Active carbon and method for preparation of the same

Patent metadata

Field	Value
Publication number	US-9682865-B2
Application number	US-201514666518-A
Country	US
Kind code	B2
Filing date	Mar 24, 2015
Priority date	Oct 27, 2014
Publication date	Jun 20, 2017
Grant date	Jun 20, 2017

Abstract

Disclosed is an active carbon that includes micropores having a diameter of about 0.5 nm to about 0.8 nm in a content of about 70 vol % to about 90 vol % based on the total volume of the total pores, and has a nitrogen-containing functional group introduced on the surface thereof.
Moreover, disclosed is a method for preparing active carbon. The method may include steps of: forming a reaction mixture including a carbon precursor, an alkali salt, and an organic compound including a nitrogen-containing functional group; and heating the reaction mixture to a temperature of about 800° C. to about 1000° C. in the presence of nitrogen gas.

First claim

What is claimed:

1. An active carbon, comprising:
micropores having a diameter of about 0.5 nm to about 0.8 nm in a content of about 70 vol % to about 90 vol % based on the total volume of total pores,
wherein the nitrogen-containing functional group includes at least one selected from the group consisting of a C1-C20 alkyl group substituted with at least one amino group, a C2-C20 cycloalkyl group substituted with at least one amino group, and a C6-C20 aryl group substituted with at least one amino group,
wherein the active carbon has a nitrogen-containing functional group introduced on the surface thereof.

2. The active carbon according to claim 1 ,
wherein a volume of the total pores is from about 2.000 cm 3 /g to about 2.500 cm 3 /g.

3. The active carbon according to claim 1 ,
wherein the active carbon has a diameter of about 0.01 μm to about 0.9 μm.

4. The active carbon according to claim 3 ,
wherein the active carbon having a diameter of about 0.1 μm to about 0.5 μm is included in a content of 70 number % to 90 number % of the total number of the active carbon having a diameter of about 0.01 μm to about 0.9 μm.

5. The active carbon according to claim 1 ,
wherein the active carbon has a specific surface area of about 3000 m 2 /g to about 4000 m 2 /g.

6. The active carbon according to claim 1 ,
wherein the active carbon has a mean carbon dioxide adsorption amount of about 20 mg/g to about 300 mg/g.

7. The active carbon according to claim 1 ,
wherein the introduction of the nitrogen-containing functional group on the surface of the active carbon is mediated by at least one functional group selected from the group consisting of a functional group of the following Chemical Formula 1, an ether functional group, and a thioether functional group:

wherein, in Chemical Formula 1,
R 1 and R 3 are identical or different, and are independently hydrogen or a linear or branched C 1-10 alkyl group; and
R 2 and R 4 are identical or different, and are independently a bond or a linear or branched C 1-10 alkylene group.

8. The active carbon according to claim 1 ,
wherein the content of the nitrogen in the nitrogen-containing functional group is of about 3 wt % to about 10 wt %, based on the total weight of the active carbon.

9. A method for preparing active carbon, comprising steps of:
forming a reaction mixture comprising a carbon precursor, an alkali salt, and an organic compound including a nitrogen-containing functional group; and
heating the reaction mixture to a temperature of about 800° C. to about 1000° C. in the presence of nitrogen gas.

10. The method according to claim 9 ,
wherein a weight ratio of the alkali salt and the organic compound including a nitrogen-containing functional group is from about 1:1.5 to about 1:5.

11. The method according to claim 9 ,
wherein a weight ratio of the carbon precursor and the alkali salt is from about 1:1.5 to about 1:2.5.

12. The method according to claim 9 ,
wherein a weight ratio of the carbon precursor and the organic compound including a nitrogen-containing functional group is from about 1:2 to about 1:10.

13. The method according to claim 9 ,
wherein the step of forming a reaction mixture is performed at an ambient temperature and an ambient pressure.

14. The method according to claim 9 ,
wherein the carbon precursor includes at least one selected from the group consisting of rice husks, coconut shells, tangerine peels, orange peels, exhausted coffee, and bamboo stems.

15. The method according to claim 9 ,
wherein the alkali salt includes at least one selected from the group consisting of potassium hydroxide, sodium hydroxide, and calcium hydroxide.

16. The method according to claim 9 , further comprising,
a step of pulverizing the carbon precursor before the step of forming the reaction mixture.

17. The method according to claim 9 ,
wherein the step of heating the reaction mixture is performed for about 30 minutes to about 100 minutes.

18. An apparatus that comprises an active carbon of claim 1 .

19. A resin molded product that comprises an active carbon of claim 1 .

Assignees

• Hyundai Motor Co Ltd
• Kia Motors Corp
• Inha—Industry Partnership Inst
• Inha-Industry Partnership Inst

Inventors

• Bae Shin-Tae
• Lee Seul-Yi
• Heo Young-Jung
• Park Soo-Jin

Classifications

• C01P2004/61

  Micrometer sized, i.e. from 1-100 micrometer · CPC title

• B01J20/28004

  Sorbent size or size distribution, e.g. particle size · CPC title

• B01J20/2808

  being less than 2 nm, i.e. micropores or nanopores · CPC title

• C01B32/324 Primary

  from waste materials, e.g. tyres or spent sulfite pulp liquor · CPC title

• C01P2006/14

  Pore volume · CPC title