Process for producing carbon nanofibers and/or carbon nanotubes

Patent metadata

Field	Value
Publication number	US-10010867-B2
Application number	US-201414485642-A
Country	US
Kind code	B2
Filing date	Sep 12, 2014
Priority date	Feb 27, 2009
Publication date	Jul 3, 2018
Grant date	Jul 3, 2018

Abstract

The invention is directed to a process for producing carbon nanofibers and/or carbon nanotubes, which process comprises pyrolyzing a particulate cellulosic and/or carbohydrate substrate that has been impregnated with a compound of an element or elements, the metal or alloy, respectively, of which is capable of forming carbides, in a substantially oxygen free, volatile silicon compound containing atmosphere, optionally in the presence of a carbon compound.

First claim

The invention claimed is:

1. A process for producing carbon nano fibers and/or tubes, the process comprising:
pyrolyzing a particulate cellulosic and/or carbohydrate substrate that has been impregnated with a metal compound or combination of metal compounds, which are capable of forming carbides, in the presence of volatile silicon compounds in a substantially oxygen free, inert stationary atmosphere, optionally in the presence of a carbon compound.

2. The process according to claim 1 , wherein the said substrate is selected from microcrystalline cellulose, sugar, or a mixture of sugar and microcrystalline cellulose, and soy meal.

3. The process according to claim 1 , wherein the substrate comprises carbonaceous bodies produced by a hydrothermal treatment of agricultural materials such as sugars, starch, soy meal, (hemi)cellulose; dehydrated products of the above compounds.

4. The process according to claim 1 , wherein the substrate is impregnated with a compound of nickel, cobalt, iron and/or molybdenum, followed by drying and pyrolyzing.

5. The process according to claim 1 , wherein the said substrate is pyrolysed in the presence of a silicon rubber compound.

6. The process according to claim 1 , wherein the said silicon compound is an alkyl siloxane.

7. The process according to claim 6 , wherein the said siloxane compound is a trimer of dimethyl siloxane.

8. A process according to claim 7 , wherein:
the pyrolyzing is at a temperature between 500 and 1000° C. for a period between 5 min and 5 hours; and
the atmosphere is substantially free of carbon compounds.

9. The process according to claim 1 , wherein the pyrolyzing is at a temperature between 500 and 1000° C. for a period between 5 min and 5 hours.

10. A process according to claim 9 , wherein:
the substrate comprises carbonaceous bodies produced by a hydrothermal treatment of agricultural materials, such as, sugars, starch, soy meal, (hemi)cellulose, as well as dehydrated products of the above compounds, such as, furfural and 2-hydroxyfurfural;
the substrate is impregnated with a compound of nickel, cobalt, iron and/or molybdenum, followed by drying and pyrolyzing;
and the said substrate is pyrolyzed in the presence of a silicon rubber compound.

11. The process according to claim 1 , wherein the atmosphere is substantially free of carbon compounds.

12. The process according to claim 1 , wherein the atmosphere further contains at least one carbon compound selected from the group consisting of toluene, CO, CO/H 2 mixtures, CH 4 , C 2 H 4 , lower alkanes, alkylenes, alcohols, alkyns, and aromatic compounds.

Assignees

• Basf Corp

Inventors

• Hoekstra Jacobus
• Geus John Wilhelm
• Jenneskens Leonardus Wijnand

Classifications

• B01J37/0238

  via the gaseous phase-sublimation · CPC title

• C10G49/06

  containing platinum group metals or compounds thereof · CPC title

• B01J37/084

  Decomposition of carbon-containing compounds into carbon · CPC title

• B01J23/755

  Nickel · CPC title

• B01J37/0219

  the coating containing organic compounds · CPC title