High temperature-resistant activated alumina material and preparation method thereof

A technology of activated alumina and high temperature resistance, which is applied in the field of alumina materials and can solve the problem that the specific surface area of ​​alumina materials is not very high

Active Publication Date: 2012-10-24
浙江欧信环保科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] It can be seen that the specific surface area of ​​alumina materials in the prior art is not very high at high temperature.

Method used

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  • High temperature-resistant activated alumina material and preparation method thereof
  • High temperature-resistant activated alumina material and preparation method thereof
  • High temperature-resistant activated alumina material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] (1) Mix 69.64g macroporous pseudo-boehmite, 69.64g high-viscosity pseudo-boehmite and 6.76g lanthanum nitrate in water, slowly add 30% nitric acid solution dropwise under stirring at 500r / min to PH= 4.0 is in a peptized state, aged at 90°C for 5 hours with constant stirring, added polyethylene glycol solution (containing 40g of polyethylene glycol) at room temperature, stirred evenly to make a slurry, then sprayed and dried at 90°C.

[0028] (2) Put the powder in a muffle furnace and pass air to decompose at 450°C; form the alumina crystal phase at 600°C; stabilize the alumina structure at 900°C.

[0029] (3) Put the product in a crucible and place it in a high-temperature box furnace and pass it into dry air; calcinate at 1000° C. for 5 hours to obtain the product.

[0030] (4) The XRD analysis of the calcined product is δ phase figure 1 , the specific surface area measured by the surface analyzer is 117.61m 2 / g.

Embodiment 2

[0032] (1) Mix 67.85g macroporous pseudo-boehmite, 67.85g high-viscosity pseudo-boehmite and 12.82g cerium nitrate in water, slowly add 30% nitric acid solution dropwise under stirring at 100r / min to PH= 3.5 In peptized state, aged at 95°C for 4.5 hours with constant stirring, added polyvinyl alcohol solution (containing 20g of polyvinyl alcohol) at room temperature and stirred evenly to make a slurry, then sprayed and dried at 90°C.

[0033] (2) (2) with embodiment 1

[0034] (3) (3) with embodiment 1

[0035] (4) The XRD analysis of the calcined product is δ phase figure 2 , the specific surface area measured by the surface analyzer is 111.23m 2 / g.

Embodiment 3

[0037] (1) Mix 68.57g macroporous pseudo-boehmite, 68.57g high-viscosity pseudo-boehmite and 13.93g zirconium nitrate in water, slowly add 30% nitric acid solution dropwise under stirring at 650r / min to PH= 3.9 In peptized state, aged at 95°C for 5 hours with constant stirring, added methylcellulose solution (containing 35g of methylcellulose) at room temperature and stirred evenly to make a slurry, then sprayed and dried at 100°C.

[0038] (2) (2) with embodiment 1

[0039] (3) (3) with embodiment 1

[0040] (4) The XRD analysis of the calcined product is δ phase image 3 , the specific surface area measured by the surface analyzer is 112.55m 2 / g.

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Abstract

The present invention provides a high temperature-resistant activated alumina material and a preparation method thereof. The alumina material is prepared by the following steps: mixing macroporous pseudo-boehmite, high viscosity pseudo-boehmite and an additive by using water; uniformly stirring at a rotation speed of 100-1000 r / min; adding dilute nitric acid with a concentration of 30% to carry out a reaction until the pH value is 2.0-5.5 and the solution is at the peptization state, and then aging for 3-6 hours at a temperature of 80-100 DEG C while stirring; adding a pore-forming agent at a room temperature, and carrying out uniform stirring, pulping, spraying and drying; and carrying out calcination at a temperature of 900 DEG C to prepare the alumina. The alumina material of the present invention has advantages of convenient mass production, high specific surface, and the like, wherein the specific surface of the alumina material of the present invention can be maintained more than 110 m<2> / g for a long time at a temperature of 1000-1100 DEG C. In addition, the preparation method of the alumina material has characteristics of simple process and low cost.

Description

technical field [0001] The invention relates to an alumina material, more specifically to a high-temperature-resistant activated alumina material. At the same time, the present invention also relates to a preparation method of the high temperature resistant alumina material. Background technique [0002] In recent years, in high-temperature harsh environments such as catalytic purification of automobile exhaust and catalytic combustion, the specific surface area of ​​the catalyst carrier has rapidly decreased due to sintering and other reasons, resulting in a decrease in catalyst activity. Therefore, it is urgent to research and develop new catalytic materials with large specific surface area and good thermal stability at high temperature. Activated alumina is a commonly used catalyst carrier, and its specific surface area decreases sharply due to sintering and transformation to α-A1203 at high temperature, so that the catalyst activity is greatly reduced at high temperatur...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01F7/30
Inventor 林
Owner 浙江欧信环保科技有限公司
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