US5487268A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Catalyst for purifying exhaust gas and method of purifying exhaust gas
Assignee: NE Chemcat Corp
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Filing: 1994-03-28
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Granted: 1996-01-30
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Expires: 2014-03-28
Abstract
Abstract A catalyst comprising an iridium supported on at least one carrier selected from the group consisting of metal carbides and metal nitrides for eliminating nitrogen oxides in exhaust gas in the presence of oxygen in excess of the stoichiometric quantity of oxidizing components for reducing components. The catalyst is effective for eliminating NO x in exhaust gas from lean burn engines such as lean burn gasoline engines and diesel engines containing excess O 2 corresponding to an A/F ratio of 17 or over.
Inventors
- 👤 Takashi Itoh
- 👤 Yukio Kosaki
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 19:28
CPC Classifications
B; B01; B01D; B01D53/00; B01D53/34; B01D53/92; B01D53/94; B01D53/9445; B01D53/945; B01D53/9404; B01D53/9409; B01D53/9413; B01D53/9418; B01J; B01J23/00; B01J23/38; B01J23/40; B01J23/46; B01J23/468; B01J27/00; B01J27/20; B01J27/22; B01J27/24; B01D2255/00; B01D2255/10; B01D2255/102; B01D2255/1028; B01D2255/20; B01D2255/207; B01D2255/20707; B01D2255/90; B01D2255/92; B01D2255/9207; B01D2258/00; B01D2258/01; B01D2258/012; F; F02; F02B; F02B1/00; F02B1/02; F02B1/04; F02B3/00; F02B3/06; Y; Y02; Y02A; Y02A50/00; Y02A50/20; Y02T; Y02T10/00; Y02T10/10; Y02T10/12
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
63 words
A method of purifying exhaust gas from a lean burn gasoline engine or diesel engine having an air/fuel ratio of 17 or over, comprising the step of bringing the catalyst comprising an iridium supported on one carrier selected from the group consisting of metal carbides and metal nitrides, into contact with said exhaust gas at a temperature of 250° C. to 850° C.
Claim 2
Independent Claim
63 words
A method of purifying exhaust gas from a lean burn gasoline engine or diesel engine having an air/fuel ratio of 17 or over, comprising the step of bringing the catalyst comprising an iridium supported on one carrier selected from the group consisting of metal carbides and metal nitrides, into contact with said exhaust gas at a temperature of 250° C. to 850° C.
Claim 3
Dependent Claim
20 words
A method as claimed in claim 1, wherein the gas space velocity of the exhaust gas is 5,000 to 200,000/hr.
References Cited (Backward Citations)
FR2201711A5
Cited
US3953363A
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US4039622A
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GB2000046A
Cited
US4492770A
Cited
US4372933A
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GB2163364A
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EP0399891A1
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US5155994A
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US5201802A
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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) | 1999-01-29 | 1999-07-31 | 2000-01-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2003-01-29 | 2003-07-31 | 2004-01-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2007-01-29 | 2007-07-31 | 2008-01-30 | $7700.00 | Window Closed / Lapsed |