Method for preparing spherical aluminum oxide
A spherical alumina and aluminum source technology, applied in chemical instruments and methods, catalyst carriers, chemical/physical processes, etc., can solve the problems of dispersed pore distribution, poor three-dimensional connectivity and randomness of large pores, and achieve three-dimensional maintenance The effect of the through macroporous structure
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Embodiment 1
[0026] After fully dissolving 10 grams of aluminum chloride, 29.4 grams of water, and 0.063 grams of polyethylene glycol (viscosity-average molecular weight of 1 million) and mixing uniformly, 2.73 grams of ethylene oxide was added to the above mixture and mixed uniformly to control the System temperature is 5°C;
[0027] Take 50 ml of the above mixture and add it to 100 ml of vacuum pump oil under continuous stirring to form a W / O emulsion, then heat the emulsion system to 70°C to gel the water phase into balls;
[0028] After the gel balls were separated from the oil phase, they were aged in 3wt% ammonia water at 100°C for 10 hours, dried at 60°C for 24 hours, and then fired at 500°C for 12 hours to obtain spherical alumina. After measurement, the specific surface area of the obtained spherical alumina is 271m 2 / g, pore volume 0.65mL / g, particle size 1.5mm. Morphological observation by scanning electron microscope (see figure 1 ), the diameter of the macropore is 5 μm,...
Embodiment 2
[0030] 10 grams of aluminum chloride, 3.8 grams of water, 3.8 grams of ethanol, 0.063 grams of polyethylene glycol (viscosity average molecular weight 100,000) are fully dissolved and mixed uniformly, then 3.64 grams of ethylene oxide are added to the above mixture and mixed with Mix evenly, and control the temperature of the system to 10°C;
[0031] Take 50 ml of the above mixture, add it to 500 ml of No. 6 solvent oil under high-speed stirring to form a W / O emulsion, and then heat the emulsion system to 90°C to gel the water phase into balls;
[0032] After separating the gel balls from the oil phase, age them in ammonia water with a concentration of 7wt% at 100°C for 10 hours, dry them at 80°C for 8 hours, separate and dry them, and then bake them at 550°C for 10 hours to obtain a spherical shape. alumina. After measurement, the specific surface area of the obtained spherical alumina is 287m 2 / g, pore volume 0.82mL / g, particle size 2mm. According to the observation of...
Embodiment 3
[0034] After fully dissolving and mixing 10 grams of aluminum nitrate, 13.2 grams of ethanol, and 0.27 grams of polyethylene glycol (viscosity average molecular weight 1.5 million), 3.52 grams of ethylene oxide was added to the above mixture and mixed with it, and the control The temperature of the system was 10°C.
[0035] Take 50 ml of the above mixture and add it to 300 ml of transformer oil under high-speed stirring to form a W / O emulsion, then heat the emulsion system to 90°C to gel the water phase into balls;
[0036] After the gel balls were separated from the oil phase, they were aged in 7wt% ammonia water at 100°C for 10 hours, dried at 100°C for 8 hours, and then fired at 600°C for 10 hours to obtain spherical macroporous alumina. After measurement, the specific surface area of the obtained spherical alumina is 236m 2 / g, pore volume 0.89mL / g, particle size 1mm. According to the observation of the scanning electron microscope morphology, the diameter of the macro...
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