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Preparation method of low-sodium active aluminum oxide

A technology of activated alumina and alumina, applied in chemical instruments and methods, aluminate/alumina/aluminum hydroxide purification, inorganic chemistry, etc., can solve problems such as high cost, high sodium, silicon content, high impurity content, etc. , to achieve the effects of low production cost, porous volume, and simple preparation method

Inactive Publication Date: 2011-05-25
GUIZHOU BRANCH CHINA ALUMINUM IND
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Problems solved by technology

In foreign markets, pseudo-boehmite is mainly prepared by the organoalcohol aluminum method. The product has the advantages of high purity and good activity. However, due to the high cost of this method, the activated alumina after calcination is expensive, which limits its application range; while the domestic main The preparation of pseudo-boehmite by the carbon fractionation method of sodium aluminate solution has the advantages of abundant raw materials and low production cost. High, unable to meet the purity requirements of activated alumina for automobile exhaust purification

Method used

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preparation example Construction

[0016] A method for preparing low-sodium activated alumina, using Na 2 Aluminium hydroxide with an O content of 0.1%-0.5% and a particle size of 50-100μm is calcined at 400-600°C to obtain the intermediate product ρ-alumina, which is formulated into a slurry with a concentration of 100-500 g / l. Perform hydrothermal treatment at 90-200℃ for 0.5-6 hours, add one or two of nitric acid, acetic acid, citric acid, and one or two of polyethylene glycol, polyvinyl alcohol, and methylcellulose A kind of pore expander, the dosage is 0.1-10% and 0.1-40% of the alumina mass. After the hydrothermal reaction, the ρ alumina after the hydrothermal treatment is filtered and washed with hot pure water at 50℃~95℃. Neutral, dry at a temperature of 60°C to 150°C, and the dried powder is mechanically broken up and calcined at 600-800°C for 2-4 hours to obtain activated alumina.

[0017] The steps are:

[0018] a. First adopt Na 2 Aluminium hydroxide with an O content of 0.1%-0.5% and a particle size of...

Embodiment 1

[0022] The present invention uses Na 2 Aluminum hydroxide with an O content of 0.1% and a particle size of 60 μm is calcined at 400°C to obtain an intermediate product of rho alumina, which is formulated into a slurry with a concentration of 100 g / L, and subjected to hydrothermal treatment at 120°C for 4 hours. Among them, nitric acid and polyethylene glycol are added, and the amounts are respectively 0.2% and 0.5% of the alumina mass. After the hydrothermal reaction, the rho alumina after the hydrothermal treatment is filtered and washed with 95 ℃ hot pure water, and washed until it is neutral. Drying at a temperature of 60°C, the dried powder is broken up by a dispersing machine, and calcined at 600°C for 4 hours to obtain activated alumina. Na 2 O content is 0.041%, specific surface area=172m 2 / g, pore volume=0.48ml / g, average particle size (d 50 ): 50μm.

Embodiment 2

[0024] The present invention uses Na 2 Aluminum hydroxide with an O content of 0.2% and a particle size of 40 μm is calcined at 500°C to obtain an intermediate product of rho alumina, which is formulated into a slurry with a concentration of 300 g / l, and subjected to hydrothermal treatment at 90°C for 2 hours. Among them, acetic acid and polyethylene glycol are added, and the dosage is 0.1% of the alumina mass. After the hydrothermal reaction, the rho alumina after the hydrothermal treatment is filtered and washed with hot pure water at 75°C, and washed to neutrality at 80°C. After drying at a lower temperature, the dried powder is broken up by a dispersing machine and calcined at 700°C for 4 hours to obtain activated alumina. Na 2 O content is 0.046%, specific surface area=168m 2 / g, pore volume=0.5ml / g, average particle size (d 50 ): 30μm.

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Abstract

The invention relates to a preparation method of low-sodium active aluminum oxide, in particular to a preparation method of active aluminum oxide used as catalyst carrier for cleaning automobile tail gas. The method is characterized by comprising the following steps: roasting aluminum hydroxide to obtain an intermediate product rho aluminum oxide, adding a sodium removal agent and a pore expanding agent to carry out hydrothermal treatment, filtering the treated slurry, washing with hot pure water, drying, dispersing the dried product with a dispersion machine, and calcining to obtain active aluminum oxide. In the method provided by the invention, any one or more than two of nitric acid, acetic acid and citric acid is / are used as the sodium removal agent to wash the intermediate product after the roasting of aluminum hydroxide, thereby lowering the sodium content. The low-sodium active aluminum oxide prepared from aluminum hydroxide has the advantages of larger specific surface, multiple pores, high pore volume, simple preparation method and lower production cost.

Description

Technical field [0001] A method for preparing low-sodium activated alumina relates to a method for preparing activated alumina as a catalyst carrier for purifying automobile exhaust. Background technique [0002] Activated alumina has a large specific surface area, a variety of pore structures and pore size distributions, as adsorbents, catalysts, catalyst carriers, etc., used in medicine, chemical industry, water purification, chemical analysis, waste gas treatment and other fields. [0003] The automobile exhaust purification catalyst uses a variety of catalyst metals to simultaneously purify HC (carbon nitrogen compounds), CO (carbon monoxide), and NOx (nitrogen oxides). Therefore, it is required that the activated alumina as the catalyst carrier has a large Specific surface area, lower content of harmful impurities and higher thermal stability. [0004] At present, activated alumina for exhaust gas purification at home and abroad is mainly produced by calcination at a certain te...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01F7/44C01F7/46B01J32/00B01J21/04
Inventor 马艳红王建立
Owner GUIZHOU BRANCH CHINA ALUMINUM IND
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