Flake nano-γ-al2o3 and its preparation method
A flaky and nanotechnology, applied in the field of flaky nano-γ-Al2O3 and its preparation, can solve the problems of low reactivity, small specific surface area of alumina, and few applications, and achieve the effect of cheap raw materials and simple and easy preparation process
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Embodiment 1
[0025] Prepare 10ml of 0.2mol / L aluminum nitrate solution and 35ml of 0.2mol / L sodium hydroxide solution, mix the sodium hydroxide solution and the aluminum nitrate solution and stir evenly. The mixture was transferred to a pressure vessel lined with polytetrafluoroethylene, and kept sealed under hydrothermal conditions at 180°C for 3 hours. Then cool to room temperature, add 10% of the original total volume of absolute ethanol, stir evenly, then airtight and raise the temperature to 200°C for 8 hours of reaction. After the reaction, the product was separated and washed several times with distilled water to remove the impurity ions contained in it. After drying, it was baked at 550°C for 7 hours to obtain flaky nano-γ-Al 2 o 3 , with a length of 45-60 nm and a thickness of 8-12 nm. The alumina nanoparticles are characterized by powder X-ray diffraction as γ-Al 2 o 3 , the specific surface area is 139m 2 / g.
Embodiment 2
[0027] Prepare 10ml of 0.2mol / L aluminum nitrate solution and 30ml of 0.2mol / L sodium hydroxide solution, mix the sodium hydroxide solution and the aluminum nitrate solution and stir evenly. The mixture was transferred to a pressure vessel lined with polytetrafluoroethylene, and kept sealed under hydrothermal conditions at 180°C for 4 hours. Then cool to room temperature, add 15% of the original total volume of absolute ethanol, stir evenly, then airtight and raise the temperature to 220°C for 2 hours to react. After the reaction, the product was separated and washed several times with distilled water to remove the impurity ions contained in it. After drying, it was baked at 550°C for 5 hours to obtain flaky nano-γ-Al 2 o 3 , with a length of 60-80 nm and a thickness of 10-13 nm. The result of the powder X-ray diffraction characterization of the alumina nanoparticles is γ-Al 2 o 3 , the specific surface area is 125m 2 / g.
Embodiment 3
[0029] Prepare the 1mol / L aluminum nitrate solution of 11ml and the 1mol / L potassium hydroxide solution of 37ml,
[0030] Transfer the mixture to a pressure vessel lined with polytetrafluoroethylene, and keep it sealed under hydrothermal conditions at 140°C for 5 hours. Then cool to room temperature, add 20% of the original total volume of absolute ethanol, stir evenly, then airtight and raise the temperature to 250°C for 2 hours to react. After the reaction, the product was separated and washed several times with distilled water to remove the impurity ions contained in it. After drying, it was calcined at 650°C for 3 hours to obtain flaky nano-γ-Al 2 o 3 , with a length of 80-100 nm and a thickness of 10-15 nm. The result of the powder X-ray diffraction characterization of the alumina nanoparticles is γ-Al 2 o 3 , the specific surface area is 117m 2 / g.
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