Process for preparing multi-class sequential macroreticular-micropore material
A porous material and microporous technology, which is applied in the field of preparation of macroporous, microporous, and hierarchical ordered porous materials
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Embodiment 1
[0015] Example 1 First, zeolite A nanocrystals were prepared according to the method described in the literature (Thomas Bein et al, Science, 1999, 283, 958). The reaction ingredients are 0.3Na 2 O: 11.25 SiO 2 : 1.8 Al 2 o 3 : 13.4 (TMA) 2 O: 700H 2 O, the system uses 25% silica sol (pH=9) to replace 30% silica sol in the original literature, and the reported 97% tetramethylammonium hydroxide is replaced by 25% tetramethylammonium hydroxide aqueous solution. Specific process: adjust 25% silica sol (pH 9) to pH=10 with sodium hydroxide solution, accurately weigh 27g of the silica sol, add 15g of water, and stir to prepare precursor solution I. Simultaneously weigh 7.5g of aluminum isopropoxide, 100g of 25% tetramethylammonium hydroxide, 6g of 1M sodium hydroxide solution, and 25g of water, and stir to prepare precursor solution II. Finally, mix the two precursor solutions under vigorous stirring, stir and react at room temperature for one week, add flocculant-glucose 7.2...
Embodiment 2
[0019] Example 2 Zeolite X nanocrystals were prepared from silica sol, sodium aluminate, sodium hydroxide and water. The reaction process is as follows: 104g silica sol (25%SiO 2 ) (pH is 9), after cooling to 5° C., add 55 g of sodium hydroxide solution (50%), accurately weigh 27 g of the silica sol, add 78 g of water, and stir to make precursor solution I. Mix 61g of water, 30g of 50% sodium hydroxide solution and 20.36g of sodium aluminate (Al 2 o 3 43%), stirred to make precursor solution II. After adding 75g of crushed ice to each flooding solution, the two flooding solutions were mixed rapidly under vigorous stirring, and left for five minutes to form a gel. 22.5g of sucrose was added to the gel, and aged for 16 hours with stirring at room temperature. Dynamic hydrothermal reaction at 100°C for 2-4 hours, after repeated washing with water, a white final product was obtained, which was verified to be zeolite X nanocrystals by XRD, and SEM showed that the zeolite X crys...
Embodiment 3
[0023] Example 3 Zeolite Y nanocrystals were prepared from silica sol, sodium aluminate, sodium hydroxide, 25% tetramethylammonium hydroxide and water. Reaction molar composition: 2.46 (TMA) 2 O: 0.04 Na 2 O: 1Al 2 o 3 : 3.4SiO2 2 :37OH 2O. The reaction process is as follows: first prepare the sodium aluminate sol containing TMA, mix 895g TMA, 5500g water, 6.4g 50% sodium hydroxide solution and 244g sodium aluminate (Al 2 o 3 43%), stirred to make clear precursor solution I. The body-dispelling solution was added to 816g of silica sol (25%), stirred vigorously to obtain a homogeneous solution, and 228.9 grams of glucose was added. Static hydrothermal reaction at 100°C for 2-4 hours, and repeated washing with water to obtain a white final product, which was verified as zeolite Y nanocrystals by XRD, and SEM showed that the zeolite Y crystal grain size was below 80 nanometers.
[0024] Secondly, ethanol is used to disperse the zeolite nanocrystals well, so that it beco...
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