US3909455A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Catalyst and process for making same
Assignee: Philip Morris USA Inc
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Filing: 1973-05-01
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Granted: 1975-09-30
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Expires: 1993-05-01
Abstract
Abstract A catalyst is provided which is remarkably effective for catalyzing the oxidation of carbon monoxide to carbon dioxide at ambient conditions. This catalyst is prepared by contacting high surface area alumina with a solution of a cobalt compound (e.g., cobalt nitrate), adsorbing the cobalt compound on the alumina, removing the solvent, and thereafter heating the cobalt-treated alumina at a temperature of 400*C to 1,300*C in an oxygenproviding environment.
Inventors
- 👤 Norman B Rainer
- 👤 Peter Allen Wilson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 07:08
CPC Classifications
A; A62; A62D; A62D9/00; B; B01; B01D; B01D53/00; B01D53/34; B01D53/74; B01D53/86; B01D53/864; B01J; B01J23/00; B01J23/005; B01J23/70; B01J23/74; B01J23/75; C; C01; C01B; C01B32/00; C01B32/50; B01J21/00; B01J21/02; B01J21/04; B01J35/00; B01J35/60; B01J35/61; B01J35/615; Y; Y02; Y02P; Y02P20/00; Y02P20/50; Y02P20/584
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
70 words
A ROOM TEMPERATURE CATALYST CAPABLE OF CONVERTING CARBON MONOXIDE TO CARBON DIOXIDE IN THE PRESENCE OF AMBIENT OXYGEN COMPRISING AN ALUMINA SUPPORT HAVING A SURFACE AREA OF ABOUT 100 TO ABOUT 400 SQUARE METERS PER GRAM AND FROM ABOUT 0.5 TO ABOUT 15 PERCENT BY WEIGHT COBALT ADSORBED ON SAID ALUMINA IN THE FORM OF A BLUE COBALT ALUMINATE SPINEL HAVING LABILE MOLECULAR OXYGEN, SAID CATALYST CONTAINING SUBSTANTIALLY NO MOISTURE.
Claim 2
Dependent Claim
70 words
A ROOM TEMPERATURE CATALYST CAPABLE OF CONVERTING CARBON MONOXIDE TO CARBON DIOXIDE IN THE PRESENCE OF AMBIENT OXYGEN COMPRISING AN ALUMINA SUPPORT HAVING A SURFACE AREA OF ABOUT 100 TO ABOUT 400 SQUARE METERS PER GRAM AND FROM ABOUT 0.5 TO ABOUT 15 PERCENT BY WEIGHT COBALT ADSORBED ON SAID ALUMINA IN THE FORM OF A BLUE COBALT ALUMINATE SPINEL HAVING LABILE MOLECULAR OXYGEN, SAID CATALYST CONTAINING SUBSTANTIALLY NO MOISTURE.
Claim 3
Dependent Claim
23 words
A catalyst as in claim 1 in the form of granular material having a mesh size of from about 4 to about 200.
Claim 4
Dependent Claim
19 words
A catalyst as in claim 1 where the alumina contains less than about 10 percent by weight of SiO2.
Claim 5
Dependent Claim
105 words
A process for the production of a catalyst which process comprises: a. contacting an alumina support having a surface area of from about 100 to about 400 square meters per gram with a solution of a cobaltous compound until from about 0.5 to about 15 weight percent cobalt has been deposited on said alumina, b. removing the solvent from said treated alumina, c. heating the resultant treated alumina in a stream of an oxygen-providing gas at a temperature of from about 400*C to about 1,300*C for at least 30 minutes, and d. cooling the resultant treated alumina in a substantially moisture-free atmosphere to room temperature.
Claim 6
Dependent Claim
105 words
A process for the production of a catalyst which process comprises: a. contacting an alumina support having a surface area of from about 100 to about 400 square meters per gram with a solution of a cobaltous compound until from about 0.5 to about 15 weight percent cobalt has been deposited on said alumina, b. removing the solvent from said treated alumina, c. heating the resultant treated alumina in a stream of an oxygen-providing gas at a temperature of from about 400*C to about 1,300*C for at least 30 minutes, and d. cooling the resultant treated alumina in a substantially moisture-free atmosphere to room temperature.
Claim 7
Dependent Claim
19 words
The process of claim 4 wherein said cobaltous compound solution is a solution of cobalt in an organic solvent.
Claim 8
Dependent Claim
21 words
The process of claim 4 wherein said oxygen-providing gas is selected from the group consisting of air, oxygen and nitrous oxide.
Claim 9
Dependent Claim
12 words
The process of claim 4 wherein said oxygen-providing gas is nitrous oxide.
Claim 10
Dependent Claim
21 words
The process of claim 4 wherein said treated alumina is heated at a temperature of from about 600*C to about 1,000*C.
Claim 11
Dependent Claim
21 words
The process of claim 5 wherein said treated alumina is heated at a temperature of from about 600*C to about 1,000*C.
Claim 12
Dependent Claim
17 words
The process of claim 9 wherein said solvent is acetone and said oxygen-providing atmosphere is nitrous oxide.
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) | 1978-09-29 | 1979-03-31 | 1979-09-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-09-29 | 1983-03-31 | 1983-09-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-09-29 | 1987-03-31 | 1987-09-30 | $7700.00 | Window Closed / Lapsed |