EP0128302A1
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EP
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Iron/silicon-based catalyst exhibiting high selectivity to C2-C6 alkenes in CO/H2 Fischer-Tropsch reactions
Assignee: Honeywell International Inc
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Filing: 1984-04-12
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Granted: —
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Expires: 2004-04-12
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 H 2 , at a temperature of 150° bis 450°C and at pressures of 10-2000 kPa, into reaction mixture containing at least about 75% C 2 -C 6 alkenes and no more than about 25% of CH 4 and undesirable C0 2 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 Thomas Yardley
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-02 22:45
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: 13
Claim 1
Independent Claim
119 words
A process for conversion of CO/H 2 into low molecular weight olefins which comprises contacting a gaseous mixture comprising CO and H 2 in the ratio of 3:1 to 1:5 (v/v) with an effective amount of a finely divided, hydrogen-activated catalyst composition comprising 5-15 atom percent Fe 65-88 atom percent Si and 2-30 atom percent C or 10-30 atom percent Fe and 70-90 atom percent Si in a reaction zone at a temperature in the range of 150°C to 450°C and a pressure in the range of 10 to 2000 kPa in the absence of externally supplied promoters for a time sufficient to produce a reaction mixture comprising C 1 -C 4 alkanes and C 2 -C 6 alkenes.
Claim 2
Dependent Claim
119 words
A process for conversion of CO/H 2 into low molecular weight olefins which comprises contacting a gaseous mixture comprising CO and H 2 in the ratio of 3:1 to 1:5 (v/v) with an effective amount of a finely divided, hydrogen-activated catalyst composition comprising 5-15 atom percent Fe 65-88 atom percent Si and 2-30 atom percent C or 10-30 atom percent Fe and 70-90 atom percent Si in a reaction zone at a temperature in the range of 150°C to 450°C and a pressure in the range of 10 to 2000 kPa in the absence of externally supplied promoters for a time sufficient to produce a reaction mixture comprising C 1 -C 4 alkanes and C 2 -C 6 alkenes.
Claim 3
Dependent Claim
17 words
The process of claim 1 wherein the hydrogen-activated catalyst composition comprising iron, silicon and carbon is used.
Claim 4
Dependent Claim
42 words
The process of claim 2 wherein the catalyst composition has a bulk elemental analysis wherein iron is 10 atom percent, silicon is 72 atom percent, and carbon is 17 atom percent and wherein the hydrogen-activated catalyst composition comprises polycrystalline FeS i 2.
Claim 5
Dependent Claim
37 words
The process of claim 1 wherein the gaseous mixture comprises about one volume of CO and about 2-3 volumes of H 2 and wherein the pressures are 100 to 1000 kPa and wherein the temperature is 250°-350°C.
Claim 6
Dependent Claim
13 words
The process of claim 1 wherein the reaction zone is a slurry-type reactor.
Claim 7
Dependent Claim
128 words
A finely divided hydrogen-activated catalyst composition comprising iron, silicon, and carbon and having improved selectivity to C2-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 5 to 15 atom percent,silicon is 65 to 88 atom percent, carbon is 2 to 30 atom percent.
Claim 8
Dependent Claim
128 words
A finely divided hydrogen-activated catalyst composition comprising iron, silicon, and carbon and having improved selectivity to C2-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 5 to 15 atom percent,silicon is 65 to 88 atom percent, carbon is 2 to 30 atom percent.
Claim 9
Dependent Claim
15 words
The catalyst composition of claim 6 wherein the catalyst composition comprises polycrystalline FeSi 2 .
Claim 10
Dependent Claim
37 words
The catalyst composition of claim 6 wherein the particles have a BET surface area of 100-150 m 2 /g a spherical shape and a substantially uniform diameter in the range of 10 nm to about 20 nm.
Claim 11
Dependent Claim
56 words
The catalyst composition of claim 6 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 and 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 12
Dependent Claim
77 words
A finely divided, hydrogen-activated catalyst comprising iron, silicon and carbon and having a high selectivity to C 1 -C 6 alkenes in CO/H 2 reaction, wherein by bulk chemical analysis iron is about 5 to about 15 atom percent, silicon is 65 to 88 atom percent, carbon is 10 to 30 atom percent and oxygen may be present in the amount of 0.094 to 0.125 atom percent and wherein the catalyst composition comprises polycrystalline FeSi 2 .
Claim 13
Dependent Claim
77 words
A finely divided, hydrogen-activated catalyst comprising iron, silicon and carbon and having a high selectivity to C 1 -C 6 alkenes in CO/H 2 reaction, wherein by bulk chemical analysis iron is about 5 to about 15 atom percent, silicon is 65 to 88 atom percent, carbon is 10 to 30 atom percent and oxygen may be present in the amount of 0.094 to 0.125 atom percent and wherein the catalyst composition comprises polycrystalline FeSi 2 .
References Cited (Backward Citations)
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