Porous carbon and method of preparing the same

Patent metadata

Field	Value
Publication number	US-9428390-B2
Application number	US-201314417311-A
Country	US
Kind code	B2
Filing date	Jul 24, 2013
Priority date	Jul 27, 2012
Publication date	Aug 30, 2016
Grant date	Aug 30, 2016

Abstract

This disclosure relates to porous carbon and a method of preparing the same. The porous carbon of the present invention is derived from a carbonitride compound having a composition comprising metal and nitrogen. The porous carbon of the present invention comprises both micropores and mesopores, and has a large specific surface area, and thus, may be usefully used in various fields.

First claim

The invention claimed is:

1. A method for preparing porous carbon comprising the steps of:
mixing at least one metal source selected the group consisting of metals selected from Ti, V, Cr, Zr, Nb, Mo, W, Hf, and Ta, and oxides thereof with a carbon source;
heating the mixture under nitrogen atmosphere to form a carbonitride compound;
reacting the carbonitride compound with halogen gas; and
heating the reaction mixture under hydrogen atmosphere.

2. The method according to claim 1 , wherein the carbonitride compound has a composition represented by the following Formula 1:
M(C x N y )  [Formula 1]

in the Formula 1, M is at least one metal selected from the group consisting of Ti, V, Cr, Zr, Nb, Mo, W, Hf, and Ta;
x is 0.2 to 0.99, and y is 0.01 to 0.8.

3. The method according to claim 1 , wherein in the step of mixing a metal source with a carbon source, at least one selected from the group consisting of a hydrogen source, a boron source and an oxygen source is further added and mixed.

4. The method according to claim 3 , wherein the carbonitride compound has a composition represented by the following Formula 2:
M(C x N y A z )  [Formula 2]

in the Formula 2, M is at least one metal selected from the group consisting of Ti, V, Cr, Zr, Nb, Mo, W, Hf, and Ta;
A is boron (B), hydrogen (H) or oxygen (O);
x is 0.2 to 0.99, y is 0.01 to 0.8, and z is 0.01 to 0.2.

5. The method according to claim 1 , further comprising the step of pulverizing the mixture, simultaneously with or after the step of mixing a metal source with a carbon source.

6. The method according to claim 5 , wherein the step of pulverizing the mixture is conducted using a high energy ball mill.

7. The method according to claim 1 , wherein the step of heating the mixture to form a carbonitride compound is conducted at a temperature of 800 to 1.600° C. for 5 minutes to 5 hours.

8. The method according to claim 1 , wherein the halogen gas is chlorine (Cl 2 ) gas.

9. The method according to claim 1 , wherein the step of reacting a carbonitride compound with halogen gas is conducted at a temperature of 400 to 1,200° C. for 1 to 5 hours.

10. The method according to claim 1 , wherein the step of heating under hydrogen atmosphere is conducted at a temperature of 400 to 1,000° C.

11. The method according to claim 1 , further comprising the step of activating pores, after the step of heating under hydrogen atmosphere.

12. The method according to claim 11 , wherein the step of activating pores comprises
heating the porous carbon under atmosphere of at least one gas selected from the group consisting of inert gas and N 2 gas; and
flowing carbon dioxide gas (CO 2 ) at the heated temperature.

Assignees

• Hanwha Chemical Corp
• Snu R&Db Foundation

Inventors

• Kang Shin Hoo
• Ihm Ji Soon
• Kim Dong Ok
• Seo Moon-Su

Classifications

• C01B32/318

  characterised by the starting materials · CPC title

• B01J21/18

  Carbon · CPC title

• C01P2006/12

  Surface area · CPC title

• B01J27/24

  Nitrogen compounds · CPC title

• C01B32/00 Primary

  Carbon; Compounds thereof (C01B21/00, C01B23/00 take precedence; percarbonates C01B15/10; carbon black C09C1/48) · CPC title