US5165909A
Expired / Lapsed
US
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Carbon fibrils and method for producing same
Assignee: Hyperion Catalysis International Inc
•
Filing: 1990-10-01
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Granted: 1992-11-24
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Expires: 2010-10-01
Abstract
Abstract The invention relates to carbon fibrils characterized by a substantially constant diameter, length greater than about 5 times the diameter, an ordered outer region of catalytically grown, multiple, substantially continuous layers of ordered carbon atoms having an outside diameter between about 3.5 and 70 nanometers, and a distinct inner core region. Each of the layers and the core are disposed substantially concentrically about the cylindrical axis of the fibril. The fibrils are substantially free of pyrolytically deposited thermal carbon with the diameter of the fibrils being equal to the outside diameter of the ordered outer region.
Inventors
- 👤 Howard G. Tennent
- 👤 James J. Barber
- 👤 Robert Hoch
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 06:52
CPC Classifications
B; B01; B01J; B01J21/00; B01J21/18; B01J27/00; B01J27/20; B01J35/00; B01J35/50; B01J35/58; B82; B82Y; B82Y30/00; C; C04; C04B; C04B14/00; C04B14/38; C04B14/386; C04B35/00; C04B35/01; C04B35/10; C04B35/111; C04B35/117; C04B35/16; C04B35/515; C04B35/56; C04B35/565; C04B35/58; C04B35/581; C04B35/584; C04B35/622; C04B35/62227; C04B35/62272; C04B35/71; C04B35/78; C04B35/80; C04B35/83; C08; C08K; C08K7/00; C08K7/02; C08K7/04; C08K7/06; D; D01; D01F; D01F11/00; D01F11/10; D01F11/12; D01F11/127; D01F9/00; D01F9/08; D01F9/12; D01F9/127; D01F9/1271; D01F9/1272; D01F9/1273; D01F9/1275; D01F9/1276; D01F9/1277; D01F9/1278; F; F16; F16D; F16D69/00; F16D69/02; F16D69/023; H; H01; H01B; H01B1/00; H01B1/02; H01B1/04; H01B1/14; H01B1/16; H01B1/18; H01B1/20; H01B1/24; B29; B29K; B29K2307/00; C04B2235/00; C04B2235/02; C04B2235/50; C04B2235/52; C04B2235/5208; C04B2235/5216; C04B2235/524; C04B2235/5248; C04B2235/5264; C04B2235/5284; C04B2235/5288; C04B2235/5296; Y; Y10; Y10T; Y10T428/00; Y10T428/29; Y10T428/2913; Y10T428/2918; Y10T428/2933; Y10T428/2935; Y10T428/2973; Y10T428/2975; Y10T428/30
Claims Analysis
Total Claims: 59
Claim 1
Independent Claim
130 words
A substantially cylindrical discrete carbon fibril characterized by a substantially constant diameter, length greater than about 5 times the diameter, an ordered outer region of multiple, substantially continuous layers of ordered carbon atoms having an outside diameter between about 3.5 and 70 nanometers which are catalytically grown from a gaseous carbon-containing compound, said ordered carbon atoms having c-axes that are substantially perpendicular to the cylindrical axis of the fibril, and a distinct inner core region, each of the layers and the core being disposed substantially concentrically about the cylindrical axis of the fibril, wherein said fibril is substantially free of pyrolytically deposited thermal carbon formed by thermal decomposition of the gaseous carbon-containing compound, wit the diameter of said fibril being equal tot eh outside diameter of said ordered outer region.
Claim 2
Dependent Claim
130 words
A substantially cylindrical discrete carbon fibril characterized by a substantially constant diameter, length greater than about 5 times the diameter, an ordered outer region of multiple, substantially continuous layers of ordered carbon atoms having an outside diameter between about 3.5 and 70 nanometers which are catalytically grown from a gaseous carbon-containing compound, said ordered carbon atoms having c-axes that are substantially perpendicular to the cylindrical axis of the fibril, and a distinct inner core region, each of the layers and the core being disposed substantially concentrically about the cylindrical axis of the fibril, wherein said fibril is substantially free of pyrolytically deposited thermal carbon formed by thermal decomposition of the gaseous carbon-containing compound, wit the diameter of said fibril being equal tot eh outside diameter of said ordered outer region.
