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Preparation method of high-temperature-resistant alumina with large specific surface area

A technology with large specific surface area and alumina, which is applied in the preparation of alumina/hydroxide, etc., can solve undiscovered problems and achieve the effect of simple production process and good resistance to specific surface area attenuation

Inactive Publication Date: 2014-03-05
重庆海特汽车排气系统有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It can be seen that the current methods of preparing alumina are different, but it has not been found that the method of using pseudobohemite (AL 2 o 3 ·H 2 O) The case of producing alumina as a raw material

Method used

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  • Preparation method of high-temperature-resistant alumina with large specific surface area

Examples

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Embodiment 1

[0022] Example 1: A method for preparing high-temperature-resistant alumina with a large specific surface area is to disperse 10 g of lanthanum nitrate into 200 g of deionized water, and stir to dissolve. During the stirring process, 100 g of pseudo-boehmite powder was added. After stirring evenly, let stand for 3 hours. It was then evaporated to dryness, followed by calcination at 600°C for 2 hours. Alumina sample 1-1 was prepared. An appropriate amount of alumina sample 1-1 was calcined at 1000° C. for 24 hours to obtain alumina sample 1-2.

Embodiment 2

[0023] Example 2: Disperse 10 g of manganese nitrate and 10 g of lanthanum nitrate in 200 g of deionized water, stir to dissolve. 100 g of pseudo-boehmite was added during the stirring process. After stirring evenly, let stand for 3 hours. Evaporate to dryness, and then bake at 600° C. for 2 hours to prepare alumina sample 2-1. An appropriate amount of alumina sample 2-1 was calcined at 1000° C. for 24 hours to obtain alumina sample 2-2.

Embodiment 3

[0024] Example 3: Disperse 10 g of manganese nitrate and 10 g of lanthanum nitrate in 150 g of deionized water, stir to dissolve. Then disperse 100 g of pseudo-boehmite into 150 g of deionized water, and stir evenly to prepare a suspension. Add the stabilizer solution containing manganese nitrate and lanthanum nitrate into the suspension prepared by pseudo-boehmite, stir evenly, and keep stirring for 3 hours. Evaporate to dryness and bake at 600°C for 2 hours to prepare alumina sample 3-1. An appropriate amount of alumina sample 3-1 was calcined at 1000° C. for 24 hours to obtain alumina sample 3-2.

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Abstract

The invention discloses a preparation method of high-temperature-resistant alumina with a large specific surface area. The preparation method comprises the following steps of: adding alkaline-earth metals or rare-earth elements into water or an ethanol aqueous solution for preparing into a stabilizing agent solution; and adding the stabilizing agent solution into a suspension prepared from pseudoboehmite, and performing procedures such as soaking, evaporating to dryness and baking to obtain active alumina. The method disclosed by the invention has a simple process, and is convenient to implement; and moreover, the prepared active alumina is resistant to specific surface area attenuation at high temperature, and can be taken as a supporter of a motor vehicle tail gas purifying catalyst as well as a catalyst or supporter used in other fields.

Description

technical field [0001] The invention relates to a method for preparing alumina, in particular to a method for preparing high-temperature-resistant and large-specific-surface-area activated alumina by using pseudo-bohemite, and belongs to the technical field of preparation of inorganic solid materials. Background technique [0002] Currently, precious metals such as platinum, palladium, and rhodium are mostly used as active components in technical fields such as motor vehicle exhaust purification and methane catalytic oxidation. Especially in motor vehicle exhaust purifiers, the consumption of platinum, palladium, rhodium and other precious metals accounts for 70% of the global total output. However, these precious metal resources are relatively scarce. From the perspective of resource protection, their consumption should be reduced as much as possible; meanwhile, these precious metals are also very expensive, which greatly increases the production cost of the product. [00...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J21/04C01F7/30
Inventor 贾海建沈四和程莎莎段明华周波万波
Owner 重庆海特汽车排气系统有限公司