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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

Pending Publication Date: 2022-05-24
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the randomness of the above method is strong, and the uniformity of the pore size of the obtained γ-alumina is poor.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[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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Abstract

The invention provides a combination formula for regulating and controlling the aperture of gamma-aluminum oxide and a method for regulating and controlling the aperture of gamma-aluminum oxide. The combination formula for regulating and controlling the aperture of gamma-alumina comprises: a dispersion phase, the dispersion phase comprises alumina sol and a pore-enlarging agent, and the pore-enlarging agent contains hydroxyl; the oil phase comprises an oil phase main body, and the oil phase main body comprises at least one of straight-chain amine, straight-chain alcohol and straight-chain alkane. The straight-chain amine, the straight-chain alcohol and the straight-chain alkane contain different groups, so that the interaction forces with hydroxyl groups on the pore-enlarging agent are different, the swelling degree of the pore-enlarging agent can be regulated and controlled, and the purpose of regulating the pore diameter of the gamma-aluminum oxide is achieved.

Description

technical field [0001] The invention relates to the technical field of materials, in particular to a combined formula for regulating the pore size of γ-alumina and a method for regulating the pore size of γ-alumina. Background technique [0002] γ-Alumina has the characteristics of large specific surface area, high strength, thermal stability, and adjustable pore structure, which has a wide range of application prospects in the field of catalyst supports. The pore size of γ-alumina not only affects the distribution of active components, but also affects the diffusion of reactants for some liquid-phase reactions. Therefore, the pore size of γ-alumina is a very important parameter. At present, there are many methods to adjust the pore size of γ-alumina, which can be achieved by changing different types of pore expanders, hydrothermal treatment or adjusting the calcination temperature. However, the above method has strong randomness, and the obtained γ-alumina has poor pore s...

Claims

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Application Information

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IPC IPC(8): C01F7/02C01F7/021C01F7/30B01J21/04B01J32/00B01J35/10
CPCC01F7/02C01F7/021C01F7/30B01J21/04C01P2006/12C01P2006/14C01P2006/17B01J35/638B01J35/635B01J35/633B01J35/647B01J35/615Y02P20/52
Inventor 王玉军伊绘霖骆广生
Owner TSINGHUA UNIV
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