US3945947A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Catalyst for purifying exhaust gases
Assignee: Mitsui Kinzoku Co Ltd
•
Filing: 1973-01-08
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Granted: 1976-03-23
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Expires: 1993-01-08
Abstract
Abstract A multi-component catalyst composition prepared by combining (A) noble metal catalyst elements effective for oxidizing carbon monoxide and hydrocarbons with (B) catalyst elements effective for the same purpose but containing no noble metal. The multi-component catalyst composition is effective in purifying exhaust gases containing nitrogen oxides, carbon monoxide and hydrocarbons by converting these harmful components into harmless components.
Inventors
- 👤 Toshiyuki Sakai
- 👤 Kazuhide Miyazaki
- 👤 Michiaki Yamamoto
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 22:59
CPC Classifications
B; B01; B01D; B01D53/00; B01D53/34; B01D53/92; B01D53/94; B01D53/9445; B01D53/945; Y; Y02; Y02T; Y02T10/00; Y02T10/10; Y02T10/12
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
115 words
A single catalyst bed for purifying exhaust gases from combustion operations by transforming CO, hydrocarbons and nitrogen oxides into harmless substances, consisting essentially of two catalyst components A and B, wherein component A consists essentially of at least one metal selected from the group consisting of Pd and Pt, said metal being supported on an inert catalyst carrier, and component B consists essentially of 5 to 10 parts by weight of Mn 2 O 3 , 10 to 20 parts by weight of CuO, 5 to 10 parts by weight of Fe 2 O 3 , 60 to 80 parts by weight of gamma aluminum oxide and 1 to 5 parts by weight of MgO.
Claim 2
Dependent Claim
115 words
A single catalyst bed for purifying exhaust gases from combustion operations by transforming CO, hydrocarbons and nitrogen oxides into harmless substances, consisting essentially of two catalyst components A and B, wherein component A consists essentially of at least one metal selected from the group consisting of Pd and Pt, said metal being supported on an inert catalyst carrier, and component B consists essentially of 5 to 10 parts by weight of Mn 2 O 3 , 10 to 20 parts by weight of CuO, 5 to 10 parts by weight of Fe 2 O 3 , 60 to 80 parts by weight of gamma aluminum oxide and 1 to 5 parts by weight of MgO.
Claim 3
Dependent Claim
27 words
A single catalyst bed as claimed in claim 1 in which the volumetric ratio of component A: component B is in the range of 1:9 to 1:1.
References Cited (Backward Citations)
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US3397154A
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US3304150A
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US3493325A
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US3565574A
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US3637344A
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US3699683A
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US3784675A
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US3741725A
Cited
US3767764A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-03-23 | 1979-09-22 | 1980-03-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-03-23 | 1983-09-22 | 1984-03-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-03-23 | 1987-09-22 | 1988-03-23 | $7700.00 | Window Closed / Lapsed |