Combination formula for regulating and controlling aperture of gamma-aluminum oxide and method for regulating and controlling aperture of gamma-aluminum oxide
A technology of alumina and formula, applied in the field of materials, can solve problems such as poor uniformity of γ-alumina
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[0030] According to an embodiment of the present invention, the preparation method of the aluminum sol includes: sequentially hydrolyzing and gelling aluminum sec-butoxide to obtain the aluminum sol. In this way, an aluminum sol with higher performance and higher purity can be effectively obtained.
[0031] According to an embodiment of the present invention, the temperature of the hydrolysis is preferably 70-90° C., and the time of the hydrolysis is preferably 5-30 min. Further, the hydrolysis can be performed under stirring conditions. Hydrolysis is carried out under the above conditions,
[0032] In some embodiments, the gelling agent includes dilute nitric acid, and the mass concentration of the dilute nitric acid is 10-40 wt % (for example, it can be 10 wt %, 13 wt %, 15 wt %, 18 wt %, 20 wt %, 23 wt %, 25 wt % , 28wt%, 30wt%, 33wt%, 35wt%, 38wt%, 40wt%). Wherein, the amount of the dilute nitric acid is not specifically limited, as long as the pH value of the aluminum s...
Embodiment 1
[0036] 100g of water was added to 12g of aluminum sec-butoxide, and hydrolyzed at 70° C. and stirred for 20min until the solid content was 7.5wt%; then 20wt% of nitric acid was added to pH 1.5 to obtain 42g of aluminum sol (solid content of 7.1wt%);
[0037] Methyl cellulose was added to 42 g of aluminum sol to obtain a dispersed phase. In the dispersed phase, the mass fraction of methyl cellulose was 2%;
[0038] Dodecane containing 1wt% surfactant Span 85 was prepared and heated to 90°C as oil phase;
[0039] The dispersed phase was added dropwise to 50 mL of hot oil phase at a rate of 0.01 g / min for dispersion molding, and the obtained molding material was dried at 90°C for 12 hours;
[0040] Then, the dried molding material was heated to 600°C for 6 hours and calcined at 2°C / min to obtain γ-alumina. The specific surface area of the obtained γ-alumina is 255.9m by testing 2 / g, the pore volume is 0.62 mL / g, and the average pore diameter is 8 nm.
Embodiment 2
[0042] The dispersed phase was prepared according to the method of Example 1.
[0043] Prepare dodecanol containing 1wt% surfactant Span 85, and heat it to 90℃ as oil phase;
[0044] The dispersed phase was added dropwise to 50 mL of hot oil phase at a rate of 0.01 g / min for dispersion molding, and the obtained molding material was dried at 90 °C for 12 h;
[0045] Then, the dried molding material was heated to 600°C for 6 hours and calcined at 2°C / min to obtain γ-alumina. The specific surface area of the obtained γ-alumina obtained by testing is 260.3m 2 / g, the pore volume is 0.76mL / g, and the average pore diameter is 10.2nm.
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