Claim 3
Dependent Claim
10 words
A fibril of claim 1, wherein the core is hollow.
Claim 4
Dependent Claim
26 words
A fibril of claim 1, wherein the inner core region comprises carbon atoms which are less ordered than the ordered carbon atoms of the outer region.
Claim 5
Dependent Claim
12 words
A fibril of claim 1, wherein the ordered carbon atoms are graphitic.
Claim 6
Dependent Claim
16 words
A fibril of claim 1, wherein the length is greater than about 20 times the diameter.
Claim 7
Dependent Claim
15 words
A fibril of claim 1, wherein the diameter is between about 7 and 25 nanometers.
Claim 8
Dependent Claim
18 words
A fibril of claim 1, wherein the inner core region has a diameter greater than about 2 nonometers.
Claim 9
Dependent Claim
39 words
A method for producing a carbon fibril of claim 1 which comprises decreasing the length of a carbon fibril having the characteristics set forth in claim 1 but whose length is greater than about 10 2 times the diameter.
Claim 10
Dependent Claim
131 words
A plurality of substantially discrete carbon fibrils characterized by a substantially constant diameter, length greater than about 5 times the diameter, an ordered outer region of multiple, substantially continuous layers of ordered carbon atoms having an outside diameter between about 3.5 and 70 nanometers which are catalytically grown from a gaseous carbon compound, said ordered carbon atoms having c-axes that are substantially perpendicular to the cylindrical axis of the fibril, and a distinct inner core region, each of the layers and the core being disposed substantially concentrically around the cylindrical axis of the fibrils, wherein said fibrils are substantially free of pyrolytically deposited thermal carbon formed by thermal decomposition of the gaseous carbon-containing compound, with the diameter of said fibrils being equal to the outside diameter of said ordered outer region.
Claim 11
Dependent Claim
131 words
A plurality of substantially discrete carbon fibrils characterized by a substantially constant diameter, length greater than about 5 times the diameter, an ordered outer region of multiple, substantially continuous layers of ordered carbon atoms having an outside diameter between about 3.5 and 70 nanometers which are catalytically grown from a gaseous carbon compound, said ordered carbon atoms having c-axes that are substantially perpendicular to the cylindrical axis of the fibril, and a distinct inner core region, each of the layers and the core being disposed substantially concentrically around the cylindrical axis of the fibrils, wherein said fibrils are substantially free of pyrolytically deposited thermal carbon formed by thermal decomposition of the gaseous carbon-containing compound, with the diameter of said fibrils being equal to the outside diameter of said ordered outer region.
Claim 12
Independent Claim
171 words
A method for continuously producing carbon fibrils which comprises continuously contacting fibril-forming metal-containing particles with a gaseous, carbon-containing compound to catalytically grow substantially cylindrical carbon fibrils of substantially constant diameter, length greater than about 5 times the diameter, an ordered outer region of catalytically grown, multiple, substantially continuous layers of ordered carbon atoms having an outside diameter between about 3.5 and 70 nanometers, said ordered carbon atoms having c-axes that are substantially perpendicular to the cylindrical axis of the fibril, and a distinct inner core region, each of the layers and the core being disposed substantially concentrically about the cylindrical axis of the fibril, at a temperature below the thermal decomposition temperature of said carbon-containing compound to avoid significant formation of pyrolytic carbon formed by thermal decomposition of the gaseous carbon-containing compound on the catalytically grown outer region of said fibrils, and recovering the fibrils in a condition substantially free of pyrolytically deposited thermal carbon, with the diameter of said fibrils equal to the outer diameter of said ordered outer region.
Claim 13
Independent Claim
171 words
A method for continuously producing carbon fibrils which comprises continuously contacting fibril-forming metal-containing particles with a gaseous, carbon-containing compound to catalytically grow substantially cylindrical carbon fibrils of substantially constant diameter, length greater than about 5 times the diameter, an ordered outer region of catalytically grown, multiple, substantially continuous layers of ordered carbon atoms having an outside diameter between about 3.5 and 70 nanometers, said ordered carbon atoms having c-axes that are substantially perpendicular to the cylindrical axis of the fibril, and a distinct inner core region, each of the layers and the core being disposed substantially concentrically about the cylindrical axis of the fibril, at a temperature below the thermal decomposition temperature of said carbon-containing compound to avoid significant formation of pyrolytic carbon formed by thermal decomposition of the gaseous carbon-containing compound on the catalytically grown outer region of said fibrils, and recovering the fibrils in a condition substantially free of pyrolytically deposited thermal carbon, with the diameter of said fibrils equal to the outer diameter of said ordered outer region.
