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

A high specific surface area, activated alumina technology, applied in the direction of alumina/hydroxide preparation, chemical instruments and methods, catalyst supports, etc., can solve the complex process and the difficulty of activated alumina to simultaneously exert large pore volume and high specific surface area , high production costs, etc., to achieve the effect of simple process, large pore size and low cost of raw materials

Active Publication Date: 2012-06-27
山西炬华新材料科技有限公司
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  • Application Information

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Problems solved by technology

The above-mentioned method for preparing activated alumina has high production cost and complex process, and it is difficult for

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

Examples

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Example Embodiment

[0014] Example 1: Take 100ml of 1mol / L nitric acid solution and place it in a beaker, set the water bath reaction temperature to 30°C and perform magnetic stirring, slowly drip the sodium aluminate solution (αk=1.45) into the above solution until The pH of the solution reaches 10. Set the aging temperature to 60°C and perform vigorous stirring for aging, and the aging time is 2h. After aging, vacuum filtration was used to separate solid-liquid and ultrasonically washed several times. The obtained filter cake was transferred to a distillation flask, and n-butanol was added in a ratio of solid-liquid volume ratio = 1:5 for co-distillation. The obtained activated alumina precursor was put into a muffle furnace and calcined at 500°C for 4 hours to obtain activated alumina with large pore volume and high specific surface area.

Example Embodiment

[0015] Example 2: Take 100ml, 1mol / L nitric acid solution and place it in a beaker, set the water bath reaction temperature to 30°C and perform magnetic stirring, slowly drip the sodium aluminate solution (αk=1.40) into the above solution until The pH of the solution reaches 9. Set the aging temperature to 70°C and perform vigorous agitation for aging. The aging time is 4h. After aging, vacuum filtration was used to separate solid-liquid and ultrasonically washed several times. The obtained filter cake was transferred to a distillation flask, and n-butanol was added in a ratio of solid-liquid volume ratio=1:4 for co-distillation. The obtained activated alumina precursor was put into a muffle furnace and calcined at 500°C for 4 hours to obtain activated alumina with large pore volume and high specific surface area.

Example Embodiment

[0016] Example 3; Take 100ml of 2mol / L nitric acid solution and place it in a beaker, set the water bath reaction temperature to 20°C and perform magnetic stirring, slowly drip the sodium aluminate solution (αk=1.35) into the above solution until The pH of the solution reached 9. Set the aging temperature to 80°C and perform vigorous agitation for aging. The aging time is 5h. After aging, vacuum 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 in a ratio of solid-liquid volume ratio = 1:5 for co-distillation. The obtained activated alumina precursor was put into a muffle furnace and calcined 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 invention belongs to the field of preparation of modified alumina, in particular to a preparation method of activated alumina with large pore volume and high specific surface area. Background technique [0002] With the continuous increase of automobile ownership and demand, automobile exhaust pollution has become the main source of air pollution in large and medium-sized cities. The pollutants in the tail gas emitted by automobiles mainly include: hydrocarbons (HC), carbon oxides (CO and CO 2 ), nitrogen oxides (NO x ). At present, automobiles alone emit 2 billion tons of CO, 400 million tons of HC, and NO x 200 million tons. Therefore, the treatment of automobile exhaust has increasingly become an important issue. Automobile exhaust catalysts are classified into oxidation catalysts and three-way catalysts according to their reaction functions (that is, they can convert CO, HC and NO at the same time) x catalyst). Among ...

Claims

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Application Information

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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
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