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A method for preparing modified alumina
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A technique of alumina modification, applied in chemical instruments and methods, alkali metal oxides/hydroxides, inorganic chemistry, etc., can solve problems such as weak alkalinity, achieve lower alkalinity, cheap and easy-to-obtain raw materials, and easy The effect of industrial production
Active Publication Date: 2020-08-11
CHINA PETROLEUM & CHEM CORP +1
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Problems solved by technology
But in fact, alumina is an acid-base amphoteric compound, and its alkalinity is weaker than that of acid.
Method used
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Embodiment 1
[0042] (1) Mix 10g of alumina with 100mL of deionized water, stir for 30 minutes, and then dry at 150°C for 15 hours;
[0043] (2) Mix the alumina obtained in step (1) with 100mL ethanol, stir for 30 minutes, then dry at 150°C for 15h, and then treat at 260°C for 4h;
[0044] (3) Mix the alumina obtained in step (2) with 7.5 mg of magnesium sulfate and 100 mL of deionized water, stir for 5 h, then directly filter and separate, and then dry at 150 ° C for 15 h;
[0045] (4) Treat the material obtained in step (3) at 500° C. for 6 hours in a nitrogen atmosphere, and finally obtain modified alumina. The obtained sample number is CL1, and the basic properties of the obtained samples are shown in figure 1 , and other properties are shown in Table 1. From figure 1 It can be seen from Table 1 that the alkali content of the modified alumina is 1.0% of the original alumina, and the surface area is 207m 2 / g, indicating that the method of the present invention can effectively reduce...
Embodiment 2
[0047] (1) Mix 10g of alumina with 90mL of deionized water, stir for 30 min, and then dry at 140°C for 15h.
[0048] (2) Mix the alumina obtained in step (1) with 90 mL of ethanol, stir for 30 min, then dry at 140 °C for 15 h, and then treat at 265 °C for 4 h.
[0049] (3) Mix the alumina obtained in step (2) with 5.5g of magnesium sulfate and 90mL of deionized water, stir for 4 hours, then directly filter and separate, and then dry at 150°C for 15 hours.
[0050] (4) Treat the material obtained in step (3) at 500° C. for 5 hours in a nitrogen atmosphere, and finally obtain modified alumina. The obtained sample number is CL2, and the physicochemical properties of the obtained sample are shown in Table 1.
Embodiment 3
[0052] (1) Mix 10g of alumina with 90mL of deionized water, stir for 30 minutes, and then dry at 140°C for 15 hours;
[0053] (2) Mix the alumina obtained in step (1) with 90 mL of ethanol, stir for 30 min, then dry at 140 °C for 15 h, and then treat at 260 °C for 4 h;
[0054] (3) Mix the alumina obtained in step (2) with 2g of magnesium sulfate and 100mL of deionized water, stir for 6h, then directly filter and separate, and then dry at 150°C for 15h;
[0055] (4) Treat the substance obtained in step (3) at 450° C. for 6 hours in a nitrogen atmosphere, and finally obtain modified alumina. The obtained sample number is CL3, and the physicochemical properties of the obtained sample are shown in Table 1.
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Abstract
The invention discloses a method for preparing modified alumina. The crystal structure of modified alumina is gamma-alumina, the surface area of modified alumina is 100-500 m<2> / g, and the pore volumeis 0.1-0.6 cm<3> / g. The preparation method comprises the following steps: mixing alumina with deionized water, and performing stirring and drying; performing mixing with ethanol, performing stirringand drying, and processing the mixture at a certain temperature; performing mixing and stirring with an aid and deionized water, and then performing filtering, separating and drying directly; finally,performing high-temperature treatment to obtain a modified alumina product. Alumina provided with the method has the characteristic of adjustable alkalinity and meets requirements of adsorbents and carriers for different alkaline properties of alumina.
Description
technical field [0001] The invention relates to a preparation method of modified alumina, in particular to a preparation method of alumina whose basic properties can be adjusted. Background technique [0002] Alumina is an important porous material in industry and is widely used as catalyst carrier and adsorbent. In the prior art, technologies for preparing and modifying alumina are mainly aimed at increasing the acidity of alumina, adjusting pore structure, and improving structural stability. The patent CN104588011A alkane dehydrogenation catalyst and its preparation method uses an alcohol modification method to treat alumina. The specific process is as follows: heat and vacuumize the Sn-containing alumina carrier, then add alcohol solvent in a vacuum state, return to normal pressure, and heat and reflux. The patent describes that the alcohol solvent can modify the surface of the Sn-loaded alumina carrier, the alcohol solvent molecules can preferentially occupy the surfac...
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