Method for preparing light temperature-resistance high surface area alumina and aluminiferous composite oxide

A high surface area, alumina technology, applied in alumina/aluminum hydroxide, aluminum compounds, chemical instruments and methods, etc., can solve the problem of high cost, reduce raw material and production costs, facilitate realization, and achieve the effect of small particle size

Inactive Publication Date: 2004-09-15
EAST CHINA UNIV OF SCI & TECH
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

Literature (Andrey J.Zarur, Henry H.Hwu and Jackie Y.Ying, Reverse microemulsion-mediated synthesis and structural evolution of barium hexaaluminate nanoparticles.Langmuir, 2000, 16: 3042-3049) reported the use of inverse microemulsion as a medium for barium hexaluminate nanoparticles. Nanoscale barium hexaaluminate was successfully synthesized by hydrolysis and polycondensation of aluminum alkoxide, and the specific surface area can still be maintained at 100m after being subjected to a high temperature of 1300°C 2 More than / g, its shortcoming is that the starting raw material that adopts is alkoxide, especially a large amount of use of barium isopropoxide, makes the cost of raw material very high

Method used

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  • Method for preparing light temperature-resistance high surface area alumina and aluminiferous composite oxide
  • Method for preparing light temperature-resistance high surface area alumina and aluminiferous composite oxide
  • Method for preparing light temperature-resistance high surface area alumina and aluminiferous composite oxide

Examples

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Embodiment 1

[0036] Synthesis of Al by Inverse Microemulsion Method 2 o 3 .

[0037] With polyethylene glycol octyl phenyl ether as surfactant, n-hexanol as co-surfactant, and cyclohexane as oil phase, wherein surfactant / co-surfactant / cyclohexane=5 / 6 / 37( Volume ratio).

[0038] In the preparation process, surfactant, co-surfactant, and cyclohexane are mixed in the above ratio, and after stirring evenly, it is divided into two parts, each part is 430ml, and the nitric acid concentration of 27.3wt% is added dropwise to one of them. Aqueous aluminum solution, the addition is 50ml, stirs while adding dropwise, until clear and transparent, the gained mixture is the inverse microemulsion of aluminum nitrate;

[0039] In the other portion, dropwise add ammoniacal liquor with a concentration of 25-28%, in an amount of 50ml, and stir while adding dropwise, to obtain a light blue clear transparent liquid that is an inverse microemulsion of ammoniacal liquor.

[0040] At room temperature, the rev...

Embodiment 2

[0042] Synthesis of Ba-modified Al by Inverse Microemulsion Method 2 o 3 .

[0043] Adopt the used tensio-active agent of embodiment 1, co-surfactant and oil phase, prepare the inverse microemulsion of aluminum nitrate and ammoniacal liquor in the same ratio, difference is that 0.14g barium nitrate has been added in the aqueous solution of aluminum nitrate. Other synthetic processes are the same as in Example 1. figure 2 (1) is the BET specific surface area of ​​the obtained samples after firing under different conditions. The results showed that the specific surface area was 89.7m after being calcined at 1100°C for 10h. 2 / g, higher than that of pure Al prepared by the same method 2 o 3 specific surface area. Literature (Acta Physicochemical Society, 2001, 17(11): 1036-1039) reported that barium-modified Al 2 o 3 After calcination at 1100℃ for 10h, its surface area is 41m 2 / g; Barium-modified Al prepared by the sol-gel method (Chemical Journal of Chinese Universiti...

Embodiment 3

[0045] Synthesis of silicon-modified Al by inverse microemulsion method 2 o 3 .

[0046] The surfactant, co-surfactant and oil phase used in Example 1 were used to prepare the inverse microemulsion of aluminum nitrate and ammoniacal liquor in the same proportion, except that 1.3g orthosilicate was added in the aqueous solution of aluminum nitrate ethyl ester. Other synthetic processes are the same as in Example 1. image 3 In (1) is the specific surface area value of the obtained sample after roasting under different conditions. After roasting at 1100°C for 10 hours, the specific surface area can be maintained at 174.9m 2 / g, much higher than that of pure Al prepared by the same method 2 o 3 specific surface area. Silicon-modified Al prepared by sol-gel method 2 o 3 After being treated under the same conditions, its surface area is 116.7m 2 / g (comparative example 3).

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Abstract

The invention discloses a method to prepare high-temperature high-surface area aluminum oxide and aluminous compound oxide. It uses surface-active agent, assistant surface-active agent, non-water soluble organic solvent, water, inorganic salt and basic material as raw materials to manufacture two reversed-phase microemulsions, then mixing the two microemulsions to react and produce sol, and then filtering, drying, baking, etc, to obtain high-thermal stability aluminum oxide and aluminous compound oxide. When they are baked at 1000 deg.C for 10h, their specific surface area are both kept at 50 sq m / g above, for an example, when the modified aluminum oxide is baked at 1100 deg.C for 10h, its specific surface area is 185.2 sq m / g. Their particle sizes are uniformly distributed and can be controlled. The raw materials are cheap and easy to obtain.

Description

technical field [0001] The invention relates to a method for synthesizing high-temperature-resistant high-surface-area alumina and aluminum-containing composite oxide materials, in particular to a method for preparing alumina and aluminum-containing composite oxides by adopting an inverse microemulsion method. Background technique [0002] Oxide and composite oxide materials (such as alumina and aluminum-containing composite oxides) used in high-temperature environments and operating conditions are high-performance carrier materials for motor vehicle exhaust purification catalysts and methane catalytic combustion catalysts, and have a wide range of uses. As a high-performance carrier material, parameters such as particle size, particle size, high temperature resistance and specific surface area that can be maintained after high-temperature calcination of alumina and aluminum-containing composite oxide materials will affect the performance of automobile exhaust purification ca...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01F7/00C01F7/02
Inventor 卢冠忠王晓红郭耘王幸宜王筠松刘晓晖
Owner EAST CHINA UNIV OF SCI & TECH
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