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Preparation method for activated alumina oxide with large pore volume and high specific surface area

A technology of activated alumina and high specific surface area, which is used in alumina/hydroxide preparation, chemical instruments and methods, catalyst supports, etc., which can solve the complex process and the difficulty of activated alumina to exert both large pore volume and high specific surface area at the same time. , the problem of high production cost, to achieve the effect of simple process, large pore size and low cost of raw materials

Active Publication Date: 2015-03-11
山西炬华新材料科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The above-mentioned method for preparing activated alumina has high production cost and complex process, and it is difficult for the prepared activated alumina to simultaneously exert the characteristics of large pore volume and high specific surface area.

Method used

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  • Preparation method for activated alumina oxide with large pore volume and high specific surface area

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] Embodiment 1; Get 100ml, the nitric acid solution of 1mol / L is placed in the beaker, setting water-bath reaction temperature is 30 ℃ and carries out magnetic stirring, sodium aluminate solution (αk=1.45) is slowly dripped in the above solution, until The pH of the solution reached 10. Set the aging temperature to 60°C and carry out vigorous stirring aging, and the aging time is 2h. After aging, vacuum suction filtration was used for solid-liquid separation and ultrasonic washing several times, and the obtained filter cake was transferred to a distillation flask, and n-butanol was added at a ratio of solid-liquid volume ratio = 1:5 for co-distillation. The obtained activated alumina precursor was put into a muffle furnace and roasted at 500°C for 4 hours to obtain activated alumina with large pore volume and high specific surface area.

Embodiment 2

[0015] Embodiment 2: Get 100ml, the nitric acid solution of 1mol / L is placed in the beaker, setting water-bath reaction temperature is 30 ℃ and carries out magnetic stirring, sodium aluminate solution (αk=1.40) is slowly dripped in the above solution, until The pH of the solution reached 9. Set the aging temperature to 70°C and carry out vigorous stirring aging, and the aging time is 4h. After aging, vacuum suction filtration was used for solid-liquid separation and ultrasonic washing several times. The obtained filter cake was transferred to a distillation flask, and n-butanol was added at a ratio of solid-liquid volume ratio = 1:4 for co-distillation. The obtained activated alumina precursor was put into a muffle furnace and roasted at 500°C for 4 hours to obtain activated alumina with large pore volume and high specific surface area.

Embodiment 3

[0016] Embodiment 3; Get 100ml, the nitric acid solution of 2mol / L is placed in the beaker, setting water bath reaction temperature is 20 ℃ and carries out magnetic stirring, sodium aluminate solution (αk=1.35) is slowly dripped in the above solution, until The pH of the solution reached 9. Set the aging temperature to 80°C and carry out vigorous stirring aging, and the aging time is 5h. After aging, vacuum suction filtration was used for solid-liquid separation and ultrasonic washing several times, and the obtained filter cake was transferred to a distillation flask, and n-butanol was added at a ratio of solid-liquid volume ratio = 1:5 for co-distillation. The obtained activated alumina precursor was put into a muffle furnace and roasted at 500°C for 4 hours to obtain activated alumina with large pore volume and high specific surface area.

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Abstract

The invention especially relates to a preparation method for activated alumina with a large pore volume and a high specific surface area, which belongs to the field of preparation of modified alumina. The method comprises the following steps: (1) preparing a nitric acid solution with a concentration of 1 to 3 mol / L, slowly adding a sodium aluminate solution into the nitric acid solution and carrying out stirring so as to obtain sol, wherein, reaction temperature is in a range of 20 to 50 DEG C and the pH value of the nitric acid solution is in a range of 6 to 10; (2) adjusting ageing temperature to be 50 to 90 DEG C and controlling ageing time to be 2 to 10 h; (3) carrying out vacuum suction filtration and washing on the aged sol; (4) mixing a product obtained in step (3) with n-butanol and carrying out co-distillation on an obtained mixture according to a solid-liquid volume ratio of 1:3-8 so as to obtain dry precursor; and (5) roasting the precursor so as to obtain a target product. According to the invention, the preparation method is simple, n-butanol can be cyclically used, the target product has a high specific surface area, a large bore diameter and a large pore volume, and industrial production of the target product is convenient.

Description

Technical field [0001] The present invention is the preparation field of alumina alumina, which specially involves a preparation method for large -pore capacity high ratio surface -area active aluminum aluminum. Background technique [0002] With the continuous increase of car ownership and demand, automobile exhaust gas pollution has become a major source of atmospheric pollution in large and medium -sized cities.The pollutants in the tail gas emissions are mainly: hydrocarbons (HC), carbon oxides (CO and CO 2 ), Nitrogen oxide (NO x To.At present, only cars in global motor vehicles emit CO 2 billion tons of CO in the atmosphere each year, HC 400 million tons, NO x 200 million tons.As a result, the treatment of automobile exhaust has also become an important issue.Automotive exhaust catalyst classified the aerobic catalyst and triple -effect catalyst (that is, can be converted at the same time to convert CO, HC and NO at the same time x Catalyst).Among them, the three -e...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01F7/30B82Y40/00B01J32/00B01J35/10B01J21/04
Inventor 胡方吴玉胜马姣
Owner 山西炬华新材料科技有限公司