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Method for preparing ordered mesoporous aluminium oxide

An ordered mesoporous and alumina technology, applied in the direction of aluminum hydroxide preparation, alumina/hydroxide preparation, chemical/physical/physicochemical mobile reactors, etc., to achieve large specific surface area, rapid microscopic mixing, and operation safe effect

Inactive Publication Date: 2007-08-29
BEIJING UNIV OF CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the application of high gravity technology to the preparation of ordered mesoporous materials has not been reported

Method used

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  • Method for preparing ordered mesoporous aluminium oxide
  • Method for preparing ordered mesoporous aluminium oxide
  • Method for preparing ordered mesoporous aluminium oxide

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0048] A. With the 0.6mol / l aluminum nitrate solution of 2200ml preparation, add the polyethylene glycol of 0.9g as templating agent;

[0049] B. After dissolving, add it to the supergravity reactor (as shown in Figure 1), maintain the supergravity level at 140g, and the reaction temperature is 70°C, and add 1650ml / l of 0.6mol / l ammonium carbonate at a rate of 8ml / min solution, when the pH value at the end of the reaction reaches 7, an alumina hydrate sol is obtained.

[0050] C. Aging the obtained alumina hydrate sol at 70°C for 6 hours. The aged alumina hydrate sol is filtered by a vacuum pump, and the filter cake is washed with water for 2-3 times, and dried at 80°C to obtain aluminum hydrate powder.

[0051] D. Calcining the obtained alumina hydrate powder, the specific calcination process is: under the protection of nitrogen, the temperature is raised to 330°C at a speed of 3°C / min, and maintained for 3 hours, and then the temperature is raised to 550°C at a speed of 3°C...

Embodiment 2

[0054] A. With the 0.1mol / l aluminum nitrate solution of 2200ml preparation, add the polyethylene glycol of 0.9g as templating agent;

[0055] Other steps are with embodiment 1.

[0056] The prepared alumina has a specific surface area of ​​254m 2 / g, the pore volume is 0.28cm 3 / g, the pore size is 4.7nm. Through nitrogen isotherm adsorption-desorption curve analysis (shown in Figure 7), the adsorption curve is a VI-type curve, and Figure 8 shows that the pore size distribution is narrowed, indicating that its order is enhanced.

Embodiment 3

[0058] The operation is the same as in Example 1, except that the aging time is 12 hours and the aging temperature is 30°C.

[0059] The prepared alumina has a specific surface area of ​​301m 2 / g, the pore volume is 0.28cm 3 / g, the pore size is 5.4nm. Through nitrogen isotherm adsorption-desorption curve analysis (shown in Figure 9), the adsorption curve is a VI-type curve, and the obvious H ring becomes larger. Figure 10 shows that the pore size distribution is relatively narrow, and its mesoporous characteristics are obvious.

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Abstract

The invention relates to a manufacturing method for ordered medium aperture alumina that includes the following steps: adding surface activator into inorganic aluminum salt as template agent, making precipitant solution, adding inorganic aluminum salt solution into hypergravity reactor, adding precipitant, when the reacting solution reaching a certain pH value, the precursor sol would be gained; taking aging, filtering, washing, and drying to the precursor sol to gain precursor powder. The powder could be made into ordered medium aperture alumina after taking sintering. The invention has the advantages of simple technology, safe to operate, low cost, etc. The specific surface of the product reaches 250-300m2 / g, and the shape has certain orderliness. It has crucial application value in adsorption and catalyzing process.

Description

technical field [0001] The invention belongs to the field of preparation of nanostructure materials, in particular to the batch preparation of ordered mesoporous alumina. Background technique [0002] Alumina is a porous, highly dispersed solid material with good adsorption properties, surface acidity and thermal stability. It can be used as adsorbent, catalyst and carrier in many chemical processes. Ordered mesoporous alumina is a new type of nanostructure material with large specific surface, pore size between 2-50nm, narrow pore size distribution and orderly pore size and shape. With the rapid development of petrochemical and material science, especially driven by the research results of mesoporous molecular sieve MCM-41, the preparation technology of ordered mesoporous alumina has begun to attract people's attention. [0003] Alumina with an ordered mesoporous structure has a variety of excellent physical and chemical properties compared with traditional alumina. It h...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01F7/30C01F7/34B01J19/28
Inventor 郭奋赵瑞红陈建峰
Owner BEIJING UNIV OF CHEM TECH
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