US4003850A
Expired / Lapsed
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Novel iron oxide catalysts
Assignee: Braskem America Inc
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Filing: 1973-08-23
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Granted: 1977-01-18
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Expires: 1993-08-23
Abstract
Abstract Iron oxide catalysts prepared by absorbing iron pentacarbonyl upon a suitable support followed by oxidation to iron oxide.
Inventors
- 👤 Robert H. Callighan
- 👤 John O. Hawthorne
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 11:16
CPC Classifications
B; B01; B01J; B01J23/00; B01J23/70; B01J23/74; B01J23/745; B01D; B01D53/00; B01D53/34; B01D53/74; B01D53/86; B01D53/8621; B01D53/8625; B01D53/8628
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
85 words
A process for preparing an iron oxide catalyst comprising: a. adding iron carbonyl to an inert carrier gas, b. flowing the carbonyl containing carrier gas over a suitable support to deposit the carbonyl onto the support at a rate such that the temperature remains in the range of about 0° - 100°C for a period of time sufficient to saturate the support, and c. flowing an oxidizing gas over the support while maintaining the temperature below 100°C to oxidize the adsorbed carbonyl to iron oxide.
Claim 2
Dependent Claim
85 words
A process for preparing an iron oxide catalyst comprising: a. adding iron carbonyl to an inert carrier gas, b. flowing the carbonyl containing carrier gas over a suitable support to deposit the carbonyl onto the support at a rate such that the temperature remains in the range of about 0° - 100°C for a period of time sufficient to saturate the support, and c. flowing an oxidizing gas over the support while maintaining the temperature below 100°C to oxidize the adsorbed carbonyl to iron oxide.
Claim 3
Dependent Claim
12 words
The method of claim 1 wherein the iron carbonyl is iron pentacarbonyl.
Claim 4
Dependent Claim
18 words
The method of claim 1 wherein the vaporization temperature is in the range of about 20° - 50°C.
Claim 5
Dependent Claim
17 words
The method of claim 1 wherein the oxidation temperature is in the range of 30° - 100°C.
Claim 6
Dependent Claim
24 words
The method of claim 1 wherein the oxidizing gas is selected from mixtures of nitrogen and air, nitrogen and ozone, and nitrogen and oxygen.
Claim 7
Dependent Claim
21 words
The method of claim 1 wherein the support is selected from activated alumina, modified alumina, activated carbon, silica-alumina, and sodium aluminosilicate.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-01-18 | 1980-07-19 | 1981-01-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-01-18 | 1984-07-19 | 1985-01-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-01-18 | 1988-07-19 | 1989-01-18 | $7700.00 | Window Closed / Lapsed |