A kind of preparation method of titanium oxide airgel with high specific surface area and high controllability
A titanium oxide gel, high specific surface area technology, applied in titanium dioxide, chemical instruments and methods, titanium oxide/hydroxide, etc., can solve the problem of high specific surface area titanium oxide aerogel, difficult to obtain formability, reduce condensation The problem of glue crosslinking degree and skeleton strength, etc., to achieve the effect of good controllability and uniform structure
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Embodiment 1
[0023] Example 1 : Add tetrabutyl titanate to ethanol, stir at room temperature for 1 minute, then add hydrochloric acid to it; mix the obtained product with a solution of deionized water, acetone and aniline, continue to stir for 5 minutes and let it stand, the sol will gel within 1 hour ; Wherein: the molar ratio of tetrabutyl titanate, ethanol, hydrochloric acid, deionized water, acetone, aniline is 1:15:0.04:1.2:3.5:2.8. The obtained titania gel was covered with alcohol, aged for 1 day, and then replaced with alcohol six times for 12 hours each time to obtain a titania wet gel.
[0024] Put the titanium oxide wet gel into the supercritical drying equipment, pre-fill with 0.5MPa nitrogen, then raise the temperature of the autoclave to 255°C at a rate of 1°C / min, and the pressure to 7MPa at the same time; then immediately increase the temperature at 20KPa / min The alcohol is discharged at a high rate; finally, the autoclave is naturally lowered to room temperature, and the ...
Embodiment 2
[0026] Example 2 : Titanium isopropoxide is added in isopropanol, stirred at room temperature for 10 minutes, then nitric acid is added thereto; the resulting product is mixed with a solution of deionized water, acetone and aniline, and left to stand after continuing to stir for 20 minutes. The desired titanium oxide gel can be obtained; wherein: the molar ratio of titanium isopropoxide, isopropanol, nitric acid, deionized water, acetone, and aniline is 1:30:0.08:2:2:8. The obtained titanium oxide gel was covered with alcohol, aged for 5 days, and then replaced twice with alcohol for 24 hours each time to obtain a titanium oxide wet gel.
[0027] Put the titanium oxide wet gel into the supercritical drying equipment, pre-fill with 6MPa nitrogen, and then raise the temperature of the autoclave to 255°C at a rate of 3°C / min, while the pressure rises to 10MPa; The alcohol is discharged at a high speed; finally, the autoclave is naturally lowered to room temperature, and the sam...
Embodiment 3
[0029] Example 3 : Add tetrabutyl titanate to methanol, stir at room temperature for 5 minutes, and then add nitric acid; mix the obtained product with a solution of water, acetone and aniline, continue to stir for 10 minutes and then let it stand, the desired oxidation can be obtained in a few hours Titanium gel; wherein: the molar ratio of tetrabutyl titanate, methanol, nitric acid, water, acetone, and aniline is 1:45:0.3:2:4:2. The obtained titania gel was covered with alcohol, aged for 4 days, and then replaced with alcohol for 4 times, each time for 12 hours, to obtain a titania wet gel.
[0030] Put the titanium oxide wet gel into the supercritical drying equipment, pre-fill with 2MPa nitrogen, then raise the temperature of the autoclave to 255°C at a rate of 1°C / min, and the pressure to 7MPa at the same time; / min to discharge the alcohol; finally, the autoclave was naturally lowered to room temperature, and the sample was taken out to obtain titanium oxide airgel.
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