Method for mfg. nano alumina

A kind of technology of aluminum oxide and nanometer, applied in chemical instruments and methods, aluminum oxide/aluminum hydroxide, colloid chemistry, etc., can solve problems such as uncontrollable and wide gel particle size distribution

Inactive Publication Date: 2003-03-12
RES CENT FOR ECO ENVIRONMENTAL SCI THE CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The pH in the precipitation reaction process changes with time, and the reaction cannot be controlled within a fixed pH range, and the final gel particle size distribution is wide

Method used

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  • Method for mfg. nano alumina
  • Method for mfg. nano alumina
  • Method for mfg. nano alumina

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0012] Embodiment 1: raw material is aluminum ammonium sulfate, the soluble aluminum salt concentration that is mixed with is 0.1mol / L, and precipitant concentration is ammoniacal liquor: water=1: 3, gets 400ml precipitant, adds emulsifying agent triton 100 respectively, its The addition amount is 0.05vol%, and the additive polyethylene glycol 200 is added at 2.5vol%, vigorously stirred at 40°C for 15 minutes, and 1000ml of soluble aluminum salt solution is added dropwise to obtain a hydrated alumina gel solution, the pH of which is between 9- Between 12; the prepared gel is aged in the mother liquor, the aging time can be 12-24 hours, the present embodiment is aged for 18 hours and then suction filtered, washed 8-10 times with deionized water, washed with anhydrous The water in the gel is exchanged with ethanol several times, dried by supercritical fluid drying method, and the ultrafine particles obtained after drying are calcined at 900°C for 2 hours to obtain nanometer γ-Al ...

Embodiment 2

[0013] Example 2, the raw material is aluminum nitrate, the concentration of the prepared soluble aluminum salt solution is 0.3mol / L, Triton X-155 is added respectively in the precipitation, the addition amount is 0.1vol%, and the additive polyethylene glycol 1540 is added 0.5vol%, stirred vigorously at 40°C for 10 minutes, and added dropwise 1000ml of soluble aluminum salt solution to obtain a hydrated alumina gel solution, the pH of which was between 9-12; roasted at 900°C for 4 hours. All the other are with embodiment 1.

Embodiment 3

[0014] Embodiment 3, the raw material is aluminum trichloride, the concentration of the soluble aluminum salt prepared is 0.2mol / L, Triton X-200 is added respectively in the precipitation, its addition is 0.13vol%, additive polyethylene glycol 1540, Added as 1.5vol%. All the other are with embodiment 1.

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Abstract

A gamma-Al2O3 nanoparticle (less than 20 nm) is prepared through reverse sol-gel method, supercritical fluid drying method, and calcining at 900 deg.C for 2 hr. Its specific surface area is 140 sq.m / g.

Description

technical field [0001] The invention relates to a preparation method of nanometer aluminum oxide. Background technique [0002] Aluminum oxide (Al 2 o 3 ) is one of the important raw materials for industrial catalysts, motor vehicle emission purification catalysts, electronics industry and high-tech ceramics. [0003] Nano-Al 2 o 3 The activity of particles and its application in the field of catalysis are very important, because nano-Al 2 o 3 The small size effect, surface effect, quantum size effect and macroscopic quantum tunneling effect of particles present characteristics that conventional materials do not have, and have broad application prospects in the field of catalysis. Due to the small size of the nanoparticle, the volume percentage of the surface is large, the bonding state and electronic state of the surface are different from those inside the particle, and the incomplete coordination of the surface atoms leads to an increase in the active sites on the su...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J13/00C01F7/02
Inventor 沈迪新陈宏德田群周克斌
Owner RES CENT FOR ECO ENVIRONMENTAL SCI THE CHINESE ACAD OF SCI
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