Claim 14
Dependent Claim
37 words
A method of claim 10 wherein the continuous contacting is effected by continuously introducing the gaseous carbon-containing compound into a reaction zone containing the metal-containing particle and continuously withdrawing the gaseous carbon-containing compound from the reaction zone.
Claim 15
Dependent Claim
40 words
A method of claim 10 wherein the continuous contacting is effected by continuously introducing the metal-containing particles into a reaction zone containing a defined volume of the gaseous, carbon-containing compound and continuously withdrawing the metal-containing particles from the reaction zone.
Claim 16
Dependent Claim
41 words
A method of claim 10 wherein the continuous contacting is effected by continuously introducing the metal-containing particles and the gaseous, carbon-containing compound into a reaction zone and continuously withdrawing the metal-containing particles and the gaseous carbon-containing compound from the reaction zone.
Claim 17
Dependent Claim
29 words
A method of claim 13 wherein the withdrawn gaseous carbon-containing compound is treated so as to remove any undesirable material and is then continuously reintroduced into the reaction zone.
Claim 18
Dependent Claim
29 words
A method of claim 14 wherein the gaseous carbon-containing compound is carbon monoxide and the treatment comprises removing carbon dioxide form the carbon monoxide withdrawn from the reaction zone.
Claim 19
Dependent Claim
36 words
A method of claim 12 wherein the withdrawn metal-containing particles are treated so as to remove any undesirable material and recover carbon fibrils and the particles so treated are then continuously reintroduced into the reaction zone.
Claim 20
Dependent Claim
17 words
A method of claim 10 wherein the carbon fibrils are recovered in association with the metal-containing particles.
Claim 21
Dependent Claim
17 words
A method of claim 17 wherein the carbon fibrils in association with the particles are continuously recovered.
Claim 22
Dependent Claim
40 words
A method of claim 18 wherein a portion of the carbon fibrils in association with the particles so recovered are treated with additional metal-containing particles and the fibrils so treated are continuously reintroduced into contact with the gaseous carbon-containing compound.
Claim 23
Dependent Claim
35 words
A method according to claim 10 wherein the contacting of the metal-containing particles with the carbon-containing compound is carried out in the presence of a compound capable of reaction with carbon to produce gaseous products.
Claim 24
Dependent Claim
25 words
A method according to claim 20 wherein the compound capable of reacting with carbon is CO 2 , H 2 , or H 2 O.
Claim 25
Dependent Claim
13 words
A method according to claim 10 wherein the carbon-containing compound is carbon monoxide.
Claim 26
Dependent Claim
13 words
A method according to claim 10 wherein the carbon-containing compound is a hydrocarbon.
Claim 27
Dependent Claim
11 words
A method according to claim 23 wherein the hydrocarbon contains oxygen.
Claim 28
Dependent Claim
20 words
A method according to claim 24 wherein the oxygen containing hydrocarbon is formaldehyde, acetaldehyde, acetone, methanol, ethanol, or mixture thereof.
Claim 29
Dependent Claim
11 words
A method according to claim 23 wherein the hydrocarbon is aromatic.
Claim 30
Dependent Claim
22 words
A method according to claim 26 wherein the aromatic hydrocarbon is benzene, toluene, xylene, cumene, ethylbenzene, naphthalene, phenanthrene, anthracene or mixtures thereof.
Claim 31
Dependent Claim
11 words
A method according to claim 23 wherein the hydrocarbon is non-aromatic.
Claim 32
Dependent Claim
20 words
A method according to claim 28 wherein the hydrocarbon is methane, ethane, propane, ethylene, propylene or acetylene or mixture thereof.
Claim 33
Dependent Claim
11 words
A method according to claim 29 wherein the hydrocarbon is methane.
Claim 34
Dependent Claim
25 words
A method according to claim 10 wherein the metal-containing particle comprises an iron-, cobalt-, or nickel-containing particle having a diameter between 3.5 and 70 nanometers.
