US5047378A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Exhaust gas-purifying catalyst and process for purifying exhaust gases
Assignee: Mitsubishi Power Ltd
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Filing: 1989-10-17
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Granted: 1991-09-10
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Expires: 2009-10-17
Abstract
Abstract An exhaust gas-purifying catalyst capable of carrying out the CO-oxidizing reaction and the reduction reaction of NO x with NH 3 in the same reactor and with good efficiency, and a process for purifying exhaust gases using the catalyst are provided, which catalyst comprises Cu and/or Co supported by Zr oxide or Ti oxide mixed with a Cu-substituted type zeolite.
Inventors
- 👤 Yasuyoshi Kato
- 👤 Nobue Teshima
- 👤 Kunihiko Konishi
- 👤 Toshiaki Matsuda
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 19:07
CPC Classifications
B; B01; B01D; B01D53/00; B01D53/34; B01D53/74; B01D53/86; B01D53/8643; B01D53/8646; B01D53/865; B01J; B01J29/00; B01J29/04; B01J29/06; B01J29/064; B01J29/072; B01J37/00; B01J37/04
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
79 words
An exhaust gas-purifying catalyst for reducing nitrogen oxides and oxidizing carbon monoxide, comprising: a first component including copper and/or cobalt supported by zirconium oxide or titanium oxide, an atomic ratio of said copper and/or cobalt to said zirconium oxide or titanium oxide being in the range of 20/80 to 1/99; and a second component including a copper-substituted type zeolite, a proportion by weight of said first component to said second component being in the range of 5/95 to 50/50.
Claim 2
Dependent Claim
79 words
An exhaust gas-purifying catalyst for reducing nitrogen oxides and oxidizing carbon monoxide, comprising: a first component including copper and/or cobalt supported by zirconium oxide or titanium oxide, an atomic ratio of said copper and/or cobalt to said zirconium oxide or titanium oxide being in the range of 20/80 to 1/99; and a second component including a copper-substituted type zeolite, a proportion by weight of said first component to said second component being in the range of 5/95 to 50/50.
Claim 3
Dependent Claim
70 words
An exhaust gas-purifying catalyst for reducing nitrogen oxides and oxidizing carbon monoxide according to claim 1, wherein said first component including copper and/or cobalt supported by zirconium oxide or titanium oxide is prepared bu kneading salts of Cu and/or Co together with zirconium hydroxide, metatitanic acid or zirconium oxide, or by coprecipitating from a mixed solution of a salts of Cu and/or Co with a soluble zirconium or titanium salt.
Claim 4
Dependent Claim
47 words
An exhaust gas-purifying catalyst for reducing nitrogen oxides and oxidizing carbon monoxide according to claim 1, wherein said second component including copper-substituted type zeolite is prepared by immersing powder of hydrogen type zeolite in a copper salt aqueous solution, or by kneading it together with the solution.
Claim 5
Dependent Claim
33 words
An exhaust gas-purifying catalyst for reducing nitrogen oxides and oxidizing carbon monoxide according to claim 1, wherein said first component and said second component are in a physically mixed state in the catalyst.
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JPS60232249A
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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) | 1994-09-09 | 1995-03-11 | 1995-09-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-09-09 | 1999-03-11 | 1999-09-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-09-09 | 2003-03-11 | 2003-09-10 | $7700.00 | Window Closed / Lapsed |