Method for producing solid carbon by reducing carbon oxides
원문보기
IPC분류정보
국가/구분
United States(US) Patent
등록
국제특허분류(IPC7판)
D01F-009/12
C01B-031/00
D01C-005/00
C01B-031/04
C01D-003/00
B05D-007/00
출원번호
US-0263311
(2010-04-05)
등록번호
US-8679444
(2014-03-25)
국제출원번호
PCT/US2010/029934
(2010-04-05)
§371/§102 date
20111006
(20111006)
국제공개번호
WO2010/120581
(2010-10-21)
발명자
/ 주소
Noyes, Dallas B.
출원인 / 주소
Seerstone LLC
인용정보
피인용 횟수 :
13인용 특허 :
190
초록▼
A method for production of various morphologies of solid carbon product by reducing carbon oxides with a reducing agent in the presence of a catalyst. The carbon oxides are typically either carbon monoxide or carbon dioxide. The reducing agent is typically either a hydrocarbon gas or hydrogen. The d
A method for production of various morphologies of solid carbon product by reducing carbon oxides with a reducing agent in the presence of a catalyst. The carbon oxides are typically either carbon monoxide or carbon dioxide. The reducing agent is typically either a hydrocarbon gas or hydrogen. The desired morphology of the solid carbon product may be controlled by the specific catalysts, reaction conditions, and optional additives used in the reduction reaction. The resulting solid carbon products have many commercial applications.
대표청구항▼
1. A method for producing a solid carbon product, the method comprising: mixing a first gas stream containing carbon dioxide and a second gas stream containing a gaseous reducing agent to form a reaction gas mixture;supplying the reaction gas mixture to a reaction zone;reacting the carbon dioxide wi
1. A method for producing a solid carbon product, the method comprising: mixing a first gas stream containing carbon dioxide and a second gas stream containing a gaseous reducing agent to form a reaction gas mixture;supplying the reaction gas mixture to a reaction zone;reacting the carbon dioxide with the gaseous reducing agent in the reaction zone in the presence of an iron-containing catalyst to form water and the solid carbon product; andseparating at least a portion of the water formed in the reaction zone from the reaction gas mixture during the reaction of the carbon dioxide with the gaseous reducing agent. 2. The method of claim 1, wherein reacting the carbon dioxide with the reducing agent in the reaction zone in the presence of a catalyst to form the solid carbon product comprises forming a single-wall carbon nanotube, a multi-wall carbon nanotube, a carbon nanofiber, a graphite platelet, graphene, carbon black, amorphous carbon, or a combination thereof. 3. The method of claim 1, wherein reacting the carbon dioxide with the reducing agent in the reaction zone in the presence of a catalyst to form the solid carbon product comprises forming entangled agglomerations of carbon nanotubes. 4. The method of claim 1, further comprising continuously transferring a portion of the reaction gas mixture and the solid carbon product from the reaction zone to a separation process to separate the solid carbon product from the reaction gas mixture. 5. The method of claim 4, further comprising returning at least a portion of the reaction gas mixture to the reaction zone, wherein the at least a portion of the reaction gas mixture is substantially free of solids. 6. The method of claim 1, wherein the iron-containing catalyst comprises steel, or is formed by the reduction of one or more oxides of an element in steel. 7. The method of claim 1, wherein the iron-containing catalyst comprises an iron oxide, an iron carbide, or cementite. 8. The method of claim 1, wherein the second gas stream consists essentially of hydrogen. 9. The method of claim 1, wherein the second gas stream comprises at least one of a hydrocarbon gas, natural gas, or methane. 10. The method of claim 1, wherein the first gas stream consists essentially of carbon dioxide. 11. The method of claim 1, further comprising controlling a temperature of the reaction gas mixture in the reaction zone within a range from 400° C. to 900° C. 12. The method of claim 1, further comprising controlling a pressure in the reaction zone within a range from 0 torr. to 1000 torr. 13. The method of claim 1, further comprising controlling a pressure in the reaction zone within a range from 1000 torr. to 100 psig. 14. The method of claim 1, further comprising controlling a pressure in the reaction zone within a range from 100 psig to 1000 psig. 15. The method of claim 1, further comprising adding at least one of additional carbon dioxide or additional gaseous reducing agent to maintain a substantially constant pressure in the reaction zone after the carbon dioxide and the reducing agent begin reacting. 16. The method of claim 1, wherein the iron-containing catalyst comprises a self-supporting iron-containing catalyst. 17. The method of claim 16, wherein the self-supporting iron-containing catalyst comprises a carbon-containing steel. 18. The method of claim 1, wherein separating at least a portion of the water formed in the reaction zone from the reaction gas mixture during the reaction of the carbon dioxide with the gaseous reducing agent comprises condensing water. 19. The method of claim 1, wherein separating at least a portion of the water formed in the reaction zone from the reaction gas mixture during the reaction of the carbon dioxide with the gaseous reducing agent comprises cooling the reaction gas mixture to a temperature of about 3° C. or lower. 20. The method of claim 1, further comprising recirculating the reaction gas mixture to the reaction zone after separating at least a portion of the water therefrom. 21. The method of claim 1, further comprising compressing the reaction gas mixture after separating at least a portion of the water therefrom. 22. A method for producing a solid carbon product, the method comprising: disposing an iron-containing catalyst in a reaction zone;providing a reaction gas to the reaction zone, the reaction gas comprising carbon dioxide and a gaseous reducing agent;reacting the carbon dioxide with the gaseous reducing agent to form the solid carbon product and a reaction product gas comprising water;removing water from the reaction product gas while recirculating a dried portion of the reaction product gas to the reaction zone;providing at least one additional reaction gas during the formation of the solid carbon product to maintain a substantially constant pressure in the reaction zone; andmaintaining a temperature in the reaction zone from about 400° C. to about 900° C. 23. The method of claim 22, further comprising continuously removing the reaction product gas and the solid carbon product from the reaction zone.
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