Claim 35
Dependent Claim
18 words
A method according to claim 10 wherein the metal-containing particle is supported on a chemically compatible, refractory support.
Claim 36
Dependent Claim
11 words
A method according to claim 32 wherein the support is alumina.
Claim 37
Dependent Claim
11 words
A method according to claim 32 wherein the support is carbon.
Claim 38
Dependent Claim
13 words
A method according to claim 34 wherein the carbon is a carbon fiber.
Claim 39
Dependent Claim
13 words
A method according to claim 34 wherein the carbon is a carbon fibril.
Claim 40
Dependent Claim
13 words
A method according to claim 34 wherein the carbon is a carbon plate.
Claim 41
Dependent Claim
12 words
A method according to claim 32 wherein the support is a silicate.
Claim 42
Dependent Claim
13 words
A method according to claim 38 wherein the silicate is an aluminum silicate.
Claim 43
Dependent Claim
15 words
A method according to claim 10 wherein the metal-containing particles are derived from metal salts.
Claim 44
Dependent Claim
12 words
A method of claim 40 wherein the metal salt is iron oxalate.
Claim 45
Dependent Claim
67 words
A method according to claim 10 wherein the metal-containing particle is contacted with the carbon-containing gas for a period of time from about 10 seconds to about 30 minutes and at a pressure from about one-tenth atmospheres to about ten atmospheres, the metal-containing particle is an iron-containing particle, the gaseous, carbon-containing compound is carbon monoxide and the temperature is from about 900° C. to about 1150° C.
Claim 46
Dependent Claim
46 words
A method according to claim 42 wherein the metal-containing particle is contacted with the carbon-containing gas for a period of time of about 10 minutes and at a pressure of about one atmosphere, the carbon-containing compound is carbon monoxide and the temperature is about 1000° C.
Claim 47
Dependent Claim
49 words
A method according to claim 42 wherein the metal-containing particle is contacted with the carbon-containing gas for a period of time from about one to about five minutes and at a pressure of about one atmosphere, the carbon-containing compound is carbon monoxide and the temperature is about 1100° C.
Claim 48
Dependent Claim
18 words
A method according to claim 42 wherein the iron-containing particle is supported on a chemically compatible, refractory support.
Claim 49
Dependent Claim
17 words
A method according to claim 45 wherein the refractory support is alumina, carbon fiber or carbon fibril.
Claim 50
Dependent Claim
39 words
A method according to claim 10 wherein the metal-containing particles are independently heated to a temperature between about 850° C. and about 1800° C., the temperature or the particles being higher than the temperature of the gaseous, carbon-containing compound.
Claim 51
Dependent Claim
14 words
A method according to claim 47 wherein the particles are heated with electromagnetic radiation.
Claim 52
Dependent Claim
11 words
A carbon fibril produced according to the method of claim 10.
Claim 53
Independent Claim
169 words
A method for producing a substantially uniform plurality of carbon fibrils which comprises continuously contacting fibril-forming metal-containing particles with a gaseous, carbon-containing compound to catalytically grow substantially cylindrical carbon fibrils of substantially constant diameter, length greater than about 5 times the diameter, an ordered outer region of catalytically grown, multiple, substantially continuous layers of ordered carbon atoms having an outside diameter between about 3.5 and b 70 nanometers, said ordered carbon atoms comprising graphitic domains whose c-axes are substantially perpendicular to the cylindrical axis of the fibril, and a distinct inner core region, each of the layers and the core being disposed substantially concentrically about the cylindrical axis of the fibril, at a temperature below the thermal decomposition temperature of said carbon-containing compound to avoid significant formation of pyrolytic carbon on the catalytically grown outer region of said fibrils, and recovering the fibrils in a condition substantially free of pyrolytically deposited thermal carbon, with the diameter of said fibrils equal to the outer diameter of said ordered outer region.
