Preparation of high temperature-resistant active aluminum oxide

A technology of activated alumina and high temperature resistance, which is applied in the preparation of alkali metal aluminate/alumina/aluminum hydroxide, etc., can solve the problems of low yield, sharp reduction in surface area, loss of catalyst activity, etc., and achieves low production cost and high temperature. Good thermal stability and uniform pore size distribution

Inactive Publication Date: 2008-11-12
SHENYANG POLYTECHNIC UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The three-way catalyst is mainly composed of carrier, coating (the main substance is alumina) and active components. Since the temperature of automobile exhaust often reaches very high temperature, it is easy to make γ-Al 2 o 3 surface sintering and α-Al 2 o 3 Crystal transformation, which will cause Al 2 o 3 The surface area is drastically reduced and the catalyst loses activity
In recent years, researchers at home and abroad have conducted a lot of research on improving the thermal stability of alumina, but with little success. Therefore, improving the high-temperature anti-sintering and anti-α phase transition of the catalyst coating is the key to improving the quality of the catalyst and prolonging its life. Problems that need to be solved urgently

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0013] Take 500mL of 1mol / L nitric acid solution in a four-necked round-bottomed flask placed in a water bath (the middle port is placed for stirring, and the remaining three ports are respectively placed with a pH meter, condenser tube and rubber stopper), and when the nitric acid solution reaches 100 ° C, start Stirring 500rpm, sodium aluminate solution (Na 2 O 100g / L, α k 1.40) was slowly added until the pH value of the mixed solution reached 5.5. Keeping its pH, temperature and stirring speed constant, add 20g / L pore-enlarging agent glucose, carry out solid-liquid separation after aging for 24h, wash the obtained solid three times with deionized water and mix with 24mL (0.5mol / L) The mixed solution consisting of nitric acid and 0.1wt% stabilizer lanthanum oxide was mixed uniformly, put into a vacuum drying oven at 80°C for 4 hours, and then put into a muffle furnace and baked at 650°C for 4 hours to obtain high-temperature-resistant activated alumina.

Embodiment 2

[0015] Take 500mL of 1mol / L nitric acid solution in a four-necked round-bottomed flask placed in a water bath (the middle port is placed for stirring, and the other three ports are respectively placed with a pH meter, condenser tube and rubber stopper), and when the nitric acid solution reaches 90°C, start Stirring 800rpm, sodium aluminate solution (Na 2 O 120g / L, α k 1.35) was slowly added until the pH value of the mixed solution reached 6. 4g / L pore-enlarging agent EDTA was added under the condition of keeping its pH, temperature and stirring speed constant, and solid-liquid separation was carried out after aging for 12 hours. The mixed solution consisting of nitric acid and 2wt% stabilizer lanthanum oxide was mixed evenly, then put into a vacuum drying oven at 60°C for 24h, and then put into a muffle furnace and baked at 500°C for 6h to obtain high temperature resistant activated alumina.

Embodiment 3

[0017] Take 500mL of 5mol / L nitric acid solution in a four-necked round bottom flask placed in a water bath (the middle port is placed for stirring, and the other three ports are respectively placed with a pH meter, condenser tube and rubber stopper), and when the nitric acid solution reaches 30°C, start Stirring 1000rpm, sodium aluminate solution (Na 2 O 130g / L, α k 1.50) was slowly added until the pH value of the mixed solution reached 5. 10g / L pore-enlarging agent polyethylene glycol was added under the condition of keeping its pH, temperature and stirring speed constant, and solid-liquid separation was carried out after aging for 2 hours. / L) of nitric acid and 4wt% stabilizer erbium oxide are mixed evenly, then placed in a vacuum oven at 90°C for 2h, then put into a muffle furnace and roasted at 600°C for 4h to obtain high temperature resistant activated alumina.

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Abstract

The invention relates to a method for preparing fireresistant activated alumina. A liquid phase counter-titration precipitation method is adopted; a sodium aluminate solution and a nitric acid solution are used as raw material; organisms are used as a pore expanding agent; a rare earth oxide is used as a stabilizing agent; the alumina with large specific surface area and good fireresistant performance is prepared by adopting the liquid phase counter-titration precipitation method. The rare earth oxide content in the alumina is between 0.1 and 10 wt percent; an alumina solid is treated for 5 hours in the atmosphere of 700 DEG C; the specific surface area of the alumina solid is more than 350m <2> / g; the average pore volume is 0.3122 mL / g; the average aperture is 5.23 nm; and the aperture distribution range is between 3 and 12 nm. The alumina solid is treated for 5 hours in the atmosphere of 1100 DEG C; and the specific surface area of the alumina solid is more than 150 m <2> / g. The method has the characteristics of low production cost, simple process, large specific surface area, even aperture distribution and good high-temperature thermal stability.

Description

technical field [0001] The invention relates to the field of alumina preparation, in particular to a preparation method of high-temperature resistant activated alumina. Background technique [0002] With the advancement of science and technology and the rapid development of social economy, as an important means of transportation, the automobile industry has developed rapidly. At present, the number of cars in the world has exceeded 600 million, and is increasing at a rate of 50 million per year. By 2010, the number of cars in the world will increase to 1 billion. my country's automobile industry is also developing rapidly. The current social ownership is more than 14 million vehicles. According to experts' prediction, in the next 10 to 15 years, China's automobile ownership will grow at an average annual rate of 9%. Cars mainly use fuel as the main power, and the gas released contains a variety of harmful gases, and its main components include carbon monoxide, hydrocarbons ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01F7/14
Inventor 吴玉胜李明春邵义韩亚苓
Owner SHENYANG POLYTECHNIC UNIV
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