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Method for preparing ordered mesoporous aluminum oxide in batch

An ordered mesoporous and alumina technology, applied in the direction of alumina/hydroxide, etc., can solve the problems of difficult control of process conditions, difficulty in realizing industrialization, and large specific surface area, and achieve easy industrial scale-up production, low cost, and relatively low cost. The effect of large surface area

Inactive Publication Date: 2009-03-04
BEIJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] Although the ordered mesoporous alumina synthesized by the above method has a large specific surface area and a large pore size, most of the expensive organic aluminum sources and templates are used, and the cost is high, the process conditions are difficult to control, and it is difficult to realize industrialization.

Method used

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  • Method for preparing ordered mesoporous aluminum oxide in batch
  • Method for preparing ordered mesoporous aluminum oxide in batch
  • Method for preparing ordered mesoporous aluminum oxide in batch

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Add 0.9 g of polyethylene glycol to 2200 ml of the prepared 0.1 mol / l aluminum nitrate solution as a template; the reaction temperature is 70°C. Add 1650ml / l prepared 0.6mol / l ammonium carbonate solution at a rate of 8ml / min. When the pH value at the end of the reaction reaches 8, the inorganic precursor sol is obtained. The obtained inorganic precursor sol was aged at 70°C for 6 hours, and the aged inorganic precursor sol was filtered by a vacuum pump, and the filter cake was washed with water for 3 times, and dried at 80°C to obtain inorganic precursor powder. The obtained inorganic precursor powder is calcined. The specific calcination process is: under the protection of nitrogen, the temperature is raised to 330°C within 1 hour at a speed of 3°C / min1, maintained for 3 hours, and then the temperature is raised at a speed of 3°C / min1 within 1 hour under the condition of oxygen. to 550°C and maintained for 3 hours. Ordered mesoporous alumina is obtained after calcina...

Embodiment 2

[0030] Add 0.9 g of polyethylene glycol to 2200 ml of the prepared 0.1 mol / l aluminum nitrate solution as a template; the reaction temperature is 60°C. Add 1650ml / l prepared 0.6mol / l ammonium carbonate solution at a rate of 8ml / min. When the pH value at the end of the reaction reaches 7, the inorganic precursor sol is obtained. The obtained inorganic precursor sol was aged at 50°C for 6 hours, the aged inorganic precursor sol was filtered by a vacuum pump, the filter cake was washed twice with water, and dried at 80°C to obtain inorganic precursor powder. The prepared alumina has a specific surface area of ​​262m2 / g, the pore volume is 0.28nm, and the pore diameter is 4.3nm. According to the nitrogen isotherm adsorption-desorption curve analysis, the adsorption curve is a type VI curve, and the pore distribution is relatively narrow, indicating strong order.

Embodiment 3

[0032] The operating parameters are the same as in Example 1, except that the aging temperature is 20°C. The prepared alumina has a specific surface area of ​​201m 2 / g, the pore volume is 0.28nm, and the pore diameter is 5.5nm. According to the nitrogen isotherm adsorption-desorption curve analysis, the adsorption curve is a VI curve, but the H ring is close to the I type, and the pore distribution moves relatively to the mesopore range and the pore distribution becomes narrower, indicating that the mesopore order is enhanced.

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Abstract

The invention relates to a method for batch-preparing organized mesoporous alumina, which belongs to the nano structure material preparation field. In the method, a surface active agent is added to be used as a template agent after inorganic aluminum salting liquid is manufactured; precipitator liquid is confected at the same time; the confected precipitator is added at certain speed to obtain an inorganic precursor sol. The obtained inorganic precursor sol is processed through aging, then filtration, washing and drying to obtain inorganic precursor powders; the obtain inorganic precursor powders are calcined according to the set calcination process under nitrogen atmosphere to obtain the organized mesoporous alumina. The method has simple technology, safe operation and low cost, and is easy for industrialized enlarged production. The prepared mesoporous alumina has the advantages of large specific surface area (250 to 300m<2> / g), narrow pore-size distribution, vermiform pore canal, sequential size and shape, and important application value during the absorption and catalysis 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 certain order in 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 alum...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01F7/02
Inventor 田英良孙诗兵张继光
Owner BEIJING UNIV OF TECH
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