US5116800A
Expired / Lapsed
US
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High durability and exhuast catalyst with low hydrogen sulfide emissions
Assignee: Umicore Autocat USA Inc
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Filing: 1990-12-11
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Granted: 1992-05-26
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Expires: 2010-12-11
Abstract
Abstract This invention relates to a high durability catalyst for treating automotive exhaust gas which produces a minimal amount of hydrogen sulfide and is essentially free of cerium oxide and which comprises a support consisting substantially of delta alumina, an effective amount of a promoter consisting essentially of barium oxide and, optionally, lanthanum oxide, and, effective amounts of the noble metals palladium and rhodium deposited on the support. In an additional embodiment of the invention,m the support may contain delta alumina, and, optionally zirconia, and the catalyst may contain an overlayer containing delta or gamma alumina, and optionally, zirconia. Effective amounts of the noble metals palladium and rhodium may be deposited on the support and/or on the overlayer. In another aspect, the invention resides in a process for treating the exhaust gases from automotive engines to remove carbon monoxide, hydrocarbons, and nitrogen oxides, and to minimize the production of hydrogen sulfide.
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 15:16
CPC Classifications
B; B01; B01D; B01D53/00; B01D53/34; B01D53/92; B01D53/94; B01D53/9445; B01D53/945; B01J; B01J23/00; B01J23/38; B01J23/54; B01J23/56; B01J23/58; B01J23/63; Y; Y02; Y02A; Y02A50/00; Y02A50/20; Y02T; Y02T10/00; Y02T10/10; Y02T10/12
Claims Analysis
Total Claims: 23
Claim 1
Independent Claim
72 words
A high durability catalyst for treating automotive exhaust gas which produces a minimal, amount of hydrogen sulfide and is essentially free of cerium oxide and which consists essentially of: a) a support consisting substantially of delta alumina; b) an effective amount of a promoter consisting essentially of barium oxide and, optionally, lanthanum oxide deposited on the support; and, c) effective amounts of the noble metals palladium and rhodium deposited on the support.
Claim 2
Dependent Claim
72 words
A high durability catalyst for treating automotive exhaust gas which produces a minimal, amount of hydrogen sulfide and is essentially free of cerium oxide and which consists essentially of: a) a support consisting substantially of delta alumina; b) an effective amount of a promoter consisting essentially of barium oxide and, optionally, lanthanum oxide deposited on the support; and, c) effective amounts of the noble metals palladium and rhodium deposited on the support.
Claim 3
Dependent Claim
53 words
The catalyst of claim 1 wherein the catalyst contains about 15 to 30 wt. % alumina, about 0.3 to 6 wt. % barium, 0 to about 8 wt. % lanthanum, about 0.01 to 0.9 wt. % palladium, and about 0.005 to 0.3 wt. % rhodium based on the total weight of the catalyst.
Claim 4
Dependent Claim
16 words
The catalyst of claim 2 wherein the catalyst contains about 17 to 20 wt. % alumina.
Claim 5
Dependent Claim
16 words
The catalyst of claim 2 wherein the catalyst contains about 0.5 to 1.6 wt. % barium.
Claim 6
Dependent Claim
16 words
The catalyst of claim 2 wherein the catalyst contains about 1 to 3 wt. % lanthanum.
Claim 7
Dependent Claim
16 words
The catalyst of claim 2 wherein the catalyst contains about 0.05 to 0.5 wt. % palladium.
Claim 8
Dependent Claim
16 words
The catalyst of claim 2 wherein the catalyst contains about 0.007 to 0.06 wt. % rhodium.
Claim 9
Dependent Claim
90 words
A high durability catalyst for treating automotive exhaust gas which produces a minimal amount of hydrogen sulfide and is essentially free of cerium oxide and which comprises: a) a support consisting substantially of delta alumina, and, optionally, zirconia; b) an effective amount of a promoter consisting essentially of barium oxide and, optionally, lanthanum oxide deposited on the support; c) an overlayer consisting of alumina, and optionally, zirconia, deposited over the support; and, d) effective amounts of the noble metals palladium and rhodium deposited on the support and/or on the overlayer.
Claim 10
Dependent Claim
90 words
A high durability catalyst for treating automotive exhaust gas which produces a minimal amount of hydrogen sulfide and is essentially free of cerium oxide and which comprises: a) a support consisting substantially of delta alumina, and, optionally, zirconia; b) an effective amount of a promoter consisting essentially of barium oxide and, optionally, lanthanum oxide deposited on the support; c) an overlayer consisting of alumina, and optionally, zirconia, deposited over the support; and, d) effective amounts of the noble metals palladium and rhodium deposited on the support and/or on the overlayer.
Claim 11
Dependent Claim
12 words
The catalyst of claim 8 wherein the overlayer is substantially delta alumina.
Claim 12
Dependent Claim
14 words
The catalyst of claim 8 wherein the overlayer is substantially delta alumina and zirconia.
Claim 13
Dependent Claim
14 words
The catalyst of claim 8 wherein the overlayer is substantially gamma alumina and zirconia.
Claim 14
Dependent Claim
14 words
The catalyst of claim 8 wherein the noble metals are deposited on the support.
Claim 15
Dependent Claim
14 words
The catalyst of claim 8 wherein the noble metals are deposited on the overlayer.
Claim 16
Dependent Claim
18 words
The catalyst of claim 8 wherein the noble metals are deposited on the support and on the overlayer.
Claim 17
Dependent Claim
60 words
The catalyst of claim 8 wherein the catalyst contains about 15 to 30 wt. % alumina, about 0.3 to 6 wt. % barium, 0 to about 8 wt. % lanthanum, 0 to about 6 wt. % zirconia, about 0.01 to 0.9 wt. % palladium, and about 0.005 to 0.3 wt. % rhodium based on the total weight of the catalyst.
Claim 18
Dependent Claim
16 words
The catalyst of claim 15 wherein the catalyst contains about 17 to 20 wt. % alumina.
Claim 19
Dependent Claim
16 words
The catalyst of claim 15 wherein the catalyst contains about 0.5 to 1.6 wt. % barium.
Claim 20
Dependent Claim
16 words
The catalyst of claim 15 wherein the catalyst contains about 1 to 3 wt. % lanthanum.
Claim 21
Dependent Claim
16 words
The catalyst of claim 15 wherein the catalyst contains about 0.05 to 3 wt. % zirconia.
Claim 22
Dependent Claim
16 words
The catalyst of claim 15 wherein the catalyst contains about 0.05 to 0.5 wt. % palladium.
Claim 23
Dependent Claim
16 words
The catalyst of claim 15 wherein the catalyst contains about 0.007 to 0.06 wt. % rhodium.
References Cited (Backward Citations)
US4172047A
Cited
US4722920A
Cited
DE3713629A1
Cited
EP0262962A2
Cited
US4760044A
Cited
US4780447A
Cited
US4868148A
Cited
EP0358125A2
Cited
US4977129A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1995-05-26 | 1995-11-25 | 1996-05-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1999-05-26 | 1999-11-25 | 2000-05-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2003-05-26 | 2003-11-25 | 2004-05-26 | $7700.00 | Window Closed / Lapsed |