Preparation method of macroporous-mesoporous alumina
A mesoporous alumina and aluminum salt technology, applied in the direction of alumina/aluminum hydroxide, can solve the problem of inability to realize the controllable adjustment of macropore-mesoporous aperture, and achieve the effect of reducing preparation cost and simple process
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[0017] Example 1
[0018] Weigh 1.7g citric acid and 7.5g Al(NO 3 ) 3 ·9H 2 O was dissolved in 40 mL of anhydrous ethanol solution, stirred at a constant speed for 0.5 h at room temperature, the solution was colorless and transparent, then 2.0 g of P123 was added to the above solution, and stirred for 24 h in a water bath at 60 °C. Move the above mixed solution to a 60°C oven to continue the aging treatment, and gradually remove the ethanol and water in the system to obtain a macroporous-mesoporous alumina precursor, which completely removes ethanol and water. The macroporous-mesoporous alumina precursor It is light yellow and transparent, ground into a white powder, and then placed in a program-controlled muffle furnace for high temperature treatment. The heating rate is 1 °C / min, and the temperature is kept at 400 °C for 4 hours, and then naturally cooled to obtain macroporous-mesoporous alumina materials.
[0019] Transmission microscope shows that the macroporous-mesopo...
Example Embodiment
[0020] Example 2
[0021] Weigh 1.3g lauric acid and 5.0g AlCl 3 ·6H 2 O was dissolved in 40 mL of anhydrous ethanol solution, stirred at a constant speed for 0.5 h at room temperature, the solution was colorless and transparent, then 1.6 g of P123 was added to the above solution, and stirred for 24 h in a water bath at 30 °C. Move the above mixed solution to a 60°C oven to continue the aging treatment, and gradually remove the ethanol and water in the system to obtain a macroporous-mesoporous alumina precursor, which completely removes ethanol and water. The macroporous-mesoporous alumina precursor It is light yellow and transparent, ground into a white powder, and then placed in a program-controlled muffle furnace for high temperature treatment.
[0022] Transmission microscope shows that the macroporous-mesoporous alumina material has a macropore diameter of 50-80 nm and a mesopore diameter of 3-5 nm. N2 gas adsorption and desorption analysis results show that its specif...
Example Embodiment
[0023] Example 3
[0024] Weigh 1.5g citric acid and 7.5g Al(NO 3 ) 3 ·9H 2 O was dissolved in 40 mL of anhydrous ethanol solution, stirred at a constant speed for 0.5 h at room temperature, the solution was colorless and transparent, then 2.4 g of F127 was added to the above solution, and stirred for 24 h in a water bath at 50 °C. Move the above mixed solution to a 60°C oven to continue the aging treatment, and gradually remove the ethanol and water in the system to obtain a macroporous-mesoporous alumina precursor, which completely removes ethanol and water. The macroporous-mesoporous alumina precursor It is light yellow and transparent, ground into a white powder, and then placed in a program-controlled muffle furnace for high temperature treatment.
[0025] Transmission microscope shows that the macroporous-mesoporous alumina material has a macropore diameter of 50-80 nm and a mesopore diameter of 10-30 nm. N 2 The results of gas adsorption and desorption analysis sho...
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