US3979337A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Catalyst for reducing nitrogen oxides
Assignee: Mitsui Kinzoku Co Ltd
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Filing: 1974-03-21
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Granted: 1976-09-07
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Expires: 1994-03-21
Abstract
Abstract A process for the preparation of a catalyst for reducing nitrogen oxides, which comprises impregnating a heat-resistant carrier with at least one carboxylate of the iron group metals and copper, converting the impregnated metallic carboxylate to the metallic hydroxide and then reducing the metallic hydroxide to the metal thereby preparing the catalyst; and catalysts prepared by said process.
Inventors
- 👤 Kazuhide Miyazaki
- 👤 Kiyomi Abe
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 05:57
CPC Classifications
B; B01; B01J; B01J23/00; B01J23/70; B01J23/74; B01D; B01D53/00; B01D53/34; B01D53/74; B01D53/86; B01D53/8621; B01D53/8625; B01D53/8628
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
79 words
A catalyst prepared by impregnating a heatresistant carrier with a solution of an aliphatic monocarboxylate or an aliphatic tricarboxylate of the metals (1) iron, (2) at least one of nickel and cobalt and (3) copper, converting the thus impregnated monocarboxylate or tricarboxylates of said metals to the corresponding metal hydroxides with an alkaline solution and reducing said metal hydroxides with a reducing gas to the corresponding metals, said metals being contained in the ratio by weight of 60-40:20-30:20-30 respectively.
Claim 2
Dependent Claim
79 words
A catalyst prepared by impregnating a heatresistant carrier with a solution of an aliphatic monocarboxylate or an aliphatic tricarboxylate of the metals (1) iron, (2) at least one of nickel and cobalt and (3) copper, converting the thus impregnated monocarboxylate or tricarboxylates of said metals to the corresponding metal hydroxides with an alkaline solution and reducing said metal hydroxides with a reducing gas to the corresponding metals, said metals being contained in the ratio by weight of 60-40:20-30:20-30 respectively.
Claim 3
Dependent Claim
15 words
A catalyst as claimed in claim 1, wherein the carrier is composed substantially of alumina.
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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) | 1979-09-07 | 1980-03-08 | 1980-09-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-09-07 | 1984-03-08 | 1984-09-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-09-07 | 1988-03-08 | 1988-09-07 | $7700.00 | Window Closed / Lapsed |