US4474739A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for removing gaseous pollutants in highly dilute concentrations from air at room temperatures
Assignee: TDY Industries LLC
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Filing: 1983-06-29
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Granted: 1984-10-02
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Expires: 2003-06-29
Abstract
Abstract Hydrogen sulfide and hydrogen cyanide are catalytically removed from air at room temperatures. Air containing H 2 S and HCN in dilute concentrations is contacted with a dry, activated catalyst formed of palladium (II) and copper (II) salts such as chlorides, on an alumina substrate, at a temperature in the range of -20° C. to 85° C. The catalyst may also contain nickel (II) chloride.
Inventors
- 👤 Victor F. Zackay
- 👤 William G. Lloyd
- 👤 Donald R. Rowe
- 👤 John M. Trenary
- 👤 Gerald T. Swanson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 22:53
CPC Classifications
B; B01; B01J; B01J27/00; B01J27/06; B01J27/08; B01J27/10; B01D; B01D53/00; B01D53/34; B01D53/74; B01D53/86; B01D53/8603; B01D53/8612; B01D53/8621
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
45 words
The method of removing the gases hydrogen sulfide or hydrogen cyanide and mixtures thereof from highly dilute concentrations in air, comprising contacting the gas and air mixture with a dry, activated catalyst comprising a palladium (II) salt and a copper (II) salt on a support.
Claim 2
Independent Claim
45 words
The method of removing the gases hydrogen sulfide or hydrogen cyanide and mixtures thereof from highly dilute concentrations in air, comprising contacting the gas and air mixture with a dry, activated catalyst comprising a palladium (II) salt and a copper (II) salt on a support.
Claim 3
Dependent Claim
13 words
The method defined in claim 1 wherein said support is an alumina support.
Claim 4
Dependent Claim
24 words
The method defined in claim 2 wherein said palladium salt is present in a concentration of about 0.03 gram-atoms palladium per kilogram of alumina.
Claim 5
Dependent Claim
30 words
The method of claim 1 wherein the gases and air mixture is contacted with the catalyst at a temperature in the range of about -20° C. to about +85° C.
Claim 6
Independent Claim
52 words
The method of oxidizing hydrogen sulfide to elemental sulfur and water comprising contacting gaseous hydrogen sulfide in air with a dry, activated oxidation catalyst comprising a water soluble palladium (II) salt and a copper (II) salt on an activated alumina support, at a temperature from about -20° C. to about 85° C.
Claim 7
Independent Claim
52 words
The method of oxidizing hydrogen sulfide to elemental sulfur and water comprising contacting gaseous hydrogen sulfide in air with a dry, activated oxidation catalyst comprising a water soluble palladium (II) salt and a copper (II) salt on an activated alumina support, at a temperature from about -20° C. to about 85° C.
Claim 8
Independent Claim
57 words
A method of oxidizing hydrogen cyanide to carbon dioxide, water and nitrogen oxides comprising contacting gaseous hydrogen cyanide in air with a dry, activated oxidation catalyst comprising a water soluble palladium salt (II) and a copper (II) salt on an activated alumina support, at a temperature in the range from about 0° C. to about 400° C.
Claim 9
Independent Claim
57 words
A method of oxidizing hydrogen cyanide to carbon dioxide, water and nitrogen oxides comprising contacting gaseous hydrogen cyanide in air with a dry, activated oxidation catalyst comprising a water soluble palladium salt (II) and a copper (II) salt on an activated alumina support, at a temperature in the range from about 0° C. to about 400° C.
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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) | 1987-10-02 | 1988-04-02 | 1988-10-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-10-02 | 1992-04-02 | 1992-10-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-10-02 | 1996-04-02 | 1996-10-02 | $7700.00 | Window Closed / Lapsed |