US4668647A
Expired / Lapsed
US
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Iron carbide-based catalyst produced in the presence of laser radiation
Assignee: ExxonMobil Technology and Engineering Co
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Filing: 1985-05-20
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Granted: 1987-05-26
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Expires: 2005-05-20
Abstract
Abstract This invention relates to a finely divided iron carbide-based catalyst which is produced by a gas phase pyrolytic decomposition reaction driven by a laser. The catalysts may be used to produce various hydrocarbons, including olefins, from CO and H2.
Inventors
- 👤 Gary W. Rice
- 👤 Rocco A. Fiato
- 👤 Stuart L. Soled
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 20:44
CPC Classifications
B; B22; B22F; B22F9/00; B22F9/16; B22F9/30; B01; B01J; B01J27/00; B01J27/20; B01J27/22; B01J37/00; B01J37/34; B01J37/349; C; C07; C07C; C07C1/00; C07C1/02; C07C1/04; C07C1/0425; C07C1/0445; B01J2219/00; B01J2219/00049; B01J2219/00051; B01J2219/00159; B01J2219/00186; C07C2521/00; C07C2521/10; C07C2521/18; C07C2523/00; C07C2523/02; C07C2523/04; C07C2523/70; C07C2523/74; C07C2523/745
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
81 words
A composition of matter comprising finely divided non-pyrophoric iron-carbon catalytic particles comprising iron and carbon in the substantial absence of silicon, a substantial portion of which is cementite, produced in a reaction zone in the presence of laser radiation under such conditions of laser flux density, power adsorption, concentration of iron compound reactants selected from the group consisting of iron carbonyls, iron acetylacetonate, and ferrocene, and pressure sufficient to produce non-pyrophoric iron-carbon particles having average diameters between 1 and 100 nm.
Claim 2
Dependent Claim
81 words
A composition of matter comprising finely divided non-pyrophoric iron-carbon catalytic particles comprising iron and carbon in the substantial absence of silicon, a substantial portion of which is cementite, produced in a reaction zone in the presence of laser radiation under such conditions of laser flux density, power adsorption, concentration of iron compound reactants selected from the group consisting of iron carbonyls, iron acetylacetonate, and ferrocene, and pressure sufficient to produce non-pyrophoric iron-carbon particles having average diameters between 1 and 100 nm.
Claim 3
Dependent Claim
20 words
The composition of claim 1 wherein at least a portion of the iron is in the α and γ phase.
Claim 4
Dependent Claim
14 words
The composition of claim 1 wherein the particles contain at least some free carbon.
Claim 5
Dependent Claim
19 words
The composition of claim 3 wherein at least some of said free carbon is situated on the particles' surface.
Claim 6
Dependent Claim
15 words
The composition of claim 1 wherein said average diameters are between 10 and 50 nm.
Claim 7
Dependent Claim
13 words
The composition of claim 1 wherein said iron compound is Fe(CO) 5 .
Claim 8
Dependent Claim
14 words
The composition of claim 1 wherein said particles are supported on a refractory support.
Claim 9
Dependent Claim
14 words
The composition of claim 6, wherein the particles are supported on a refractory support.
Claim 10
Independent Claim
63 words
A method for producing finely divided non-pyrophoric iron-carbon catalytic particles comprising the steps of: introducing an iron compound from the group consisting of iron carbonyls, iron acetylacentonate and ferrocene into a reaction chamber into which a laser is focused at such conditions of total pressure, iron compound partial pressure, laser energy flux density and power absorption that said finely divided particles are produced.
Claim 11
Independent Claim
63 words
A method for producing finely divided non-pyrophoric iron-carbon catalytic particles comprising the steps of: introducing an iron compound from the group consisting of iron carbonyls, iron acetylacentonate and ferrocene into a reaction chamber into which a laser is focused at such conditions of total pressure, iron compound partial pressure, laser energy flux density and power absorption that said finely divided particles are produced.
Claim 12
Dependent Claim
13 words
The process of claim 9 wherein the iron compound is Fe(CO) 5 .
Claim 13
Dependent Claim
16 words
The process of claim 9 wherein an additional carbon-bearing compound is introduced into said reaction chamber.
Claim 14
Dependent Claim
15 words
The process of claim 11 wherein the carbon-bearing compound is a low molecular weight alkene.
Claim 15
Dependent Claim
11 words
The process of claim 11 wherein the carbon-bearing compound is ethylene.
Claim 16
Dependent Claim
23 words
The process of claim 9 wherein the laser energy flux density in said reaction chamber is between 200 and 10,000 W/cm 2 .
Claim 17
Dependent Claim
26 words
The process of claim 14 wherein the laser used to produce said laser energy flux density is a CO 2 laser operating in the continuous mode.
Claim 18
Dependent Claim
22 words
The process of claim 14 wherein the residence time of the reactants in the reaction zone is between 1 and 60 ms.
References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1990-05-25 | 1990-11-24 | 1991-05-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-05-25 | 1994-11-24 | 1995-05-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-05-25 | 1998-11-24 | 1999-05-26 | $7700.00 | Window Closed / Lapsed |