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US4468474A
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Iron/silicon-based catalyst exhibiting high selectivity to C2 -C62 Fischer-Tropsch reactions
Assignee: Honeywell International Inc
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Filing: 1983-05-16
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Granted: 1984-08-28
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Expires: 2003-05-16
Abstract
Abstract Finely divided, hydrogen-activated catalyst compositions comprising iron, silicon and carbon or iron and silicon that selectively convert gaseous mixtures of CO and H2, at a temperature of about 150 DEG -450 DEG C. and at pressures of about 10-2000 kPa, into reaction mixture containing at least about 75% C2-C6 alkenes and no more than about 25% of CH4 and undesirable CO2 by-products are disclosed. A wide range of iron/silicon-based catalyst compositions are conveniently prepared by laser pyrolysis and hydrogen-pretreatment and readily reactivated with hydrogen at elevated temperatures.
Inventors
- 👤 Arunava Gupta
- 👤 James T. Yardley
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 23:43
CPC Classifications
B; B01; B01J; B01J19/00; B01J19/08; B01J19/12; B01J19/121; B01J23/00; B01J23/70; B01J23/74; B01J23/745; B01J37/00; B01J37/34; B01J37/349; C; C07; C07C; C07C1/00; C07C1/02; C07C1/04; C07C1/0425; C07C1/043; C07C1/0435; C07C1/044; C07C2521/00; C07C2521/06; C07C2523/00; C07C2523/70; C07C2523/74; C07C2523/745
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
138 words
A finely divided hydrogen-activated catalyst composition comprising iron, silicon, and carbon and having improved selectivity to C 2 -C 6 alkene products in CO/H 2 reactions prepared by a process which comprises contacting, in the gaseous phase, effective amounts of a silicon compound, a hydrocarbon and an organo-iron compound in a first reaction zone in the presence of a laser under conditions of laser power absorption, flow rate and pressure sufficient to produce finely divided powder and thereafter contacting said finely divided powder with H 2 gas at 450°-550° C. in a second reactor zone, for a time sufficient to produce a hydrogen-activated catalyst composition wherein by bulk chemical elemental analysis iron is about 5 to about 15 atom percent, silicon is about 65 to about 88 atom percent, carbon is about 2 to about 30 atom percent.
Claim 2
Dependent Claim
138 words
A finely divided hydrogen-activated catalyst composition comprising iron, silicon, and carbon and having improved selectivity to C 2 -C 6 alkene products in CO/H 2 reactions prepared by a process which comprises contacting, in the gaseous phase, effective amounts of a silicon compound, a hydrocarbon and an organo-iron compound in a first reaction zone in the presence of a laser under conditions of laser power absorption, flow rate and pressure sufficient to produce finely divided powder and thereafter contacting said finely divided powder with H 2 gas at 450°-550° C. in a second reactor zone, for a time sufficient to produce a hydrogen-activated catalyst composition wherein by bulk chemical elemental analysis iron is about 5 to about 15 atom percent, silicon is about 65 to about 88 atom percent, carbon is about 2 to about 30 atom percent.
Claim 3
Dependent Claim
15 words
The catalyst composition of claim 1 wherein the catalyst composition comprises polycrystalline FeSi 2 .
Claim 4
Dependent Claim
39 words
The catalyst composition of claim 1 wherein the particles have a BET surface area of about 100-150 m 2 /g a spherical shape and a substantially uniform diameter in the range of about 10 nm to about 20 nm.
Claim 5
Dependent Claim
31 words
The catalyst composition of claim 1 wherein the silicon compound has the formula SiH 4-r X r wherein X is F or Cl and wherein r is 0, 1 or 2.
Claim 6
Dependent Claim
32 words
The catalyst composition of claim 1 wherein the hydrocarbon is selected from compounds having the formula C m H 2m-2 , C x H 2x , or C n H 2n+2 .
Claim 7
Dependent Claim
18 words
The catalyst composition of claim 1 wherein the organo-iron compound is Fe(CO) 5 , iron acetylacetonate or ferrocene.
Claim 8
Dependent Claim
120 words
A finely divided, hydrogen-activated catalyst comprising iron, silicon and carbon and having a high selectivity to C 2 -C 6 alkenes in CO/H 2 reactions, said catalyst being prepared by a process which comprises contacting effective amounts, in the gaseous phase, of a silicon compound, a hydrocarbon and an organo-iron compound under conditions to produce a product and thereafter contacting the product with H 2 gas at a temperature between about 450° C. and about 550° C. for a time sufficient to produce a hydrogen activated catalyst composition, wherein by bulk chemical analysis iron is about 5 to about 15 atoms percent, silicon is about 65 to about 88 atom percent, carbon is about 2 to about 30 atom percent.
Claim 9
Dependent Claim
120 words
A finely divided, hydrogen-activated catalyst comprising iron, silicon and carbon and having a high selectivity to C 2 -C 6 alkenes in CO/H 2 reactions, said catalyst being prepared by a process which comprises contacting effective amounts, in the gaseous phase, of a silicon compound, a hydrocarbon and an organo-iron compound under conditions to produce a product and thereafter contacting the product with H 2 gas at a temperature between about 450° C. and about 550° C. for a time sufficient to produce a hydrogen activated catalyst composition, wherein by bulk chemical analysis iron is about 5 to about 15 atoms percent, silicon is about 65 to about 88 atom percent, carbon is about 2 to about 30 atom percent.
Claim 10
Dependent Claim
15 words
The catalyst composition of claim 7 wherein the catalyst composition comprises polycrystalline FeSi 2 .
References Cited (Backward Citations)
US3755541A
Cited
US3979500A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1987-08-28 | 1988-02-27 | 1988-08-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-08-28 | 1992-02-27 | 1992-08-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-08-28 | 1996-02-27 | 1996-08-28 | $7700.00 | Window Closed / Lapsed |