Activated carbon and method for manufacturing the same

Patent metadata

Field	Value
Publication number	US-10328381-B2
Application number	US-201615246943-A
Country	US
Kind code	B2
Filing date	Aug 25, 2016
Priority date	Feb 25, 2016
Publication date	Jun 25, 2019
Grant date	Jun 25, 2019

Abstract

Disclosed is an activated carbon including pores formed on a surface thereof, in particular, the pores include ultra-micropores having a diameter that is equal to or less than about 1.0 nm.

First claim

What is claimed is:

1. A method of manufacturing an activated carbon, the method comprising:
preparing a carbon precursor;
carbonizing the carbon precursor by heat treating thereon;
equalizing the carbon precursor carbonized by grinding them; and
activating the equalized carbon precursor by adding an oxidizing agent and distilled water into the equalized carbon precursor and heat treating thereon, to form the activated carbon,
wherein a volume of the oxidizing agent is in a range of about 10 volume % to 50 volume % for a total of 100 volume % of the oxidizing agent and the distilled water, in the activating,
wherein the oxidizing agent includes H 2 O 2 , and wherein the activating is performed at a temperature in a range of about 700° C. to 1000° C.

2. The method of claim 1 , wherein the activating is performed while injecting a mixture of the oxidizing agent and the distilled water into the carbon precursor at a speed of about 1 ml/h to 100 ml/h.

3. The method of claim 2 , wherein the activating is performed under a pressure that is in a range of 0 bar to about 5 bar.

4. The method of claim 1 , wherein the activating is performed for a time that is in a range of about 1 h to 5 h.

5. The method of claim 1 , further comprising
reducing a surface of the activated carbon by heat treating thereon under an atmosphere including hydrogen (H 2 ).

6. The method of claim 5 , wherein the reducing is performed under a mixing environment in which an inert gas and hydrogen (H 2 ) gas are mixed, and
a volume of the hydrogen (H 2 ) gas is in a range of greater than 0 volume % to about 10 volume % for a total of 100 volume % of the inert gas and hydrogen (H 2 ) gas.

7. The method of claim 5 , wherein the reducing is performed at a temperature in a range of about 700° C. to 1000° C.

8. The method of claim 5 , wherein the reducing is performed for about 5 h to 10 h.

9. The method of claim 1 , further comprising
selecting the equalized carbon precursor by using a sieve having a size in a range of about 100 um to 250 um, after the equalizing.

10. The method of claim 1 , wherein the equalizing is performed by using a ball mill, and
a particle size of a ball used for the ball mill is in a range of about 1 mm to 20 mm.

11. The method of claim 10 , wherein a volume of the carbon precursor is in a range of about 0.1 volume % to 40 volume % for a total of 100 volume % of the carbon precursor and the ball mill, in the equalizing.

12. The method of claim 10 , wherein a processing speed for the ball mill is in a range of about 100 rpm to 500 rpm, in the equalizing.

13. The method of claim 10 , wherein a processing time for the ball mill is in a range of 30 minutes to 5 hours, in the equalizing.

14. The method of claim 1 , wherein the carbonizing is performed at a temperature that is in a range of about 700° C. to 1000° C.

15. The method of claim 1 , wherein the carbon precursor includes starch, coconut husks, citrus peel, coffee grounds, bamboo stems, or a combination thereof.

Assignees

• Hyundai Motor Co Ltd
• Inha Ind Partnership Inst

Inventors

• Bae Shin Tae
• Heo Young Jung
• Park Soo Jin

Classifications

• C01B32/342

  characterised by non-gaseous activating agents · CPC title

• B01J20/3064

  Addition of pore forming agents, e.g. pore inducing or porogenic agents · CPC title

• B01D2253/306

  Surface area, e.g. BET-specific surface · CPC title

• B01J20/28085

  being more than 50 nm, i.e. macropores · CPC title

• Y02C20/10

  of nitrous oxide (N2O) · CPC title