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High-temperature-resistant and large-specific-surface-area aluminum oxide and preparation method thereof

A technology with a large specific surface area and alumina, applied in the preparation of alumina/hydroxide, chemical instruments and methods, alumina/aluminum hydroxide, etc. Insufficient thermal stability and other problems, to achieve the effect of large specific surface area, large pore volume, and good high temperature resistance

Active Publication Date: 2016-09-21
陈淼
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, most activated aluminas have insufficient thermal stability, are easy to crystallize and sinter, and the specific surface and pore volume are not high, which limits their activity as catalysts or supports in some specific high-temperature reactions.

Method used

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  • High-temperature-resistant and large-specific-surface-area aluminum oxide and preparation method thereof
  • High-temperature-resistant and large-specific-surface-area aluminum oxide and preparation method thereof
  • High-temperature-resistant and large-specific-surface-area aluminum oxide and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] This example provides a kind of alumina with high temperature resistance and large specific surface area, which is prepared by the following method:

[0028] (1) Dissolve 110 parts by weight of aluminum chloride hexahydrate in 500 parts by weight of deionized water, place in a constant temperature water bath at 90°C and stir, then add dropwise NaOH solution with a concentration of 4 mol / L until the precipitation is complete, at which point pH=8.5 ; Then the precipitate is filtered and washed with deionized water, and the resulting filter cake is the solid material A;

[0029] (2) 100 parts by weight of ammonium formate, 2 parts by weight of polyethylene glycol with a molecular weight of 10000 and 10 parts by weight of isopropanol are dissolved in 350 parts by weight of deionized water to form solution B;

[0030] (3) Mix the solid material A with the aqueous solution B, and fully stir the solid material A to obtain a suspension, which is mechanically stirred at a rate o...

Embodiment 2

[0034] The other operating conditions and raw material consumption of this embodiment are the same as those of Example 1, the only difference being that in step (4), the calcination temperature is 950°C.

[0035] Such as figure 2 Shown is the XRD pattern of the finished alumina described in this example. It can be seen from the figure that the finished alumina product obtained by calcination at 950°C is a mixture of δ-alumina and θ-alumina, in which δ-alumina Mainly.

Embodiment 3

[0037] The other operating conditions and raw material consumption of this embodiment are the same as those of Example 1, the only difference is that in step (4), the calcination temperature is 1100°C.

[0038] Such as image 3 Shown is the XRD pattern of the finished alumina described in this example. It can be seen from the figure that the finished alumina product obtained by calcination at 1100°C is a mixture of δ-alumina and θ-alumina, of which θ-alumina is Mainly.

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Abstract

The invention relates to a preparation method for high-temperature-resistant and large-specific-surface-area aluminum oxide. According to the method, a soluble aluminum salt and a soluble ammonium salt are adopted in a suitable molar ratio as raw materials. Firstly, the soluble aluminum salt is dissolved in water to obtain a precursor, and a precipitate is generated by utilizing the precursor in a controlled condition. The precipitate is filtered to obtain a solid material A. Meanwhile, the soluble ammonium salt is dissolved in water to obtain a solution B. The solid material A is fully dispersed in the solution B. After being vigorously stirred, an obtained product is filtered to obtain a filter cake. After the filter cake is successively dried and roasted at 500-1100 DEG C, the aluminum oxide is prepared. The prepared aluminum oxide is good in high temperature resistance, large in specific surface area and large in pore volume. Meanwhile, after the prepared aluminum oxide is subjected to high-temperature treatment at 1100 DEG C for 1-6 hours, the BET specific surface area of the prepared aluminum oxide is larger than 80 m<2> / g, and the pore volume thereof is larger than 0.75 cm<3> / g.

Description

technical field [0001] The invention belongs to the technical field of alumina processing, and in particular relates to a high-temperature-resistant alumina with a large specific surface area and a preparation method thereof. Background technique [0002] Alumina has a wide range of uses in the chemical industry, among which the use of activated alumina is the most common, such as for adsorbents, desiccants, catalysts or catalyst supports. However, most activated aluminas have insufficient thermal stability, are prone to crystal transformation and sintering, and their specific surface and pore volume are not high, which limits their activity as catalysts or supports in some specific high-temperature reactions. With the rapid development of technologies such as catalytic combustion and environmental protection catalysis (such as catalytic purification of automobile exhaust and catalytic purification of toxic and harmful exhaust gases), these applications often require a react...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01F7/30C01F7/02B01J32/00B01J21/04B01J35/10
CPCC01F7/02C01F7/30B01J21/04C01P2002/72C01P2006/12C01P2006/16C01P2006/32B01J35/613B01J35/615B01J35/643B01J35/647
Inventor 许杰
Owner 陈淼