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Method for preparing high specific surface area nano alumina material

A technology of nano-alumina and high specific surface area, applied in the field of preparation of nano-alumina materials, can solve the problems of high cost, low specific surface area of ​​alumina, complicated process, etc., and achieve low cost, high uniformity and stability, production simple craftsmanship

Inactive Publication Date: 2009-03-25
THE NAT CENT FOR NANOSCI & TECH NCNST OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] The purpose of the present invention is to: in order to solve the problems that the existing alumina preparation method has complex process, high cost, and low specific surface area of ​​alumina; The basic physical properties provide uniform data at home and abroad, and provide traceability for the certification of the specific surface area analyzer; thus providing a simple process, good repeatability and a preparation method for nano-alumina materials with high specific surface area

Method used

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  • Method for preparing high specific surface area nano alumina material

Examples

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Embodiment 1

[0033] Adopt the method for preparing high specific surface area nano-alumina material of the present invention, the specific preparation steps of the gamma-alumina material obtained are as follows:

[0034] 1) Mix 290ml of cyclohexane, 120ml of polyethylene glycol octylphenyl ether and 100ml of n-butanol and stir evenly, divide into two parts of equal volume;

[0035]2) Add 100ml of 1.0M aluminum nitrate aqueous solution dropwise to a part of the above-mentioned organic phase at a rate of 10ml / min, stir while adding dropwise and control the mol ratio of water to surfactant to be 15 to form an aluminum nitrate microemulsion;

[0036] 3) Add 100ml of 2.0M ammonium carbonate aqueous solution dropwise to another part of the above-mentioned organic phase at a rate of 10ml / min, stir while adding dropwise and control the mol ratio of water to surfactant to be 15 to form an ammonium carbonate microemulsion ;

[0037] 4) At 25°C, add the ammonium carbonate microemulsion dropwise at a...

Embodiment 2

[0042] 290ml of cyclohexane, 120ml of polyethylene glycol octylphenyl ether and 100ml of n-butanol were mixed and stirred evenly to form a uniform organic phase, which was divided into two parts of equal volume. Add 100ml of 1.0M aluminum nitrate aqueous solution dropwise to a portion of the above-mentioned organic phase at a rate of 10ml / min, stir while adding dropwise and control the molar ratio of water to surfactant to be 15 to form an aluminum nitrate microemulsion; 100ml of ammonium carbonate aqueous solution of 2.0M is added dropwise in another part of above-mentioned organic phase at the speed of / min, stirs while adding dropwise and controls the mol ratio of water and tensio-active agent to be 15, forms ammonium carbonate microemulsion. At 25°C, the aluminum nitrate microemulsion was added dropwise at a rate of 10ml / min to the stirring ammonium carbonate microemulsion until the pH value was 9, and aged at 60°C for 48 hours after reacting for 3h. Filter the aged slurry...

Embodiment 3

[0044] Mix 290ml of cyclohexane, 120ml of polyethylene glycol octylphenyl ether and 100ml of n-butanol and stir evenly, add 100ml of 1.0M aluminum nitrate aqueous solution to the above organic phase dropwise at a rate of 10ml / min, dropwise Stir while adding and control the molar ratio of water to surfactant to be 15 to form an aluminum nitrate microemulsion; add 100ml of 2.0M ammonium carbonate aqueous solution dropwise at a rate of 10ml / min to the stirring aluminum nitrate microemulsion at 25°C In the emulsion, until the pH value is 9, after 3 hours of reaction, it is aged at 60°C for 48 hours. Filter the aged slurry, wash the filter cake with 1000ml of deionized water and 300ml of absolute ethanol, then vacuum-dry at 120°C for 12 hours, and bake at 500°C for 3 hours to obtain the high specific surface area nano-alumina material prepared in this example .

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Abstract

The invention relates to a method for preparing nano-alumina material with high specific surface area; the method mixes oil phase, surfactant, and cosurfactant in accordance with a certain volume ratio and adds aluminum salt solution, precipitant drop into the organic phase, then a microemulsion system is formed, a reaction is generated in a tiny water droplet by stirring, and later aluminum hydroxide precipitation is obtained. By washing, drying and calcining, nano-alumina is finally formed. The nano-alumina is a Gamma-alumina phase, with the average particular diameter of 5 to 100nm, the specific surface area of 200 to 500m <2> / g, the pore volume of 1.5 to 2.5cm <3> / g, and the average pore diameter of 5 to 60nm. The preparation method has the advantages of simple production process, low cost, strong repeatability, extremely high purity, uniformity and stability of obtained alumina product, can carry out batch production, can be applied to scientific research, petrochemical and building industries, and can also be used as standard material of the specific surface area.

Description

technical field [0001] The invention relates to a preparation method of nano-alumina, in particular to a preparation method of a nano-alumina material with a high specific surface area, which is used in the fields of specific surface area or pore volume standard substance synthesis, scientific research, petrochemical and construction industries and the like. Background technique [0002] Alumina powder material is a widely used industrial product. Due to its high temperature resistance, oxidation resistance, wear resistance, good insulation and large surface area, alumina powder material has been used in fine chemicals, bioceramics, composite Materials, optical and semiconductor materials, and catalytic materials have been widely used in many fields. Among them, γ-alumina, as a catalyst or catalyst carrier material, has been used in the fields of many hydrogenation reaction catalyst carriers in the petrochemical industry and the surface coating of automobile exhaust purifica...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01F7/02
Inventor 朴玲钰刘祥志王琛王孝平
Owner THE NAT CENT FOR NANOSCI & TECH NCNST OF CHINA
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