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Method for preparing nanometer magnesium aluminum spinel

A magnesia-aluminum spinel and aluminum spinel technology, which is applied in the field of preparing nano-magnesium-aluminum spinel, can solve the problems of decreased specific surface area, imperfect crystallization of magnesia-aluminum spinel particles, poor stability and the like, and achieves perfect crystallization , easy to mass production, solve the effect of agglomeration and sintering

Active Publication Date: 2018-07-10
SOUTHEAST UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When the calcination temperature is low, the crystallization of magnesium aluminum spinel particles is not perfect and the stability is poor, but when the calcination temperature is too high, the specific surface area will decrease due to the agglomeration and sintering of the particles

Method used

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  • Method for preparing nanometer magnesium aluminum spinel
  • Method for preparing nanometer magnesium aluminum spinel

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] Example 1: Prepare 2 L of potassium sulfate solution with a concentration of 0.1 mol / L with deionized water, add polyacrylic acid with a salt mass of 5%, and dissolve it. Under the condition of stirring, drop the potassium sulfate solution containing polyacrylic acid into 50 liters of ethanol, wash the precipitate with ethanol for 1-2 times, and obtain nanometer potassium sulfate after drying. Weigh 20 grams of nano-potassium sulfate, disperse it in 200 ml of ethanol, add 0.5 grams of stearic acid, and keep stirring at 50° C. for 2 hours. After centrifuging the nano-potassium sulfate ethanol dispersion, disperse the nano-potassium sulfate in 200ml xylene, add 10g magnesium aluminum carbonate precursor, stir at 80°C for 2 hours, centrifuge, dry, calcinate at 1000°C for 2 hours, wash with water and drying to obtain nano-magnesium-aluminum spinel.

Embodiment 2

[0039] Example 2: Prepare 2 L of potassium sulfate solution with a concentration of 0.1 mol / L with deionized water, add polyacrylic acid with a salt mass of 5%, and dissolve it. Under the condition of stirring, drop the potassium sulfate solution containing polyacrylic acid into 50 liters of ethanol, wash the precipitate with ethanol for 1-2 times, and obtain nanometer potassium sulfate after drying. Weigh 0.2 g of nano-potassium sulfate, disperse it in 200 ml of ethanol, add 0.02 g of stearic acid, and keep stirring at 50° C. for 2 hours. After centrifuging the nano potassium sulfate ethanol dispersion, disperse the nano potassium sulfate in 200ml xylene, add 0.1g magnesium aluminum carbonate precursor, stir at 80°C for 2 hours, centrifuge, dry, and calcinate at 1000°C for 2 hours, After washing with water and drying, the nano-magnesium-aluminum spinel is obtained.

Embodiment 3

[0040]Example 3: Prepare 2 L of potassium sulfate solution with a concentration of 0.1 mol / L with deionized water, add polyacrylic acid with a salt mass of 5%, and dissolve it. Under the condition of stirring, drop the potassium sulfate solution containing polyacrylic acid into 50 liters of ethanol, wash the precipitate with ethanol for 1-2 times, and obtain nanometer potassium sulfate after drying. Weigh 10 grams of nano-potassium sulfate, disperse it in 200 ml of ethanol, add 0.5 grams of stearic acid, and keep stirring at 50° C. for 2 hours. After centrifuging the nano-potassium sulfate ethanol dispersion, disperse the nano-potassium sulfate in 200ml xylene, add 5g magnesium aluminum carbonate precursor, stir at 80°C for 2 hours, centrifuge, dry, calcinate at 1000°C for 2 hours, wash with water and drying to obtain nano-magnesium-aluminum spinel.

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Abstract

The invention discloses a method for preparing nanometer magnesium aluminum spinel. The method is characterized in that firstly, nanometer size potassium sulfate particles are prepared, and the nanometer potassium sulfate particles are surface modified to make the particles uniformly dispersed in xylene; and dispersion and isolation are performed on carbonate precursor particles of the spinel by using the nanometer potassium sulfate in xylene, after centrifugation precipitation, the precipitate is dried and then is subjected to high-temperature calcination, and the nanometer magnesium aluminumspinel can be obtained after washing. According to the method, the nanometer magnesium aluminum spinel with good dispersibility and perfect crystallization can be rapidly prepared in batch.

Description

technical field [0001] The invention relates to a technology for preparing nano-magnesium-aluminum spinel, which belongs to the technical field of catalysts. Background technique [0002] The catalyst support is one of the components of the supported catalyst. The catalytically active components are carried on the surface of the carrier, and the carrier is mainly used to support the active components, so that the catalyst has a suitable shape, size and mechanical strength to meet the operating requirements of industrial reactors; the carrier can disperse the active components on the surface of the carrier On the other hand, a higher specific surface area can be obtained to improve the catalytic efficiency of the active component per unit mass; the carrier can also prevent the sintering of the active component during use and improve the heat resistance of the catalyst. [0003] Materials used as catalyst supports need to have large specific surface area, stable chemical prop...

Claims

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Application Information

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IPC IPC(8): C01F7/16C01D5/00B82Y30/00B01J21/10
Inventor 董岩夏晓燕卞仙邵起越蒋建清
Owner SOUTHEAST UNIV
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