A kind of ordered macroporous silicon-aluminum composite oxide and its preparation method
An aluminum composite and oxide technology, applied in silicon compounds, chemical instruments and methods, chemical/physical processes, etc., can solve the problems of low specific surface area of alumina materials, easy damage to macroporous structure, and difficulty in filling, etc. Increased mass transfer capacity, improved activity and selectivity, increased strength effects
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Embodiment 1-4
[0023] Synthesis of Monodisperse Polymer Microspheres. Take 135 mL of twice distilled water and add it to a three-neck flask, then place the flask in a water bath and heat it to 75°C. Add 0.1011 g NaHCO 3 , start the stirrer, and start feeding N at the same time 2 , stabilized for 10min, so that NaHCO 3 Fully dissolve. Add 0.0496 g of sodium p-styrene sulfonate (NaSS) and stabilize for 10 min, then add 29.4 mL of styrene monomer (St) and stabilize for 30 min. Finally, the initiator potassium persulfate (KPS) is added. The reaction system was kept at a constant temperature of 75° C., and the stirrer rotated at 300 rpm. After reacting for 20 hours, it was observed that there were basically no oil droplets on the wall of the three-necked flask. It can be considered that the conversion of styrene monomer had been completed, and the reaction was terminated. Naturally cooled to room temperature, the reaction mother liquor was left standing for later use. In this example, monod...
Embodiment 5-8
[0028] Polystyrene microsphere colloidal crystal template: by natural deposition and centrifugation.
[0029] Natural deposition: Take 150mL polystyrene microsphere emulsion, ultrasonically disperse it for 10 minutes, place it in a flat-bottomed sedimentation tank, and settle naturally at room temperature for 10-30 days. After the liquid is completely volatilized, a colloidal crystal P1 with a thickness of about 1.5mm is obtained.
[0030]Centrifugal deposition: Use 6 centrifuge tubes to measure polystyrene emulsion respectively. After ultrasonic dispersion, centrifuge for a certain period of time. Use a syringe to draw out the upper clear layer, then seal the centrifuge tube with a plastic film, pierce a few small holes on the film, and store it at room temperature. Under low temperature (about 25°C) for 3-7 days, large colloidal crystals with a size of centimeters were obtained.
[0031] Table 2 Preparation conditions of polymer microsphere colloidal crystal template
[003...
Embodiment 9-12
[0034] Preparation of alumina sol. Dissolve 10 g of aluminum nitrate in 15 mL of deionized water at room temperature. While stirring, apply ultrasound (frequency 50kHZ) to the system, slowly add dilute ammonia water with a mass fraction of 3.5wt% to the aluminum nitrate solution, and stop dropping when aluminum hydroxide gel is formed. Alumina gels were washed / centrifuged 3 times. Calculate the amount of concentrated nitric acid required according to n(H) / n(A1)=0.18, then add the concentrated nitric acid directly into the aluminum hydroxide gel, stir vigorously for 10 minutes, and place it in a water bath at 80°C for ultrasonic aging (frequency 50kHZ) to Colorless or light blue, to obtain alumina sol with a particle size of 15nm. Alumina sols with other particle sizes are listed in Table 3.
[0035] Table 3 Preparation and particle size of alumina sol
[0036]
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