IP Library › Granted Patent US 12,195,338
Granted Patent B2
US 12,195,338 · App. 18/494,522 · Granted Jan 14, 2025

Systems, methods, and device for pyrolysis of methane in a microwave plasma for hydrogen and structured carbon powder production

Inventor: Jared Majcher (Portsmouth, NH)
Assignee: 6K Inc.
C01B32/184C01B3/24C07C2/78H05H1/30C01B2203/0272C01B2203/0855C01B2203/0861C01B2203/1241C01P2002/72C01P2004/03H05H2245/10
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Quick Facts
Patent No.
US 12,195,338
App. No.
18/494,522
Filed
Oct 25, 2023
Granted
Jan 14, 2025
Kind
B2
Art Unit
1732
USPC
423/461
Abstract

The embodiments disclosed herein are directed to systems, methods, and devices for pyrolysis of methane in a microwave plasma for hydrogen production and structured carbon powder. Some methods are directed to producing a structured carbon powder using a microwave generated plasma comprising injecting a plasma gas comprising methane (CH 4 ) into a liner, the liner in communication with a microwave waveguide; propagating microwaves through the microwave waveguide, the microwaves generated using a microwave generator; and generating a microwave plasma by contacting the plasma gas with the microwaves.

Claims (25)

1. A method for producing a structured carbon powder using a microwave generated plasma, the method comprising:

injecting a plasma gas comprising methane (CH 4 ) into a liner, the liner in communication with a microwave waveguide;

propagating microwaves through the microwave waveguide, the microwaves generated using a microwave generator, wherein the microwave waveguide is oriented perpendicular to the liner;

generating a microwave plasma by contacting the plasma gas with the microwaves;

directing the microwave plasma through a graphite extension tube, the extension tube extending into a reaction chamber and confining the microwave plasma, and wherein the extension tube tapers radially outwards as it extends into the reaction chamber;

wherein contacting the plasma gas with the microwaves pyrolyzes the plasma gas into pyrolysis products,

wherein the pyrolysis products comprise hydrogen gas and solid carbon, and

wherein the solid carbon comprises a sheet or platelet microstructure.

2. The method of claim 1 , wherein a pressure within the liner is 760 Torr.

3. The method of claim 1 , wherein a frequency of the microwaves is between about 300 MHz and about 300 GHz.

4. The method of claim 1 , wherein a frequency of the microwaves is about 915 MHz.

5. The method of claim 1 , wherein the liner comprises quartz.

6. The method of claim 1 , wherein the methane comprises less than about 5 vol % of the plasma gas.

7. The method of claim 1 , wherein the solid carbon comprises a sheet microstructure, and wherein edges of the carbon sheets measure between about 100 nm and about 1000 nm in length.

8. The method of claim 1 , wherein the solid carbon comprises a sheet microstructure, and wherein edges of the carbon sheets measure between about 50 nm and about 150 nm in length.

9. The method of claim 1 , wherein the solid carbon comprises no amorphous carbon.

10. The method of claim 1 , wherein the solid carbon comprises no carbon nanotubes.

11. The method of claim 1 , wherein the solid carbon comprises nanosheets of graphene.

12. The method of claim 1 , wherein the pyrolysis products comprise acetylene (C 2 H 2 ).

13. The method of claim 1 , wherein the pyrolysis products comprise at least one of CH 3 , C 2 H 5 , and C 2 H 3 .

14. The method of claim 1 , wherein the plasma gas is contacted with the microwaves in the absence of a catalyst.

15. The method of claim 1 , wherein the plasma gas comprises argon (Ar).

16. The method of claim 1 , wherein the plasma gas comprises hydrogen (H 2 ).

17. The method of claim 1 , wherein the plasma gas is injected into the liner at a temperature above 500° C.

18. The method of claim 1 , wherein the solid carbon is solidified from a gas phase.

Assignments (1)
ASSIGNMENT OF ASSIGNOR'S INTEREST Recorded Oct 26, 2023
From: MAJCHER, JARED
To: 6K INC.
Reel/Frame 065356/0504 →
Continuity (2)
Provisional Application 63387669 · Dec 15, 2022
Related Publication 20240199427A1 · Jun 20, 2024
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