Preparation method of nano aluminum oxide based on carbon neutralization
A nano-alumina, carbon neutralization technology, applied in chemical instruments and methods, aluminum compounds, inorganic chemistry, etc., can solve the problems of easy separation of nano-alumina, large specific surface area, long operation time, etc. The effect of large surface area and short reaction time
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Embodiment 1
[0028] A preparation method based on carbon-neutralized nano-alumina, comprising the steps:
[0029] (1) 13.2g of lithium metaaluminate and 7.2 of deionized water were added to the supercritical reaction kettle, stirred at a stirring rate of 80r / min for 60min at room temperature, and then passed 4.48L of carbon dioxide gas into the reaction kettle to make the The pressure was 7MPa, and the temperature was raised to 30°C for 60min to obtain a reaction product; during the reaction, nitrogen was introduced to keep the pressure in the kettle at 7MPa;
[0030] (2) The reaction product of step (1) was filtered, and washed with deionized water until the pH of the filtrate was 7.0, then the solid product was dried at 100° C. for 12 hours, and finally calcined at 150° C. for 1 hour to obtain nano-alumina , the measured yield of nano-alumina was 96.5%, and the purity was 99.95%.
Embodiment 2
[0032] A preparation method based on carbon-neutralized nano-alumina, comprising the steps:
[0033] (1) 16.4g of sodium metaaluminate and 11.5g of deionized water were added to the supercritical reaction kettle, stirred at a stirring rate of 120r / min for 30min at room temperature, and then passed 8.96L of carbon dioxide gas into the reaction kettle to make the kettle The internal pressure was 10MPa, and the temperature was raised to 80°C for 15min to obtain a reaction product; during the reaction, nitrogen was introduced to keep the pressure in the kettle at 10MPa;
[0034] (2) The reaction product of step (1) was filtered and washed with deionized water until the pH of the filtrate was 7.0, then the solid product was dried at 100° C. for 24 hours, and finally calcined at 200° C. for 3 hours to obtain nano-alumina , the measured yield of nano-alumina is 99.9%, and the purity is 99.99%.
Embodiment 3
[0036] A preparation method based on carbon-neutralized nano-alumina, comprising the steps:
[0037] (1) 19.6g potassium metaaluminate and 11.5g deionized water were added in the supercritical reaction kettle, stirred for 45min with the stirring rate of 100r / min at room temperature, then passed 6.72L carbon dioxide gas into the reaction kettle, and made the kettle The internal pressure was 8.5MPa, and the temperature was raised to 60°C for 30min to obtain a reaction product; during the reaction, nitrogen was introduced to keep the pressure in the kettle at 8.5MPa;
[0038] (2) The reaction product of step (1) was filtered and washed with deionized water until the pH of the filtrate was 7.0, then the solid product was dried at 100° C. for 24 hours, and finally calcined at 200° C. for 3 hours to obtain nano-alumina , the measured yield of nano-alumina was 99.5%, and the purity was 99.96%.
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