Mesoporous spherical alumina prepared by guiding of template and preparation method thereof

A spherical alumina and template technology, which is applied in chemical instruments and methods, alumina/aluminum hydroxide, catalyst carriers, etc., can solve the problems of cumbersome preparation process, high cost, unfavorable mass transfer and reaction

Inactive Publication Date: 2012-11-07
BEIJING UNIV OF CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the alumina prepared by this method has a certain shape, the preparation process is cumbersome and the cost is high, and besides the spherical shape, other shapes are not conducive to mass transfer and reaction, and the spherical alumina also has a rough surface, and the particle diameter is relatively large. big disadvantage

Method used

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  • Mesoporous spherical alumina prepared by guiding of template and preparation method thereof
  • Mesoporous spherical alumina prepared by guiding of template and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0027] A. Dissolve 10 g of aluminum powder with an average particle size of 50 μm in 200 g of hydrochloric acid with a concentration of 5% wt at 95° C. to prepare an aluminum sol with a transparent appearance and Tyndall effect.

[0028] B. Add 1.89g of ammonium acrylate to the above aluminum sol, stir and mix thoroughly. Then 12g of hexamethylenetetramine was added into the sol and fully dissolved.

[0029] C. Drop the sol of step B into vacuum pump oil at 70°C with a No. 7 dispersing dripper, and the height of the oil column is 300cm. The formed pellets were separated from the oil and aged at 130°C for 5 hours.

[0030]D. The obtained product was washed, dried at 140°C for 10 hours, and calcined at 550°C for 4 hours to obtain a spherical alumina carrier.

[0031] It has been determined that the specific surface area of ​​the spherical alumina carrier is 250m 2 / g, the pore volume is 0.89ml / g, and the bulk density is 0.6g / cm 3 , The average particle size is 1.4mm, the cru...

Embodiment 2

[0033] A. Dissolve 30g of aluminum powder with an average particle size of 100 μm in 300g of hydrochloric acid with a concentration of 10%wt to prepare aluminum sol.

[0034] B. Add 8.5g of acrylamide into the aluminum sol and mix thoroughly, then add 35g of hexamethylenetetramine into the sol to fully dissolve.

[0035] C. Use a No. 7 dispersion dropper to drop into 85°C oil for molding, and the height of the oil column is 300cm. The formed pellets were separated from the oil and aged at 130°C for 5 hours.

[0036] D. The obtained product was washed, dried at 150°C for 10 hours, and calcined at 600°C for 4 hours to obtain a spherical alumina carrier.

[0037] It has been determined that the specific surface area of ​​the spherical alumina carrier is 231m 2 / g, the pore volume is 0.85ml / g, the bulk density is 0.53g / cm 3 , The average particle size is 1.5mm, the crushing strength is 92.4N / grain, and the average pore size is 17.63nm. XRD pattern see figure 1 Curve 2 in the ...

Embodiment 3

[0039] A. Prepare aluminum sol by dissolving 100 g of aluminum powder with an average particle size of 10 μm in 1000 g of hydrochloric acid with a concentration of 15% wt.

[0040] B. Add 56.6g of polyvinyl alcohol into the aluminum sol to dissolve, then add 115g of hexamethylenetetramine into the sol to fully dissolve.

[0041] C. Use a No. 16 dispersion dropper to drop into 95°C oil for molding, and the height of the oil column is 200cm. The formed pellets were separated from the oil and aged at 130°C for 5 hours.

[0042] D. The obtained product was washed, dried at 70°C for 24 hours, and calcined at 600°C for 4 hours to obtain a spherical alumina carrier.

[0043] It has been determined that the specific surface area of ​​the spherical alumina carrier is 210m 2 / g, the pore volume is 0.95ml / g, the bulk density is 0.52g / cm 3 , The average particle size is 2.1mm, the average crushing strength is 85.8N / grain, and the average pore size is 18.38nm. XRD pattern see figure 1...

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Abstract

The invention provides mesoporous spherical alumina and a method for preparing the mesoporous spherical alumina by guiding of a template. By the adoption of an oil column forming method, the template with a guiding function is added into aluminum sol during the aluminum sol preparation process; and during the forming and aging processes of the aluminum sol, due to the existence of the template with the guiding function, a large number of meso-structures are prepared in alumina balls. The mesoporous spherical alumina has the following characteristics of: its specific surface is 150-300 m<2>/g; particle diameter is 0.1-5 mm; pore volume is 0.7-1.5 ml/g; holes, hole diameter of which is 2-40 nm, are greater than 97%; bulk density is 0.30-0.80g/cm<3>; and crushing strength is 70-250 N/granule. The mesoporous spherical alumina can be used as a catalyst or a catalyst carrier in the petrochemical industry and the industry of fine chemicals.

Description

technical field [0001] The invention relates to a template-guided mesoporous spherical alumina and a preparation method thereof. The mesoporous spherical alumina material has a high specific surface area, a large pore volume and a high crushing strength, and can be widely used as a catalyst or a catalyst carrier in petrochemical and industrial industries. in the field of fine chemicals. technical background [0002] Alumina materials are widely used as adsorbents, catalysts, or catalyst supports due to their large specific surface area, good mechanical strength, high thermal stability, suitable surface acid sites, and crystal structure defects. [0003] When alumina is used as a catalyst or catalyst carrier for a catalytic reaction, its pore structure and appearance shape have a great influence on the catalytic reaction. The alumina used in industry has strip shape, column shape, honeycomb shape and spherical shape, etc. Among them, when spherical alumina is used as a fixed...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01F7/02B01J21/04B01J32/00B01J35/10
Inventor 李殿卿韩亚帅冯俊婷冯拥军
Owner BEIJING UNIV OF CHEM TECH
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