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Alumina foil coated activated carbon and preparation method thereof

A technology of alumina film and activated carbon, which is applied in chemical instruments and methods, catalyst carriers, and other chemical processes, can solve the problems of reduced catalyst activity, decreased porosity, and affecting the mechanical strength of catalysts, and achieves simple preparation processes and improved mechanical properties. intensity effect

Inactive Publication Date: 2012-02-22
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Shaping affects not only the mechanical strength of the catalyst, but also its catalytic activity, specific surface area, and pore distribution
For example, for molded (tabletting) catalysts, increasing the molding pressure will lead to a decrease in porosity, and the most likely pore size will become smaller; on the other hand, excessive molding pressure may reduce the defects on the catalyst grain surface (such as vacancies , dislocations and grain boundaries), which reduces the activity of the catalyst

Method used

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  • Alumina foil coated activated carbon and preparation method thereof
  • Alumina foil coated activated carbon and preparation method thereof
  • Alumina foil coated activated carbon and preparation method thereof

Examples

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Effect test

Embodiment 1

[0018] 1) Aluminum isopropoxide was hydrolyzed at 80°C for 1 hour, nitric acid was added, refluxed at 90°C for 12 hours, and then kept at 90°C in air for 2 hours to obtain a stable alumina sol. Wherein, the mol ratio of aluminum isopropoxide and water is 1: 100, and the mol ratio of aluminum isopropoxide and nitric acid is 1: 0.07;

[0019] 2) Mix granular woody activated carbon with alumina sol, soak the slurry for 3 times, then dry at 40°C for 24 hours, heat up to 400°C at a rate of 40°C / h and roast for 4 hours, and then reduce to 40°C at a rate of 40°C / h At room temperature, alumina film-coated granular wood activated carbon was obtained (see figure 1 ), the thickness of the aluminum oxide film is 10nm.

[0020] The wood activated carbon particles (AC2) coated with aluminum oxide film prepared in this example, compared with the wood activated carbon particles (AC1) before coating, the wear rate (measured according to GBT 12496 [1]. 22-1990 standard) has decreased by 74% ,...

Embodiment 2

[0026] 1) Aluminum isopropoxide was hydrolyzed at 80°C for 1 hour, nitric acid was added, refluxed at 90°C for 12 hours, and then kept at 90°C in air for 2 hours to obtain a stable alumina sol. Wherein, the mol ratio of aluminum isopropoxide and water is 1: 100, and the mol ratio of aluminum isopropoxide and nitric acid is 1: 0.07;

[0027] 2) Mix granular woody activated carbon with alumina sol, dip into slurry 5 times, dry at 40°C for 24 hours, heat up to 400°C at a rate of 40°C / h and roast for 4 hours, then lower to room temperature at a rate of 40°C / h , to obtain granular wood activated carbon coated with alumina film (see figure 2 ), the thickness of the aluminum oxide film is 25nm.

[0028] The wood activated carbon particles (AC3) coated with aluminum oxide film prepared in this example, compared with the wood activated carbon particles (AC1) before coating, the wear rate (measured according to GBT 12496 [1]. 22-1990 standard) has decreased by 77% , it can be seen th...

Embodiment 3

[0033] 1) Aluminum isopropoxide was hydrolyzed at 70°C for 1 hour, nitric acid was added, refluxed at 100°C for 12 hours, and then kept at 100°C in air for 2 hours to obtain a stable alumina sol. Wherein, the mol ratio of aluminum isopropoxide and water is 1: 150, and the mol ratio of aluminum isopropoxide and nitric acid is 1: 0.03;

[0034] 2) Mix granular coal-based activated carbon with alumina sol, dip into slurry 7 times, dry at 40°C for 24 hours, heat up to 400°C at a rate of 40°C / h and roast for 4 hours, and then reduce to At normal temperature, the granular coal-based activated carbon coated with alumina film (see image 3 ), the thickness of the aluminum oxide film is 40nm.

[0035] The coal-based activated carbon particles (AC5) coated with aluminum oxide film prepared in this example, compared with the coal-based activated carbon particles (AC4) before coating, the wear rate (measured according to GBT 12496 [1]. 22-1990 standard) is reduced 81%, it can be seen th...

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Abstract

The invention provides alumina membrane coated activated carbon and a preparation method thereof. The alumina membrane with the thickness of between 10 and 50nm is coated on the surface of the activated carbon. The preparation method comprises the following steps of: 1) hydrolyzing aluminum isopropoxide, adding nitric acid, refluxing at the temperature of between 90 and 100 DEG C, and preserving temperature to obtain an alumina sol; 2) soaking the activated carbon in the alumina sol for dipping, mixing, drying, heating the mixture to 400 DEG C in a velocity of 40 DEG C / h for calcining, and cooling the mixture to normal temperature in the velocity of 40 DEG C / h. The preparation method has simple process, and the prepared alumina membrane coated activated carbon has the advantages of not influencing the property of the porous structure of the activated carbon and greatly improving the mechanical strength of the activated carbon.

Description

technical field [0001] The invention relates to an activated carbon coated with an inorganic film and a preparation method thereof. In particular, activated carbon coated with alumina film and its preparation method. Background technique [0002] Activated carbon has the advantages of large specific surface, developed pore structure, stable chemical properties, and acid and alkali resistance. It has been used as an adsorbent for a long time. In addition, due to the above characteristics, activated carbon can also be used as a carrier for solid catalysts. During the catalytic reaction, the mechanical strength (mainly wear resistance) of the activated carbon support is very important to it. Abrasion will cause the catalyst to run away in the reactor with moving bed, fluidized bed and other configurations, and the fine powder produced by the abrasion will pollute the downstream. In extreme cases, it will affect the distribution of the catalyst in the reactor. Production canno...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J20/20B01J20/32B01J32/00
Inventor 陈丰秋侯春阳程党国詹晓力
Owner ZHEJIANG UNIV
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