Method for preparing aluminum oxide for catalyst

A technology of alumina and catalyst, which is applied in the field of preparation of alumina for catalyst, can solve the problems of low thermal stability of activated alumina carrier, cannot reach the carrier for automobile exhaust gas purification, etc., and achieves the advantages of reducing production cost and shortening process flow. Effect

Inactive Publication Date: 2012-09-12
GUIZHOU BRANCH CHINA ALUMINUM IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, during the hydrothermal doping process, the rare earth elements and pseudo-boehmite cannot be dispersed and evenly wrapped with each other, so the thermal stability of the activated alumina carrier prepared by it is still low at high temperatures, which cannot reach the level of automobiles. Requirements for carriers for exhaust gas purification

Method used

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Examples

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Effect test

preparation example Construction

[0016] b. In the preparation process of the pseudo-boehmite slurry in step a, any one or both of the above-mentioned modifiers are added in the pseudo-boehmite slurry reaction tank, and the addition of the modifier is approximately 1%~8% of the mass of boehmite slurry, use steam or other heating methods to keep the slurry temperature in the reaction tank at 40~95°C, stir in the tank for 60~300 minutes, and the stirring rate is 250~600 rpm / minute.

[0017] c. After the doping reaction is finished, the slurry is subjected to vacuum filtration for solid-liquid separation, and the separated pseudo-boehmite filter cake is washed with hot pure water at 80~95°C, and then suction-filtered to reduce the pseudo-boehmite filter cake. The content of impurities in the diaspore slurry.

[0018] d. The washed slurry is subjected to liquid-solid separation by spray drying equipment to obtain modified pseudo-boehmite powder, and the dried powder is calcined at 500~800°C to obtain activated ...

Embodiment 1

[0020] Redissolve aluminum hydroxide to prepare sodium aluminate solution, then neutralize the prepared sodium aluminate solution with nitric acid to prepare pseudo-boehmite slurry, and add modifier lanthanum nitrate to the reaction of pseudo-boehmite In the tank, add a modifier according to 1% of the quality of the pseudo-boehmite slurry. The temperature of the slurry in the reaction tank is 45 ° C. Stir in the tank for 120 minutes at a stirring rate of 300 rpm. After the reaction, the slurry Reduce the content of impurities in the pseudo-boehmite slurry by suction filtration and washing, and then spray-dry to obtain modified pseudo-boehmite powder. The dried powder is roasted at 1000~1200°C for 5 hours No α-Al 2 o 3 phase appears, and the specific surface area still reaches 100 m 2 / g.

Embodiment 2

[0022] Redissolve aluminum hydroxide to prepare sodium aluminate solution, then neutralize the prepared sodium aluminate solution with nitric acid to prepare pseudo-boehmite slurry, and use the mixture of zirconium nitrate and cerium nitrate (the ratio of the mixture) as a modification The modifier is added to the reaction tank of pseudo-boehmite, and the modifier is added according to 4% of the mass of the pseudo-boehmite slurry. The temperature of the slurry in the reaction tank is 60°C, and it is stirred in the tank for 240 minutes. The stirring rate is It is 400 rpm, and after the reaction, the slurry reduces the content of impurities in the pseudo-boehmite slurry by suction filtration and washing, and then obtains modified pseudo-boehmite powder after spray drying. There is no α-Al after the powder is calcined at 1000~1200℃ for 5h 2 o 3 phase appears, and the specific surface area still reaches 90 m 2 / g.

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Abstract

A method for preparing aluminum oxide for catalysts relates to the improvement of the preparation method of activated aluminum oxide used in catalysis field such as petrochemical engineering, industrial catalysis, automobile exhaust purification and the like. The method is characterized in that one or any two of lanthanum nitrate, zirconium nitrate and cerium nitrate is / are added in a reaction tank preparing pseudoboehmite and is / are used as modifying agents, and action is performed; slurry is processed through suction filtration, washing and drying after reaction and then modified pseudoboehmite powders are obtained; and the powders that are dried are roasted and then the aluminum oxide for the catalysts is obtained. The method is adopted to process the pseudoboehmite slurry through doping modification, is closely combined with the manufacturing process of the pseudoboehmite, effectively simplifies the manufacturing technology, lowers the manufacturing cost, achieves good surface modification effect, improves the heat stability of activated aluminum oxide powders, and improves the service performance of the activated aluminum oxide powders.

Description

technical field [0001] The invention discloses a method for preparing alumina used as a catalyst, and relates to an improvement of a method for preparing activated alumina used in catalytic fields such as petrochemical industry, industrial catalysis, and automobile tail gas purification. Background technique [0002] γ-Al 2 o 3 It is a transitional alumina with a large specific surface area. Because of its adjustable pore structure, high specific surface area and good thermal stability, it has a wide application prospect in the fields of catalyst carriers and catalysts. . At present, it is mostly used in catalytic fields such as petrochemical catalysis and motor vehicle exhaust purification. [0003] At present, the activated alumina used for exhaust gas purification at home and abroad is mainly obtained by calcining pseudo-boehmite at a certain temperature as a precursor. In foreign markets, pseudo-boehmite is mainly prepared by the organoalcohol aluminum method. The pr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/10B01J21/06
Inventor 耿红娟樊大林王建立宋为聪刘明珠姜雪琴马艳红贾春燕
Owner GUIZHOU BRANCH CHINA ALUMINUM IND
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