Preparation method of doped high-specific-surface-area activated carbon

A high specific surface area, activated carbon technology, used in the field of chemical production, can solve the problems of product ignition loss, easy oxidation of potassium element, and safety hazards.

Active Publication Date: 2014-11-19
DALIAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

But elemental potassium is very active. If the activated product comes into direct contact with the air, elemental potassium is easily oxidized, and even a combustion reaction occurs, resulting in burning of the product, which poses a serious safety hazard.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Take 2g of KOH, add 2ml of deionized water to dissolve, then mix with 1g of petroleum coke crushed to a particle size of less than 150μm, put it in an oven, and dry at 110°C for 3h. Put the dried alkali-carbon mixture into a stainless steel reaction boat, and then put it into a horizontal tube reactor, under N 2 Under atmosphere protection (N 2 The gas velocity is 140ml / min), the heating rate is raised to 780°C at a rate of 8°C / min for activation, and the activation time is 1h. After the above activation process is completed, the furnace temperature is naturally cooled to 200 ° C in a nitrogen atmosphere, and the N 2 switch to water vapor and N 2 The mixed gas (N 2 + The total gas velocity of water vapor is 140mL / min, and the water vapor volume fraction is 43%). After 0.5 h of feed time, H was no longer detected in the exhaust gas 2 , to remove the activated product. First wash with 40ml of hydrochloric acid with a concentration of 1mol / L, then repeatedly wash wit...

Embodiment 2

[0025] Change the composition of the carrier gas so that the carrier gas is a mixed atmosphere of nitrogen and hydrogen (N 2 +H 2 Total gas velocity 140mL / min, H 2 Volume fraction is 30%), other conditions are with embodiment 1. The specific surface area of ​​the activated carbon product is 2475m 2 / g, its total pore volume is 0.90cm 3 / g, the micropore volume is 1.08cm 3 / g.

Embodiment 3

[0027] After the activation process, the furnace temperature was naturally cooled to 400 °C in a nitrogen atmosphere, and the N 2 switch to heated ammonia and N 2 The mixed atmosphere (N 2 +NH 3 Total gas velocity 140mL / min, NH 3 Volume fraction is 43%), and the passage time is 0.5h, and other conditions are with embodiment 1. The specific surface area of ​​the activated carbon product is 2075m2 / g, the total pore volume is 1.12cm 3 / g, the micropore volume is 0.82cm 3 / g, the nitrogen content of activated carbon reached 0.64% after the introduction of ammonia gas, which was 0.37% higher than the 0.27% when ammonia gas was not introduced.

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Abstract

The invention provides a preparation method of doped high-specific-surface-area activated carbon, belonging to the technical field of chemical industry production. The method comprises the following steps: mixing a pulverized carbonous raw material with KOH to obtain an alkali carbon mixture; heating to 700-850 DEG C at the rate of 2-15 DEG C / minute in an inert gas or mixed gas atmosphere under normal pressure, and activating for 0.5-4 hours; cooling the activating furnace to 25-40 DEG C, and introducing a de-intercalation reagent and metal potassium in the activation product to react until all the metal potassium reacts; cooling the activating furnace to room temperature, and taking out the solid material; and washing the solid material with hydrochloric acid, washing with deionized water until the pH value of the filtrate is 6-7, and drying to obtain the doped high-specific-surface-area activated carbon. By introducing the de-intercalation reagent, the specific heteroatoms or heteroatom groups are introduced into the activated carbon, thereby implementing safe conversion of metal potassium and obtaining the doped high-specific-surface-area activated carbon with specific pore structure and surface properties.

Description

technical field [0001] The invention belongs to the technical field of chemical production, and relates to a preparation method of activated carbon doped with high specific surface area. Background technique [0002] Activated carbon with high specific surface area prepared by KOH activation method shows superior performance in gas storage, energy storage, adsorption separation, catalyst carrier and other applications due to its unique surface and pore structure, and has broad application prospects. In order to meet the application requirements of activated carbon in different fields, it is usually necessary to do doping modification, that is, to introduce heteroatoms or heteroatom groups into activated carbon to modify its surface properties and pore structure, so as to meet the use requirements and become a research hotspot. . [0003] The existing methods for preparing doped porous carbon materials can be roughly divided into two categories. The first type of method is ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B31/12
Inventor 徐绍平梁佳张微王会涛王克超
Owner DALIAN UNIV OF TECH
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