Process for preparing a carbon foam and use of the material obtained

Patent metadata

Field	Value
Publication number	US-9428387-B2
Application number	US-201214235642-A
Country	US
Kind code	B2
Filing date	Jul 26, 2012
Priority date	Jul 27, 2011
Publication date	Aug 30, 2016
Grant date	Aug 30, 2016

Abstract

The present invention relates to a process for preparing a carbon foam, from selected oxocarbons or pseudo-oxocarbons, at low temperature and to the use of the material obtained via the implementation of this process for the manufacture of a system for detecting light waves.

First claim

The invention claimed is:

1. A process for preparing a porous carbon material, wherein said method comprises at least one step of heat treatment at a temperature of at least 300° C., under a nonoxidizing atmosphere, of an organic molecule selected from the oxocarbons and oxocarbon derivatives of formulae (I-1) to (I-7) below:

in which:
R 1 to R 8 , R 13 to R 21 , and R 24 , independently of one another, represent OH; SH; an O-alkyl or S-alkyl group in which the alkyl radical is linear and has from 1 to 4 carbon atoms; an O-aryl or S-aryl group in which the aryl ring is a phenyl ring or a phenyl ring substituted in para position by an O-methyl or S-methyl group; or a group NR 25 R 26 in which the radicals R 25 and R 26 , which are identical or different, represent a C 1 -C 4 alkyl radical;
R 9 to R 12 and R 22 and R 23 , independently of one another, represent an oxygen or sulfur atom; an N—CN (isocyano) group; or a C(CN) 2 (malononitrile) group.

2. The process as claimed in claim 1 , wherein in the compounds of formulae (I-1) to (I-7):
the alkyl radical stated for R 1 to R 8 , R 13 to R 21 , and R 24 is a methyl radical;
R 25 and R 26 are identical and represent a methyl.

3. The process as claimed in claim 1 , wherein the process employs an organic molecule selected from the compounds of formulae (I-1) to (I-7) in which the substituents R are selected from OH and O.

4. The process as claimed in claim 1 , wherein the organic molecule is a compound of formula (I-3) in which R 7 =R 8 =OH and R 9 =O, or a compound of formula (I-7) in which R 22 =R 23 =O and R 21 =R 24 =OH.

5. The process as claimed in claim 1 , wherein the heat treatment temperature is 400° C.

6. The process as claimed in claim 1 , wherein the nonoxidizing atmosphere is provided by a stream of dinitrogen, argon, helium, hydrogen, said streams being used alone or as a mixture.

7. The process as claimed in claim 1 , wherein the heat treatment is carried out at atmospheric pressure and without metal catalyst.

8. The process as claimed in claim 1 , wherein the organic starting molecule is used in powder form.

9. The process as claimed in claim 1 , wherein the duration of the heat treatment is from 2 to 4 hours.

10. The process as claimed in claim 1 , wherein the heat treatment is carried out with a temperature rise of from 1 to 10° C./minute, from the ambient temperature to the desired temperature.

Assignees

• Poizot Philippe
• Dolhem Franck
• Chotard Jean-Noel
• Centre Nat Rech Scient
• Univ Picardie

Inventors

• Poizot Philippe
• Dolhem Franck
• Chotard Jean-Noel

Classifications

• B01J20/3078

  Thermal treatment, e.g. calcining or pyrolizing · CPC title

• H01M4/96

  Carbon-based electrodes · CPC title

• B01J20/28045

  Honeycomb or cellular structures; Solid foams or sponges · CPC title

• B01J20/28083

  being in the range 2-50 nm, i.e. mesopores · CPC title

• B01J20/20

  comprising free carbon; comprising carbon obtained by carbonising processes · CPC title