Preparation method of aluminum oxide
A technology of alumina and aluminum sulfate, applied in alumina/hydroxide preparation and other directions, can solve the problems of long production process, high preparation cost, complicated operation steps, etc., and achieves short process, improved properties, and simple and easy operation steps. Effect
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Embodiment 1
[0030] (1) Mix 10g of aluminum sulfate, 0.25g of ferric nitrate, and 100mL of distilled water evenly, then place it in a 70°C water bath and stir until the solution becomes viscous; then dry at 120°C for 10 hours.
[0031] (2) The material obtained in the previous step was placed in a closed reactor, and hydrogen was introduced at a flow rate of 400 mL / min; the temperature was raised to 300 °C at a constant temperature of 5 °C / min for 2 h; .
[0032] (3) The material obtained in the previous step was mixed with 5L hydrochloric acid (8%) and treated at 25°C for 2h, then washed with distilled water until neutral, and dried at 120°C for 10h to obtain alumina product. The obtained sample number CL1, see the crystal phase structure figure 1 , see pore size distribution figure 2 , and other properties are shown in Table 1. from figure 1 , figure 2 It can be seen from Table 1 that the obtained sample is γ-alumina and has a good pore structure.
Embodiment 2
[0034] (1) Mix 15g aluminum sulfate, 0.25g ferric nitrate, and 100mL distilled water evenly, then place in a 75°C water bath and stir until the solution becomes viscous; then dry at 120°C for 10 hours.
[0035] (2) The material obtained in the previous step was placed in a closed reactor, and hydrogen was introduced at a flow rate of 500 mL / min; the temperature was heated to 320 °C at 8 °C / min for 2 h; and then heated to 650 °C at 8 °C / min for 4 h. .
[0036] (3) The substance obtained in the previous step was mixed with 5.5L hydrochloric acid (8%) and treated at 25°C for 3h, then washed with distilled water until neutral, and dried at 120°C for 10h to obtain alumina product. The obtained sample number is CL2, and the obtained sample is γ-alumina with good pore structure.
Embodiment 3
[0038] (1) Mix 20g of aluminum sulfate, 0.3g of ferric nitrate, and 150mL of distilled water evenly, then place it in a water bath at 85°C and stir until the solution becomes viscous; then dry at 120°C for 10 hours.
[0039] (2) The material obtained in the previous step was placed in a closed reactor, and hydrogen was introduced at a flow rate of 500 mL / min; the temperature was raised to 320°C at 11°C / min for 2 h; and then the temperature was raised to 550°C at 11°C / min for 4.5 h.
[0040] (3) The material obtained in the previous step was mixed with 4L hydrochloric acid (7%), treated at 25°C for 2h, washed with distilled water until neutral, and dried at 120°C for 10h to obtain alumina product. The obtained sample number is CL3, and the obtained sample is γ-alumina with good pore structure.
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