Preparation method of pseudoboehmite
A technology of pseudo-boehmite and aluminum nitrate, applied in the direction of alumina/hydroxide, etc., can solve the problems of high cost and large specific surface area, and achieve the effects of simple operation, reduced process flow and low cost
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example 1
[0022] Preparation of ethanol aqueous solution, ethanol: water = 1: 1 (volume ratio), in the 40 g / liter aluminum nitrate solution (prepared with alcohol aqueous solution), dropwise add ammonia water solution with a mass fraction of ammonia water of 2.2% (prepared with alcohol aqueous solution), adjust pH to 8, react at 30°C for 30 min, age at 70°C for 6 h, filter, wash with alcohol aqueous solution 2-6 times, and keep warm at 120°C for 6-24 h. The obtained pseudo-boehmite has a specific surface area of 383.5 m 2 / g, pore volume 0.97 cm 3 / g, pore size 9.4 nm.
example 2
[0024] Preparation of ethanol aqueous solution, ethanol: water = 9: 1 (volume ratio), in the 40 g / liter aluminum nitrate solution (prepared with alcohol aqueous solution), dropwise add ammonia water with a mass fraction of 2.2% ammonia solution (prepared with alcohol aqueous solution), adjust pH to 7, react at 50°C for 10 min, age at 80°C for 8 h, filter, wash with alcohol aqueous solution 2-6 times, and keep warm at 120°C for 6-24 h. The obtained pseudo-boehmite has a specific surface area of 440.8 m 2 / g, pore volume 1.23 cm 3 / g, pore size 9.6 nm.
example 3
[0026] Preparation of n-propanol aqueous solution, n-propanol: water = 4: 1 (volume ratio), in 40 g / liter of aluminum nitrate solution (prepared with alcohol aqueous solution), add dropwise ammonia water with a mass fraction of 2.2% ammonia solution (with alcohol aqueous solution prepared), adjust the pH to 10, react at 20°C for 50 min, age at 30°C for 1 h, filter, wash with alcohol aqueous solution for 2-6 times, and keep warm at 120°C for 6-24 h. The obtained pseudo-boehmite has a specific surface area of 432.2 m 2 / g, pore volume 1.37 cm 3 / g, pore size 11.5 nm.
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