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Method for preparing porous aluminum oxide aerogel

A technology of porous alumina and aluminum hydroxide gel, applied in the direction of alumina/aluminum hydroxide, which can solve the problems of difficult control of synthesis cost, water-sensitive hydrolysis speed, etc.

Active Publication Date: 2015-04-22
CHINA SHENHUA ENERGY CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The preparation method of the present invention can overcome the problems that the organic alkoxide method is sensitive to water, the hydrolysis speed is fast and difficult to control, and the synthesis cost is high, and the process is simple

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039]Fly ash and hydrochloric acid were mixed according to the mass ratio of 0.65 (the total weight of the two is 100kg), acid leaching reaction was carried out at 120°C for 2 hours, and a crude aluminum chloride solution was obtained by filtration. Add 20wt% sodium hydroxide solution to the crude aluminum chloride solution to adjust the pH to 9, and filter it statically to obtain a pure sodium metaaluminate solution. The sodium metaaluminate solution is adjusted to a pH of 8 with hydrochloric acid to form a sol—aluminum hydroxide sol. The aluminum hydroxide sol was dried in an oven at 50°C for 3 hours to form an aluminum hydroxide gel. The aluminum hydroxide gel was soaked and aged in n-butanol at 50°C for 16 hours to enhance the network structure of the gel and remove impurities. The aged gel was placed in a high-pressure reactor, and carbon dioxide was used as the supercritical drying medium (fluid) and kept at 40°C for 3 hours, then the fluid in the reactor was released,...

Embodiment 2

[0041] Fly ash and hydrochloric acid are mixed according to the mass ratio of 0.80 (the total weight of the two is 100kg), the acid leaching reaction is carried out at 150 ° C for 2 hours, and the crude aluminum chloride solution is obtained by filtration. Add 20wt% sodium hydroxide solution to the crude aluminum chloride solution to adjust the pH to 9, and filter it statically to obtain a pure sodium metaaluminate solution. The sodium metaaluminate solution was adjusted to pH 8 with hydrochloric acid to form aluminum hydroxide sol. The aluminum hydroxide sol was dried in an oven at 50° C. for 3 hours to form an aluminum hydroxide gel. The aluminum hydroxide gel was soaked and aged in n-butanol at 50°C for 24 hours to enhance the network structure of the gel and remove impurities. The aged gel was put into a high-pressure reactor, and carbon dioxide was used as a supercritical drying medium (fluid) and kept at 40°C for 5 hours to release the fluid in the reactor. After the in...

Embodiment 3

[0043] Fly ash and hydrochloric acid are mixed according to the mass ratio of 0.80 (the total weight of the two is 100kg), the acid leaching reaction is carried out at 150 ° C for 2 hours, and the crude aluminum chloride solution is obtained by filtration. Add 20wt% sodium hydroxide solution to the crude aluminum chloride solution to adjust the pH to 9, and filter it statically to obtain a pure sodium metaaluminate solution. The sodium metaaluminate solution was adjusted to pH 8 with hydrochloric acid to form aluminum hydroxide sol. The aluminum hydroxide sol was dried in an oven at 50° C. for 3 hours to form an aluminum hydroxide gel. The aluminum hydroxide gel was soaked and aged in n-butanol at 50°C for 8h to enhance the network structure of the gel and remove impurities. The aged gel was put into a high-pressure reactor, and carbon dioxide was used as a supercritical drying medium (fluid) and kept at 40°C for 5 hours to release the fluid in the reactor. After the internal...

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Abstract

The invention discloses a method for preparing a porous aluminum oxide aerogel. The method comprises the following steps: a, leaching with acid; b, preparing a water-soluble meta-aluminate solution; c, preparing aluminum hydroxide gel; d, aging aluminum hydroxide gel and removing impurity; and e, carrying out supercritical drying. The method, compared with the conventional method, has the advantages of low energy consumption, cheap raw materials, low production cost and broad process technical conditions. By the method, the problems that the organic alcohol salt method is sensitive to water, the hydrolysis speed is high and difficult to control and the synthetic cost is high can also be overcome.

Description

technical field [0001] The invention belongs to the field of comprehensive utilization of solid waste, and in particular relates to a preparation method of porous alumina airgel. Background technique [0002] Airgel is a gelled material whose dispersion medium is gas. It has a nanoporous structure and is widely used in heat insulation and sound insulation, high-energy particle detectors, drug carriers, catalysts, catalyst carriers, nuclear waste storage, and cosmic dust collection. devices and other fields. It is precisely because of the use of airgel that the great development of material science has been promoted, and many scientific and technical problems have also been solved. In recent years, more and more researchers have devoted themselves to the development and utilization of aerogels. So far, people have successfully synthesized many kinds of aerogels, including: C, SiO 2 、TiO 2 and Al 2 o 3 Wait. [0003] Alumina airgel has received more attention, mainly be...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01F7/02
CPCC01F7/02
Inventor 郭昭华
Owner CHINA SHENHUA ENERGY CO LTD
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