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A nano-γ-al 2 o 3 Synthesis method of powder

A synthesis method and powder technology, which is applied in the field of inorganic metal compound preparation, can solve the problems of harmful gas and organic pollutant emissions, complicated process, low powder purity, etc., and achieve environmental pollution-free, simple operation process, and uniform particle size Effect

Active Publication Date: 2020-02-21
NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

These methods generally have the disadvantages of long calcination time (generally 3-6h), complex process, low powder purity, large particle size, and harmful gas and organic pollutant emissions during the preparation process.

Method used

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  • A nano-γ-al <sub>2</sub> o <sub>3</sub> Synthesis method of powder
  • A nano-γ-al <sub>2</sub> o <sub>3</sub> Synthesis method of powder
  • A nano-γ-al <sub>2</sub> o <sub>3</sub> Synthesis method of powder

Examples

Experimental program
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Effect test

Embodiment 1

[0029] 15.01g of inorganic aluminum salt Al(NO 3 ) 3 9H 2 O and 15.81g agricultural grade chemical fertilizer ammonium bicarbonate (under theoretical conditions, molar ratio n 硝酸铝 :n 碳铵 =1:4, the two react completely, in order to ensure that Al(NO 3 ) 3 9H 2 O can react completely, and ammonium bicarbonate needs to be added in excess, so it is added at a molar ratio of 1:5) Grind them separately and place them in a mortar, and grind them thoroughly for 20 minutes. When the reaction system changes from dispersed solid particles to viscous liquid until the final Until it solidifies, it means that the two raw materials have reacted completely, and the product is placed in a beaker. Add 30 mL of 25% concentrated ammonia water into the beaker to adjust the pH of the reaction system to 9-10, so as to ensure that the generated precursor is basic aluminum ammonium carbonate AACH. Suction filtration to obtain a white precursor solid. Wash the precursor fully with 5mL deionized ...

Embodiment 2

[0032] The reaction conditions are the same as in Example 1, except that the muffle furnace calcination temperature is increased to 850°C, and the calcination is performed for 1.5 hours to obtain nanometer γ-Al 2 o 3 Powder. Figure 4 The middle b curve shows that calcination at 850℃ for 1.5h can obtain nanometer γ-Al with high purity and good crystal form 2 o 3 powder, but by Figure 5 b It can be seen that the γ-Al obtained by calcination at 850℃ for 1.5h 2 o 3 Agglomeration of powder appeared.

Embodiment 3

[0034] The reaction conditions are the same as in Example 1, except that the calcination temperature in the muffle furnace is increased to 950°C, and the calcination is performed for 1.5 hours to obtain nanometer γ-Al 2 o 3 Powder. Figure 4 The XRD pattern of the middle c curve shows the nano-Al prepared at 950°C 2 o 3 In addition to the γ phase, the powder will also produce an α phase, resulting in the prepared Al 2 o 3 The purity of the powder decreases.

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Abstract

A method for synthesizing gamma-Al2O3 nano-powder includes the following steps: respectively grinding an inorganic aluminum salt and ammonium bicarbonate, placing the ground inorganic aluminum salt and ammonium bicarbonate in a mortar according to a certain molar ratio, thoroughly mixing and grinding the obtained mixture to make the mixture completely reacted, and placing the reacted mixture in abeaker; adding 25% concentrated ammonia water to adjust the pH of the above reaction system; performing suction filtration to obtain a precursor ammonium aluminum carbonate hydroxide (AACH); washing the precursor; placing the washed precursor in the beaker, adding certain amounts of a polymer dispersant starch and anhydrous ethanol, and performing ultrasonic dispersion in an ultrasonic cleaner; placing and drying the obtained ultrasonically-treated sample in an oven; and uniformly grinding the dried sample in the mortar, placing the sample in a crucible, and calcining the sample in a muffle furnace at 750-950 DEG C for 1.5-2 h to obtain the gamma-Al2O3 nano-powder. The synthesis method has the advantages of simple operation process, low cost, realization of stable quality, high purity andsmall particle size of the product, low energy consumption, low pollution emission, and easiness in realization of industrialized production.

Description

technical field [0001] The present invention relates to a kind of nano gamma-Al 2 o 3 A method for synthesizing powder belongs to the technical field of preparation of inorganic metal compounds. Background technique [0002] After the 1960s, with the rapid development of science and technology, alumina is not only an important basic raw material for smelting metal aluminum, but also a component of many high-tech important materials. The so-called activated alumina generally refers to nano-γ-Al 2 o 3 , which has the characteristics of porous structure, high specific surface area, good adsorption, good thermal stability and surface acidity, and can be widely used as adsorbent, desiccant, catalyst and catalyst carrier, etc., and its application prospect is very broad. [0003] Currently preparing nanometer γ-Al 2 o 3 There are many methods for powder, the most common of which are: liquid phase precipitation method, sol-gel method, microemulsion method, metal alkoxide hydr...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01F7/02B82Y40/00
CPCC01F7/02C01P2002/72C01P2004/03C01P2004/04C01P2004/32C01P2004/64
Inventor 高慧颖
Owner NORTH CHINA ELECTRIC POWER UNIV (BAODING)