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Molten salt coating chemical activation method for preparing activated carbon with high specific surface area

A technology with high specific surface area and chemical activation, which is applied in the field of preparing activated carbon with high specific surface area by using the method of "molten salt coating chemical activation", which can solve the problems of complex process and expensive equipment, and achieve simple operation, low cost and excellent rate performance Effect

Pending Publication Date: 2021-12-31
HAINAN UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Aiming at the problems of complex process, expensive equipment (such as atmosphere furnace) and inert protective atmosphere in the conventional activated carbon preparation process, the present invention provides a molten salt coating chemical activation method for preparing activated carbon with high specific surface area

Method used

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  • Molten salt coating chemical activation method for preparing activated carbon with high specific surface area
  • Molten salt coating chemical activation method for preparing activated carbon with high specific surface area
  • Molten salt coating chemical activation method for preparing activated carbon with high specific surface area

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Embodiment 1

[0032] The present embodiment provides a kind of method for preparing PCC-700 gac, described method comprises the steps:

[0033] Step 1: Weigh petroleum coke and KOH according to the mass ratio of 1:3 and mix them;

[0034] Step 2: Coating the mixture of step 1 with KCl, coating a layer of KCl on the outside of the mixture, and placing it in a crucible with a cover;

[0035] Step 3: Place the covered crucible in Step 2 in a muffle furnace (air atmosphere) at 5°C min -1 The heating rate is kept at 700°C for 2h;

[0036] Step 4: The product activated in Step 3 was acid-washed with 5vol% HCl for 6 hours;

[0037] Step 5: Wash the product after pickling in step 4 with deionized water for 6 hours;

[0038] Step 6: Suction filter the product washed with water in Step 6, and then place it in a constant temperature drying oven at 70°C for 12 hours to obtain the prepared PCC-700 activated carbon.

Embodiment 2

[0040] The present embodiment provides a kind of method for preparing PCC-750 gac, described method comprises the steps:

[0041] Step 1: Weigh petroleum coke and KOH according to the mass ratio of 1:3 and mix them;

[0042] Step 2: Coating the mixture of step 1 with KCl, coating a layer of KCl on the outside of the mixture, and placing it in a crucible with a cover;

[0043] Step 3: Place the covered crucible in Step 2 in a muffle furnace (air atmosphere) at 5°C min -1 The heating rate is kept at 750°C for 2h;

[0044] Step 4: The product activated in Step 3 was acid-washed with 5vol% HCl for 6 hours;

[0045] Step 5: Wash the product after pickling in step 4 with deionized water for 6 hours;

[0046] Step 6: Suction filter the product washed with water in Step 6, and then place it in a constant temperature drying oven at 70°C for 12 hours to obtain the prepared PCC-750 activated carbon.

Embodiment 3

[0048] The present embodiment provides a kind of method for preparing PCC-800 gac, described method comprises the steps:

[0049] Step 1: Weigh petroleum coke and KOH according to the mass ratio of 1:3 and mix them;

[0050] Step 2: Coating the mixture of step 1 with KCl, coating a layer of KCl on the outside of the mixture, and placing it in a crucible with a cover;

[0051] Step 3: Place the covered crucible in Step 2 in a muffle furnace (air atmosphere) at 5°C min -1 The heating rate is kept at 800°C for 2h;

[0052] Step 4: The product activated in Step 3 was acid-washed with 5vol% HCl for 6 hours;

[0053] Step 5: Wash the product after pickling in step 4 with deionized water for 6 hours;

[0054] Step 6: Suction filter the product washed with water in Step 6, and then place it in a constant temperature drying oven at 70°C for 12 hours to obtain the prepared PCC-800 activated carbon.

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Abstract

The invention discloses a molten salt coating chemical activation method for preparing activated carbon with a high specific surface area. The method comprises the following steps: step 1, weighing petroleum coke and KOH, and mixing; step 2, coating the mixture with KCl, and placing the mixture in a crucible with a cover; step 3, placing the crucible with the cover in a muffle furnace, and performing heat preservation for 1-3 h at the temperature of 750-900 DEG C at the heating rate of 5 DEG C min <-1 >; step 4, stirring and pickling the activated product with HCl; step 5, stirring and washing the acid-washed product with deionized water; and step 6, carrying out suction filtration on the product washed in the step 6, and drying the product in a constant-temperature drying box to obtain the prepared activated carbon. The method is easy to operate, does not need expensive heating equipment and extra inert protective atmosphere, is low in cost, prepares the micropore-mesopore activated carbon with high specific surface area, large pore volume and stepped pore diameter distribution, and can realize large-scale popularization.

Description

technical field [0001] The invention relates to a method for preparing activated carbon, in particular to a method for preparing activated carbon with a high specific surface area by using the "molten salt coating chemical activation" method. Background technique [0002] Activated carbon is a porous carbon material prepared from carbon-containing raw materials such as biomass, coal, petroleum coke, and some synthetic polymers through pyrolysis, activation, and other heat treatments. Activated carbon has a rich pore structure, which makes it have a high specific surface area (500-2000m 2 g -1 ) and excellent adsorption properties. Generally, the adsorption performance of activated carbon mainly depends on its properties in two aspects, one is its specific surface area, and the other is the matching between its pore structure and the size of the adsorbate, that is, different types of adsorbates require activated carbon with different pore sizes. Correspondingly, if the por...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B32/348C01B32/33H01G11/34H01G11/44H01G11/24
CPCC01B32/348C01B32/33H01G11/34H01G11/44H01G11/24Y02E60/13
Inventor 陈永罗先游彭浩南吴金鹏袁平
Owner HAINAN UNIVERSITY
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