol was poured into a polytetrafluoroethylene test tube or a glass tube, and aged in a water bath at 30°C for one day to obtain a wet silica gel column. Then soak the silica gel column with 0.01mol / L ammonia water to prepare mesopores. Then soak the column with 0.1mol / L nitric acid solution, distilled water, 30% ethanol / water ethanol solution and Tween 80 for 6 hours, finally dry and roast to obtain the silica gel monolithic column B 1 .

[0036] According to the mass ratio of 1.25 sucrose: 0.14H 2 SO 4 : 5 water to make a solution, put the silica gel monolithic column B1 into it and soak for 30 minutes, then dry at 100°C for 6 hours, 160°C for 6 hours, repeat the process of soaking, drying, and polymerization once, and then carbonize at 900°C for 4 hours to obtain carbon Silicon composite sample C1.

[0038] Raw materials: 0.031 g of sodium aluminate, 0.055 g of sodium hydroxide, 1.85 g of tetraethylammonium hydroxide solution, and 0.65 g of carbon-silicon complex.

[0039] Experimental process: Mix and stir sodium aluminate, sodium hydroxide, and tetraethylammonium hydroxide solution evenly, then pour this solution into a reaction kettle equipped with C1, stir to make it fully wet, seal the reaction kettle and place in Crystallization at 150°C for 48 hours. Cool after crystallization, filter and wash, then put into an oven and dry at 100-110°C for 3-4 hours, and then burn the resultant in a muffle furnace at 600°C for 5 hours to obtain the product multi-stage channel zeolite beta sample , denoted as A1.

[0040] The XRD spectrum of sample A1 is shown in Figure 2. It can be seen from the figure that there are three peaks at 2θ angles of 7.7°, 21.5°, and 22.4°, and these three peaks are characteristic peaks of zeolite beta, indicating that the preparation The crystal form ...