Process for preparing mesopore pitch-based spherical activated carbon by post-carbonizing impregnated metal salts

A technology of spherical activated carbon and secondary carbonization, which is applied in the field of mesoporous pitch-based spherical activated carbon prepared by impregnated metal salt secondary carbonization, which can solve the problems of high loss-on-ignition rate of pitch-based spherical activated carbon, such as reduced mechanical strength and limited use, and achieves low ash content content, low metal impurity content, and high mechanical strength

Inactive Publication Date: 2008-10-15
EAST CHINA UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At the same time, the high loss-on-ignition rate of carbon also leads to the reduction of mechanical strength of pitch-based spherical activated carbon, which also limits its use in fixed beds to some extent.

Method used

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  • Process for preparing mesopore pitch-based spherical activated carbon by post-carbonizing impregnated metal salts
  • Process for preparing mesopore pitch-based spherical activated carbon by post-carbonizing impregnated metal salts

Examples

Experimental program
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Effect test

Embodiment 1

[0016] The selected specific surface area is 1000m 2 / g of pitch-based spherical activated carbon, with copper sulfate as inorganic metal salt, by mixing and impregnating with pitch-based spherical activated carbon by a mass ratio of 0.05 for 10 hours (wherein the mass concentration of the metal salt solution used is 1%), after the impregnation ends , the sample was dried in an oven at 110°C until there was no obvious liquid flow, then the impregnated sample was carbonized at 800°C for 1 hour, cooled to below 50°C, and the residual metal impurities were removed with 0.5mol / L HCl solution, that is, Pitch-based spherical activated carbon with high mesopore content.

Embodiment 2

[0018] The selected specific surface area is 1200m 2 / g of pitch-based spherical activated carbon, with ferric nitrate as inorganic metal salt, by mixing and impregnating with pitch-based spherical activated carbon by a mass ratio of 0.04 for 5 hours (wherein the mass concentration of the metal salt solution used is 2%), after the impregnation ends , the sample was dried in an oven at 100°C until there was no obvious liquid flow, then the impregnated sample was carbonized at 1000°C for 0 hour, cooled to below 50°C, and the residual metal impurities were removed with 0.5mol / L HCl solution, that is, Pitch-based spherical activated carbon with high mesopore content. .

Embodiment 3

[0020] The selected specific surface area is 800m 2 / g of pitch-based spherical activated carbon, with ferric sulfate as inorganic metal salt, mixed with pitch-based spherical activated carbon in a mass ratio of 0.03 and impregnated for 15 hours (wherein the mass concentration of the metal salt solution used is 0.3%), after the impregnation ends , the sample was dried in an oven at 120 °C until there was no obvious liquid flow, then the impregnated sample was carbonized at 1100 °C for 5 hours, cooled to below 50 °C, and the residual metal impurities were removed with 1 mol / L HCl solution to obtain Pitch-based spherical activated carbon with high mesopore content. The pore size distribution in the mesopore range calculated by the BJH model with the raw material sample is shown in Figure 1.

[0021] Table 1 The pore structure parameters of the raw material pitch-based spherical activated carbon used in each example and the pitch-based spherical activated carbon after secondary ...

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Abstract

The invention provides a method for preparing mesoporous asphaltic base globular active carbon by dipping metal salt and secondary carbonization. The method comprises the steps of dipping and mixing the mipor asphaltic base globular active carbon prepared by the traditional method with an inorganic metal salt solution by a certain ration; heating under an inert atmosphere to 600-1200 DEG C at a temperature increasing rate of 1 to 20 DEG C/min for the secondary carbonization; using acid to wash off the remaining metal inside the carbonized material, so as to obtain asphaltic base globular active carbon with high mesoporous rate and narrow distribution of mesoporous spertures.

Description

technical field [0001] The invention relates to a method for preparing pitch-based spherical activated carbon, in particular to a method for preparing mesoporous pitch-based spherical activated carbon by impregnating metal salts for secondary carbonization. Background technique [0002] The traditional method of preparing pitch-based spherical activated carbon is to use high-softening-point pitch raw materials, and then undergo pelletizing, non-melting, carbonization, and activation treatments. Due to the limitations of the nature of the pitch itself and the activation method, the prepared pitch-based spherical activated carbon is mainly microporous, and its pore size distribution is mainly in the pore size range of less than 2nm. However, in actual use, the existence of 2-50nm mesopores can not only provide channels for the adsorption of small molecules and increase the adsorption rate, but also provide an adsorption site for the adsorption of larger molecules and increase ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B31/08
Inventor 梁晓怿刘小军刘朝军王琴陈庆军詹亮张睿乔文明凌立成
Owner EAST CHINA UNIV OF SCI & TECH
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