US5407880A
Expired / Lapsed
US
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Catalysts for adsorption of hydrocarbons
Assignee: Nissan Motor Co Ltd
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Filing: 1993-11-05
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Granted: 1995-04-18
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Expires: 2013-11-05
Abstract
Abstract A catalyst for the adsorption of hydrocarbons is used in an apparatus for the purification of exhaust gas from an internal engine and comprises a honeycomb monolith carrier, a first layer of at least one zeolite having a different crystalline structure, a second layer containing at least one of Pt and Pd as a catalytic component, and a third layer containing Rh as a catalytic component.
Inventors
- 👤 Takuya Ikeda
- 👤 Chiemi Hayashi
- 👤 Tetsuo Ito
- 👤 Koji Masuda
- 👤 Maki Kamikubo
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 05:44
CPC Classifications
B; B01; B01J; B01J37/00; B01J37/02; B01J37/024; B01J37/0246; B01D; B01D53/00; B01D53/34; B01D53/92; B01D53/94; B01D53/944; B01J29/00; B01J29/04; B01J29/06; B01J29/40; B01J29/42; B01J29/44; B01J29/46; B01J29/80; B01J37/0244; B01D2255/00; B01D2255/10; B01D2255/102; B01D2255/1023; B01D2255/1025; B01D2255/20; B01D2255/206; B01D2255/2065; B01D2255/207; B01D2255/20761; B01D2255/209; B01D2255/2092; B01D2255/50; B01D2255/504; B01D2255/90; B01D2255/902; B01D2255/9025; B01D2255/912; B01J2229/00; B01J2229/30; B01J2229/42; B01J29/08; B01J29/084; B01J29/70; B01J29/7007
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
82 words
A catalyst for the adsorption of hydrocarbons, comprising a honeycomb carrier, a first layer formed on the carrier and comprised of at least one zeolite having a different crystalline structure effective for the adsorption of hydrocarbon, a second layer formed on the first layer and containing at least one of Pt and Pd as a catalytic component in powder consisting essentially of activated ceria and/or alumina, and a third layer formed on the second layer and containing Rh as a catalytic component.
Claim 2
Dependent Claim
82 words
A catalyst for the adsorption of hydrocarbons, comprising a honeycomb carrier, a first layer formed on the carrier and comprised of at least one zeolite having a different crystalline structure effective for the adsorption of hydrocarbon, a second layer formed on the first layer and containing at least one of Pt and Pd as a catalytic component in powder consisting essentially of activated ceria and/or alumina, and a third layer formed on the second layer and containing Rh as a catalytic component.
Claim 3
Dependent Claim
27 words
The catalyst according to claim 1, wherein a mixed powder of ZSM-5 zeolite and at least one of mordenite, USY and β-zeolite is used as the zeolite.
Claim 4
Dependent Claim
29 words
The catalyst according to claim 1, wherein a mixed slurry of two or more ZMS-5 zeolites having different silica/alumina ratios is coated as the zeolite onto the honeycomb carrier.
Claim 5
Dependent Claim
35 words
The catalyst according to claim 3, wherein said mixed slurry is comprised of ZSM-5 zeolite having a silica/alumina ratio of more than 100 and ZSM-5 zeolite having a silica/alumina ratio of not more than 100.
References Cited (Backward Citations)
JPS5820307A
Cited
JPH01171625A
Cited
JPH02135126A
Cited
JPH0356139A
Cited
JPH04267950A
Cited
US5292696A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1998-04-17 | 1998-10-17 | 1999-04-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2002-04-17 | 2002-10-17 | 2003-04-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2006-04-17 | 2006-10-17 | 2007-04-18 | $7700.00 | Window Closed / Lapsed |