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Method for preparing integral macroporous alumina

A monolithic, large-pore technology, applied in chemical instruments and methods, alumina/aluminum hydroxide, catalyst carriers, etc., can solve the problems of disconnected pores, excessive filling, and reduced mechanical strength, and achieve a simple and easy preparation process , simple operation, cheap raw materials

Inactive Publication Date: 2008-06-18
TIANJIN UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

On the one hand, this method is filled unevenly due to the volatilization of alcohol, resulting in a decrease in mechanical strength; on the other hand, the alcohol sol has good wettability with the organic template, resulting in excessive filling, resulting in disconnected channels and reduced pore volume.

Method used

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  • Method for preparing integral macroporous alumina

Examples

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Embodiment 1

[0020] (1) Preparation of monolithic macroporous polystyrene template by inverse concentrated emulsion method

[0021] Styrene and divinylbenzene monomers were washed 4 times with an equal volume of 0.2 mol / L NaOH solution, and then washed 4 times with an equal volume of deionized water for later use. Accurately weigh 6 mL of washed styrene and 1.5 mL of divinylbenzene, and put them into a 100 mL three-necked bottle. Add 0.062g of initiator azobisisobutyronitrile and 0.54g of surfactant Span 80 therein, and stir at 400r / min to make them evenly mixed. Slowly add 33.9 mL of deionized water dropwise into the three-necked flask under stirring, and the dropping time is controlled at 60 min to form a reverse-phase thick emulsion. After continuing to stir for 30 minutes, the concentrated emulsion was moved into a mold, and placed in a constant temperature oven at 60°C for polymerization for 24 hours. The polymerized template was dried at 60° C. for 48 hours to obtain a monolithic m...

Embodiment 2

[0029] Prepare monolithic macroporous alumina by the method described in embodiment 1, Al 2 o 3 The preparation method of the sol is as follows: Accurately weigh 4.000g of pseudoboehmite (AlOOH), add it into a round-bottomed flask containing 50mL of deionized water under stirring conditions, add concentrated nitric acid for peptization, adjust pH=3.5, and Stirring and aging for 2h, translucent Al 2 o 3 Sol. The monolithic macroporous Al oxide prepared by this method 2 o 3 The average pore diameter is 14 μm.

Embodiment 3

[0031] The preparation method and process were the same as in Example 1, but the volume of deionized water added in step (1) was changed to 22.5mL, and the monolithic macroporous Al oxide 2 o 3 The average pore diameter is 8 μm.

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Abstract

The invention discloses a preparation method of integrated large-hole alumina, belonging to a preparation technique of integrated multi-hole inorganic oxide. The method comprises the following process: reverse concentrated emulsion method is adopted to prepare integrated large-hole organic template taking cinnamene and divinylbenzene as monomer; aluminum isopropoxide or pseudoboehmite is primarily used for preparing Al2O3 hydrosol; the Al2O3 hydrosol is filled into the integrated large-hole organic template; the filled integrated organic / inorganic composites are dried and then are roasted to remove the template, so as to obtain the integrated large-hole alumina. The invention has the advantages of simple and feasible preparation process, moreover the prepared integrated large-hole alumina has micrometer grade communicated large-hole channels (1-50um). The invention is applicable for catalyst carrier, absorption materials and separation materials.

Description

technical field [0001] The invention relates to a method for preparing monolithic macroporous alumina, which belongs to the preparation technology of monolithic porous inorganic oxides. Background technique [0002] Integral macroporous oxides have attracted much attention due to their micron to millimeter-scale macropores, high specific surface area, high damping performance, good thermal stability, and low dielectric constant, and are widely used in catalysts. Carriers, adsorption materials, separation materials, chromatographic packing, sound-absorbing and shock-absorbing materials, optical fiber communication and other fields. [0003] Currently, monolithic macroporous oxides are prepared using an organic template method. The method uses a monolithic organic polymer with a macroporous structure as a template, and the preparation steps mainly include: (1) preparation of the monolithic organic template; (2) preparation of the precursor solution of the target product; (3) ...

Claims

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Application Information

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IPC IPC(8): C01F7/02B01J32/00B01J20/08
Inventor 刘源张媛梁皓赵存雨
Owner TIANJIN UNIV
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