US5041407A
Expired / Lapsed
US
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High-temperature three-way catalyst for treating automotive exhaust gases
Assignee: Umicore Autocat USA Inc
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Filing: 1989-12-14
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Granted: 1991-08-20
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Expires: 2009-12-14
Abstract
Abstract A three-way catalyst for use in treating automotive exhaust gases employs a delta alumina support which contains oxides of cerium plus barium and/or lanthanum, plus at least one Group VIII noble metal from the group consisting of platinum, palladium, rhodium, ruthenium and iridium.
Inventors
- 👤 W. Burton Williamson
- 👤 Douglas G. Linden
- 👤 II Jack C. Summers
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 10:44
CPC Classifications
B; B01; B01J; B01J23/00; B01J23/38; B01J23/54; B01J23/56; B01J23/63; B01D; B01D53/00; B01D53/34; B01D53/92; B01D53/94; B01D53/9445; B01D53/945; B01J23/58; Y; Y02; Y02T; Y02T10/00; Y02T10/10; Y02T10/12
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
66 words
A three-way catalyst for use in treating automotive exhaust gases consisting essentially of: (a) an alumina support consisting substantially of delta-alumina; (b) effective amounts of the oxides of cerium plus barium deposited on the delta-alumina support of (a); (c) effective amounts of at least one Group VIII metal selected from the group consisting of platinum, palladium, rhodium, ruthenium, and iridium deposited on the support of (b).
Claim 2
Dependent Claim
66 words
A three-way catalyst for use in treating automotive exhaust gases consisting essentially of: (a) an alumina support consisting substantially of delta-alumina; (b) effective amounts of the oxides of cerium plus barium deposited on the delta-alumina support of (a); (c) effective amounts of at least one Group VIII metal selected from the group consisting of platinum, palladium, rhodium, ruthenium, and iridium deposited on the support of (b).
Claim 3
Dependent Claim
9 words
The three-way catalyst of claim 1 further including lanthanum.
Claim 4
Dependent Claim
15 words
The three-way catalyst of claim 1 wherein the alumina support contains about 30-80 wt.% delta-alumina.
Claim 5
Dependent Claim
46 words
The three-way catalyst of claim 1 wherein the amount of barium is about 0.3 to 3 wt.%, the amount of cerium is about 1.5 to 15 wt.%, and the amount of lanthanum is about 1 to 10 wt.%, based on the total weight of the catalyst.
Claim 6
Dependent Claim
28 words
The three-way catalyst of claim 1 wherein the amount of the Group VIII metals is about 0.05 to 5 wt.% based on the total weight of the catalyst.
Claim 7
Dependent Claim
76 words
A three-way catalyst for use in treating automotive exhaust gases consisting essentially of: (a) an alumina support consisting substantially of delta-alumina; (b) effective amounts of the oxides of cerium and lanthanum deposited on the delta-alumina support of (a) wherein the atomic ratio of cerium to lanthanum is 4/1; (c) effective amounts of at least one Group VIII metal selected from the group consisting of platinum, palladium, rhodium, ruthenium, and iridum deposited on the support of (b).
Claim 8
Dependent Claim
76 words
A three-way catalyst for use in treating automotive exhaust gases consisting essentially of: (a) an alumina support consisting substantially of delta-alumina; (b) effective amounts of the oxides of cerium and lanthanum deposited on the delta-alumina support of (a) wherein the atomic ratio of cerium to lanthanum is 4/1; (c) effective amounts of at least one Group VIII metal selected from the group consisting of platinum, palladium, rhodium, ruthenium, and iridum deposited on the support of (b).
Claim 9
Dependent Claim
16 words
The three-way catalyst of claim 2 wherein the alumina support contains about 30-80 wt.% delta alumina.
Claim 10
Dependent Claim
16 words
The three-way catalyst of claim 6 wherein the alumina support contains about 30-80 wt.% delta alumina.
Claim 11
Dependent Claim
45 words
The three-way catalyst of claim 6 wherein the amount of barium is about 0.3 to 3 wt.%, the amount of cerium is about 1.5 to 15 wt.%, and the amount of lanthanum is about 1 to 10 wt.% based on the total weight of catalyst.
Claim 12
Dependent Claim
28 words
The three-way catalyst of claim 2 wherein the amount of the Group VIII metals is about 0.05 to 5 wt.% based on the total weight of the catalyst.
Claim 13
Dependent Claim
29 words
The three-way catalyst of claim 6 wherein the amount of the Group VIII metals is about pb 0.05 to 5 wt.% based on the total weight of the catalyst.
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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) | 1994-08-19 | 1995-02-18 | 1995-08-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-08-19 | 1999-02-18 | 1999-08-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-08-19 | 2003-02-18 | 2003-08-20 | $7700.00 | Window Closed / Lapsed |