A kind of γ-alumina and preparation method thereof
A technology of alumina and aluminum salts, applied in the preparation of aluminum hydroxide, chemical instruments and methods, inorganic chemistry, etc., can solve problems such as wide pore size distribution, achieve uniform microscopic supersaturation, high mixing efficiency, and improve mass transfer efficiency Effect
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[0029] The invention provides a preparation method of γ-alumina, comprising the following steps:
[0030] (1) the aluminum salt solution is vertically dispersed into the flowing metaaluminate solution through the microporous membrane, and the precipitation reaction obtains a pseudo-boehmite suspension;
[0031] (2) aging the pseudo-boehmite suspension obtained in the step (1) to obtain a γ-alumina precursor;
[0032] (3) calcining the γ-alumina precursor obtained in the step (2) to obtain γ-alumina.
[0033] In the invention, the aluminum salt solution is vertically dispersed into the flowing metaaluminate solution through the microporous membrane, and the pseudo-boehmite suspension is obtained by precipitation reaction. The present invention does not have a special limitation on the dispersing device, and a device known to those skilled in the art that can disperse the solution on a micron-scale mixing scale can be used. The present invention preferably disperses the alumin...
Embodiment 1
[0046] 1) Prepare a sodium metaaluminate solution with a concentration of 0.6mol / L, and make it flow at a flow rate of 30mL / min.
[0047] 2) Prepare an aluminum sulfate solution with a concentration of 0.3mol / L, and make it flow at a flow rate of 10mL / min, pass through the microporous membrane and disperse into the sodium metaaluminate solution from the vertical direction.
[0048] 3) The membrane dispersion microreactor was placed in a water bath at 80°C, and the two phases reacted in the microreactor to form a pseudo-boehmite gel, and the pH at the end of the reaction was 9.
[0049] 4) Aging in a stirred tank reactor for 2 hours, then filtering, washing, drying, and roasting at 650°C to obtain γ-alumina.
[0050] The γ-alumina prepared in this example has a pore volume of 1.07mL / g and a specific surface area of 284.4m 2 / g, the average pore diameter is 14.0nm; the microscopic appearance is short fiber-like, the fiber length is 26.4nm, and the fiber diameter is 5.3nm.
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Embodiment 2
[0053] 1) Prepare a sodium metaaluminate solution with a concentration of 1mol / L, and make it flow at a flow rate of 18mL / min.
[0054] 2) Prepare an aluminum sulfate solution with a concentration of 0.8mol / L, and make it flow at a flow rate of 5mL / min, pass through the microporous membrane and disperse into the sodium metaaluminate solution from the vertical direction.
[0055] 3) The membrane dispersion microreactor was placed in a water bath at 60°C, and the two phases reacted in the microreactor to form a pseudo-boehmite gel, and the pH at the end of the reaction was 8.5.
[0056] 4) Aged in a stirred tank reactor for 1 hour, then filtered, washed, dried, and calcined at 650°C to obtain γ-alumina.
[0057] The γ-alumina prepared in this example has a pore volume of 0.92mL / g and a specific surface area of 249.6m 2 / g, the average pore diameter is 13.5nm; the microscopic appearance is short fiber-like, the fiber length is 26.1nm, and the fiber diameter is 5.0nm.
[0058]...
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