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Thermally treated active carbon and preparation method thereof

A technology of activated carbon and high temperature treatment, applied in the field of materials science, can solve the problems of reducing the specific surface area and pore volume of activated carbon, destroying the pore distribution of the carrier, unfavorable dispersion of active metals and additives, and achieving low carbon loss on ignition and large porosity. high effect

Inactive Publication Date: 2012-05-09
FUZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, high-temperature heat treatment will greatly reduce the specific surface area and pore volume of activated carbon, and destroy the pore distribution of the carrier, which is not conducive to the dispersion of active metals and additives.

Method used

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  • Thermally treated active carbon and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] Take 4g of commercial activated carbon and place it in argon at 1850°C for 1 hour, crush it to 12-16 mesh, impregnate it in KOH solution until the mass ratio of KOH:C is 0.5:1, and dry it at 120°C for 4 hours. Place the sample in a tube furnace, expand the pores at 700°C for 2 hours in 200 mL / min of nitrogen, cool to room temperature in the above atmosphere, and wash 5 times with 20 mL of dilute hydrochloric acid (0.01 moL / L) , and then washed with distilled water until the washing solution is neutral and free of acidic ions, and then dried in an oven at 120 for 12 hours.

Embodiment 2

[0016] Example 1 was repeated, except that the time of the hole enlargement treatment was extended from 2 hours to 20 hours.

Embodiment 3

[0018] Repeat Example 1, just change KOH to KOH and K 2 CO 3 Mixture (KOH and K 2 CO 3 The mass ratio is 1:1).

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Abstract

The invention discloses a thermally treated active carbon and a preparation method thereof. The preparation method comprises the steps of: uniformly mixing active carbon which is subjected to a high temperature treatment with a pore-enlarging agent; and performing a pore-enlarging treatment at 300-1000 DEG C for 0.1-48 hours to obtain thermally treated active carbon with high mesopore and macropore rates. The active carbon obtained by the preparation method disclosed by the invention has the advantages of low carbon loss rate on ignition in the treatment process, low ratio of pore volume of micropores to total pore volume as well as high mesopore and macropore rates, and can be used as a carrier of catalysts.

Description

technical field [0001] The invention relates to heat-treated activated carbon with high mesopore and macroporosity and a preparation method thereof, belonging to the field of material science. Background technique [0002] Activated carbon is widely used as a catalyst carrier. Ordinary activated carbon has developed micropores and a high specific surface area, but has the disadvantage of a small number of mesopores. At the same time, if the specific surface area of ​​the carbon carrier is too high or the number of micropores is too large, the supported active metal particles will be too small, which will not be conducive to the progress of some catalytic reactions and reduce the utilization rate of the active metal. As reported in many literatures, in the ammonia synthesis reaction, increasing the mesoporosity and macroporosity of the activated carbon support will help to improve the ammonia synthesis activity of the ruthenium catalyst. In addition, in some reaction systems...

Claims

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Application Information

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IPC IPC(8): C01B31/08B01J32/00B01J21/18C01B32/354
Inventor 林炳裕魏可镁王榕林建新倪军
Owner FUZHOU UNIV
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