Claim 54
Independent Claim
169 words
A method for producing a substantially uniform plurality of carbon fibrils which comprises continuously contacting fibril-forming metal-containing particles with a gaseous, carbon-containing compound to catalytically grow substantially cylindrical carbon fibrils of substantially constant diameter, length greater than about 5 times the diameter, an ordered outer region of catalytically grown, multiple, substantially continuous layers of ordered carbon atoms having an outside diameter between about 3.5 and b 70 nanometers, said ordered carbon atoms comprising graphitic domains whose c-axes are substantially perpendicular to the cylindrical axis of the fibril, and a distinct inner core region, each of the layers and the core being disposed substantially concentrically about the cylindrical axis of the fibril, at a temperature below the thermal decomposition temperature of said carbon-containing compound to avoid significant formation of pyrolytic carbon on the catalytically grown outer region of said fibrils, and recovering the fibrils in a condition substantially free of pyrolytically deposited thermal carbon, with the diameter of said fibrils equal to the outer diameter of said ordered outer region.
Claim 55
Dependent Claim
15 words
A substantially uniform plurality of carbon fibrils produced according to the method of claim 50.
Claim 56
Independent Claim
185 words
A method for producing a carbon fibril which comprises the steps of contacting a fibril-forming metal-containing particle with a gaseous, carbon-containing compound to catalytically grow a substantially cylindrical carbon fibril of substantially constant diameter, length greater than about 5 times the diameter, an ordered outer region of multiple, substantially continuous layers of ordered carbon atoms having an outside diameter between about 3.5 and 70 nanometers which are catalytically grown from a gaseous carbon-containing compound, said ordered carbon atoms having c-axes that are substantially perpendicular to the cylindrical axis of the fibril, and a distinct inner core region, each of the layers and the core being disposed substantially concentrically about the cylindrical axis of the fibril, the temperature during said contacting being below the thermal decomposition temperature of the gaseous carbon-containing compound to avoid significant formation of pyrolytically deposited thermal carbon formed by thermal decomposition of the gaseous carbon-containing compound on said catalytically grown outer region; and recovering said fibril in a condition substantially free of pyrolytically deposited thermal carbon, with the diameter of said fibril equal to the outside diameter of said ordered outer region.
Claim 57
Independent Claim
185 words
A method for producing a carbon fibril which comprises the steps of contacting a fibril-forming metal-containing particle with a gaseous, carbon-containing compound to catalytically grow a substantially cylindrical carbon fibril of substantially constant diameter, length greater than about 5 times the diameter, an ordered outer region of multiple, substantially continuous layers of ordered carbon atoms having an outside diameter between about 3.5 and 70 nanometers which are catalytically grown from a gaseous carbon-containing compound, said ordered carbon atoms having c-axes that are substantially perpendicular to the cylindrical axis of the fibril, and a distinct inner core region, each of the layers and the core being disposed substantially concentrically about the cylindrical axis of the fibril, the temperature during said contacting being below the thermal decomposition temperature of the gaseous carbon-containing compound to avoid significant formation of pyrolytically deposited thermal carbon formed by thermal decomposition of the gaseous carbon-containing compound on said catalytically grown outer region; and recovering said fibril in a condition substantially free of pyrolytically deposited thermal carbon, with the diameter of said fibril equal to the outside diameter of said ordered outer region.
Claim 58
Dependent Claim
21 words
The method of claim 52 wherein said temperature is below the temperature required to thermally form layers of ordered carbon atoms.
Claim 59
Dependent Claim
24 words
The method of claim 52 wherein the ratio on a dry weight basis of carbon-containing compound to metal-containing particle is at least about 100:1.
References Cited (Backward Citations)
US2796331A
Cited
US3816609A
Cited
GB1469930A
Cited
US4710483A
Cited
SU729211A1
Cited
US4391787A
Cited
SU925969A1
Cited
US4565683A
Cited
JPS57117622A
Cited
US4642125A
Cited
US4394478A
Cited
US4362569A
Cited
US4650657A
Cited
US4767737A
Cited
US4743431A
Cited
US4518575A
Cited
JPS58197314A
Cited
US4497788A
Cited
JPS59152299A
Cited
US4491569A
Cited
US4701317A
Cited
US4534919A
Cited
US4572813A
Cited
US4659624A
Cited
US4816289A
Cited
US4770867A
Cited
US4591334A
Cited
US4565684A
Cited
US4749557A
Cited
US4663230A
Cited
US4738828A
Cited
US4583299A
Cited
EP0198558A2
Cited
JPS6418913A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1995-11-24 | 1996-05-25 | 1996-11-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1999-11-24 | 2000-05-25 | 2000-11-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2003-11-24 | 2004-05-25 | 2004-11-24 | $7700.00 | Window Closed / Lapsed |