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US4996180A
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Catalyst of copper oxide and ceria
Assignee: Johnson Matthey PLC
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Filing: 1988-12-08
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Granted: 1991-02-26
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Expires: 2008-12-08
Abstract
Abstract Catalysts, particularly for combating air pollution from the exhaust gases of internal combustion engines, consist essentially of an intimate mixture of copper oxide and ceria, the weight of the copper oxide being less than the weight of the ceria.
Inventors
- 👤 Alan F. Diwell
- 👤 Christopher Hallett
- 👤 Graham Ansell
- 👤 John W. Hayes
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 22:17
CPC Classifications
B; B01; B01J; B01J37/00; B01J37/02; B01J37/0201; B01D; B01D53/00; B01D53/34; B01D53/92; B01D53/94; B01D53/9445; B01D53/945; B01J23/00; B01J23/70; B01J23/76; B01J23/83; B01J35/00; B01J35/60; B01J35/61; B01J35/612; B01J37/03; B01J37/031; B01J37/08; B01D2255/00; B01D2255/20; B01D2255/206; B01D2255/2063; B01D2255/2065; B01D2255/207; B01D2255/20761; B01D2255/209; B01D2255/2092; Y; Y02; Y02T; Y02T10/00; Y02T10/10; Y02T10/12
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
54 words
A catalyst for use in a method of treating gaseous effluents in order to combat air pollution by contacting the gaseous effluents with the catalyst, in which the catalyst consists essentially of an intimate mixture of copper oxide and ceria, the weight of the copper oxide being less than the weight of the ceria.
Claim 2
Dependent Claim
54 words
A catalyst for use in a method of treating gaseous effluents in order to combat air pollution by contacting the gaseous effluents with the catalyst, in which the catalyst consists essentially of an intimate mixture of copper oxide and ceria, the weight of the copper oxide being less than the weight of the ceria.
Claim 3
Dependent Claim
21 words
The catalyst according to claim 1, wherein the gaseous effluents to be treated are the exhaust gases of internal combustion engines.
Claim 4
Dependent Claim
77 words
A catalyst for use in a method of combating the pollution of air by the exhaust emissions from internal combustion engines by contacting the emissions with the catalyst at elevated temperature, to convert nitric oxide, carbon monoxide and hydrocarbons in the emissions to nitrogen, carbon dioxide and water, in which the catalyst consists essentially of an intimate mixture of copper oxide and ceria, the weight of the copper oxide being less than the weight of the ceria.
Claim 5
Dependent Claim
77 words
A catalyst for use in a method of combating the pollution of air by the exhaust emissions from internal combustion engines by contacting the emissions with the catalyst at elevated temperature, to convert nitric oxide, carbon monoxide and hydrocarbons in the emissions to nitrogen, carbon dioxide and water, in which the catalyst consists essentially of an intimate mixture of copper oxide and ceria, the weight of the copper oxide being less than the weight of the ceria.
Claim 6
Dependent Claim
21 words
The catalyst according to claim 2, wherein the surface area of the catalyst is at least 4m 2 g -1 .
Claim 7
Dependent Claim
21 words
The catalyst according to claim 2, wherein the surface area of the catalyst is at least 20m 2 g -1 .
Claim 8
Dependent Claim
23 words
The catalyst according to claim 2, wherein the proportion of copper oxide (measured as copper) to ceria is 0.1 to 10 weight percent.
Claim 9
Dependent Claim
34 words
The catalyst according to claim 2, wherein the catalyst also contains other rare earth metal oxide in a proportion (measured as metal) of up to 10 weight percent of the ceria (measured as cerium).
Claim 10
Dependent Claim
64 words
A catalyst for use with an internal combustion engine whose exhaust apparatus contains a catalyst to convert nitric oxide, carbon monoxide and hydrocarbons in the exhaust emissions of the engine to nitrogen, carbon dioxide and water, wherein the catalyst consists essentially of an intimate mixture of copper oxide and ceria, the weight of the copper oxide being less than the weight of the ceria.
Claim 11
Dependent Claim
64 words
A catalyst for use with an internal combustion engine whose exhaust apparatus contains a catalyst to convert nitric oxide, carbon monoxide and hydrocarbons in the exhaust emissions of the engine to nitrogen, carbon dioxide and water, wherein the catalyst consists essentially of an intimate mixture of copper oxide and ceria, the weight of the copper oxide being less than the weight of the ceria.
Claim 12
Dependent Claim
21 words
The catalyst according to claim 8, wherein the catalyst has a surface area of at least 4m 2 g -1 .
Claim 13
Dependent Claim
21 words
The catalyst according to claim 8, wherein the catalyst has a surface area of at least 20m 2 g -1 .
Claim 14
Dependent Claim
23 words
The catalyst according to claim 8, wherein the proportion of copper oxide (measured as copper) to ceria is 0.1 to 10 weight percent.
Claim 15
Dependent Claim
34 words
The catalyst according to claim 8, wherein the catalyst also contains other rare earth metal oxide in a proportion (measured as metal) of up to 10 weight percent of the ceria (measured as cerium).
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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) | 1994-02-25 | 1994-08-27 | 1995-02-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-02-25 | 1998-08-27 | 1999-02-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-02-25 | 2002-08-27 | 2003-02-26 | $7700.00 | Window Closed / Lapsed |