Preparation method of high-heat stable rare-earth modified alumina

A rare earth modification, alumina technology, applied in alumina/hydroxide preparation, chemical instruments and methods, inorganic chemistry, etc., can solve the problems of high production cost, complicated co-precipitation method steps, etc., and achieve simple and good steps. The effect of high thermal stability

Active Publication Date: 2012-10-03
GANZHOU BOJING TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The impregnation method is difficult to obtain high-performance modified alumina due to uneven solid-liquid reaction; the coprecipitation method has been widely used because of its simple process, easy control of conditions, good product uniformity, low production cost, and convenient industrial production. The existing co-precipitation method has complex steps and high production costs

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Get 136g pseudo-boehmite (Al 2 o 3 : 70%), add deionized water 1500ml, nitric acid solution (mass fraction of nitric acid is 60%) 20ml mixed and stirred to obtain aluminum sol; then add 21ml lanthanum nitrate (TREO: 240g / L) and mix, obtain modified aluminum sol; The modified aluminum sol is added to 2.1mol / L ammonia water with 6% polymeric organic acid for precipitation at room temperature, and the final pH is controlled to be 8.2. After the precipitation is completed, it is vacuum filtered and washed until the conductivity of the lotion is 19ms / cm to obtain modified aluminum hydroxide gel. The modified aluminum hydroxide gel was calcined at 700°C for 4 hours to obtain modified alumina, and its specific surface area was measured to be 155.5m 2 / g, calcined at 1000°C for 10 hours, the aging specific surface area is 107m 2 / g, calcined at 1100°C for 10 hours, the aging specific surface area is 63.3m 2 / g.

Embodiment 2

[0022] Get 136g pseudo-boehmite (Al 2 o 3 : 70%), add deionized water 1500ml, nitric acid solution (mass fraction of nitric acid is 60%) 30ml mixed and stirred to obtain aluminum sol; then add 18ml lanthanum nitrate (TREO: 240g / L) and mix, obtain modified aluminum sol; Add 3.2mol / L ammonia water with 8% high molecular weight organic acid to the modified aluminum sol for precipitation at room temperature, control the final pH to 8.7, vacuum filter and wash until the conductivity of the lotion is 17ms after the precipitation is completed / cm to obtain modified aluminum hydroxide gel. The modified aluminum hydroxide gel was calcined at 700°C for 4 hours to obtain modified alumina, and its specific surface area was measured to be 161m 2 / g, calcined at 11000°C for 10 hours, the aging specific surface area is 112m 2 / g, calcined at 1100°C for 10 hours, the aging specific surface area is 65m 2 / g.

Embodiment 3

[0024] Get 136g pseudo-boehmite (Al 2 o 3 : 70%), add deionized water 1500ml, nitric acid (mass fraction of nitric acid is 60%) 10ml mixed and stirred to obtain aluminum sol; then add 20ml lanthanum chloride (TREO: 220g / L) and mix, obtain modified aluminum sol; Add 4mol / L ammonia water with 10% polymeric organic alcohol to the modified aluminum sol for precipitation at room temperature, control the final pH to 7.5, vacuum filter and wash until the conductivity of the lotion is 13ms / cm, the modified aluminum hydroxide gel was obtained. The modified aluminum hydroxide gel was calcined at 800°C for 2.5 hours to obtain modified alumina, and its specific surface area was measured to be 145m 2 / g, calcined at 1000°C for 10 hours, the aging specific surface area is 107m 2 / g, calcined at 1100°C for 10 hours, the aging specific surface area is 62.6m 2 / g.

[0025] The preparation method of the high-heat-stable rare-earth modified alumina of the present invention has simple steps...

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Abstract

The invention relates to a preparation method of high-heat stable rare-earth modified alumina, comprising the following steps of: 1) reacting pseudoboehmite by nitric acid to generate aluminum sol; 2) taking soluble salt of lanthanum, adding de-ionized water to prepare aqueous solution with the concentration of 100-260g/l; 3) taking the aluminum sol and the soluble salt solution of the lanthanum, and mixing according to the mass ratio of Al2O3 to La2O3 being at 94-97 to 3-6 to obtain modified aluminum sol; 4) uniformly mixing an organic high polymer modifier with 2-6mol of an alkaline precipitator according to the mass ratio 5-10 to 90-95 to obtain a modified alkaline precipitator; 5) mixing the modified aluminum sol with the modified alkaline precipitator, performing co-precipitation; 6) performing vacuum filtration on a modified aluminum hydroxide gel precipitant, and washing; 7) calcining the precipitant in a muffle furnace; and 8) breaking the calcined matter obtained in the step 7) to obtain a modified alumina coating material. The preparation method of the high-heat stable rare-earth modified alumina is simple in steps, and the prepared modified alumina has good high-heat stability.

Description

technical field [0001] The invention relates to a preparation method of high thermal stability rare earth modified alumina. Background technique [0002] Modified alumina is an extremely critical coating material in three-way catalytic purification (TWC), catalytic combustion, diesel engine DOC, and POC purification. It is coated on the surface of the carrier to facilitate the dispersion of cerium-based materials and noble metal active components. The performance of alumina largely determines the performance of the overall purifier. Because most of the above catalytic processes operate at high temperature, the high temperature resistance of modified alumina is very important. [0003] At present, the methods for preparing modified alumina mainly include impregnation method and co-precipitation method. The impregnation method is difficult to obtain high-performance modified alumina due to uneven solid-liquid reaction; the coprecipitation method has been widely used because ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01F7/24C01F7/30
Inventor 熊国槐
Owner GANZHOU BOJING TECH
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