US3758666A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Removal of carbon monoxide from air
Assignee: Dow Chemical Co
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Filing: 1971-01-14
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Granted: 1973-09-11
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Expires: 1991-01-14
Abstract
Abstract Air containing carbon monoxide is contacted with a palladium catalyst under ambient conditions. It is believed that carbon monoxide removal is achieved by initial adsorption and subsequent oxidation to carbon dioxide on the catalyst surface. When the catalyst loses its effectiveness, it has been further discovered that simply reducing the pressure on the catalyst restores lost activity. The catalyst may also be reactivated by purging with a gas and heating.
Inventors
- 👤 L Frevel
- 👤 L Kressley
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 10:13
CPC Classifications
B; B01; B01D; B01D53/00; B01D53/34; B01D53/46; B01D53/62; B01J; B01J23/00; B01J23/38; B01J23/40; B01J23/44; B01J23/90; B01J23/96; Y; Y02; Y02A; Y02A50/00; Y02A50/20; Y10; Y10S; Y10S502/00; Y10S502/515; Y10S502/518
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
26 words
A method as in claim 1 wherein the contacting is carried out by flowing the air through a bed of the palladium-based catalyst at ambient temperature.
Claim 2
Dependent Claim
26 words
A method as in claim 2 wherein the palladium-based catalyst comprises colloidally dispersed palladium or an alloy thereof, supported upon an essentially nonhydrophilic inert catalyst support.
Claim 3
Dependent Claim
35 words
A method as in claim 3 wherein the palladium catalyst comprises from about 0.05 to about 5 weight percent of palladium or an alloy thereof with Group IB metals colloidally dispersed on a nonhydrophilic support.
Claim 4
Dependent Claim
45 words
A method as in claim 2 wherein the palladium-based catalyst comprises from about 0.15 to about 1.5 weight percent of colloidally dispersed palladium, or an alloy thereof, on diatomaceous earth, kappa alumina or alpha alumina or a mixture of two or more of the foregoing.
Claim 5
Dependent Claim
19 words
A method as in claim 1 wherein the palladium-based catalyst has a porosity of at least about 25 percent.
Claim 6
Dependent Claim
27 words
A method as in claim 1 wherein the active metal component of the palladium-based catalyst comprises at least about 95% Pd and up to about 5% Ag.
Claim 7
Dependent Claim
19 words
A method as in claim 1 wherein the pressure reduction is to less than about 15 millimeters of mercury.
Claim 8
Dependent Claim
19 words
A method as in claim 1 wherein the ambient temperature is within the range of about 0* to 35*C.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-09-10 | 1977-03-12 | 1977-09-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-09-10 | 1981-03-12 | 1981-09-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-09-10 | 1985-03-12 | 1985-09-11 | $7700.00 | Window Closed / Lapsed |