US4303552A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Diesel exhaust catalyst
Assignee: WR Grace and Co Conn
•
Filing: 1980-05-27
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Granted: 1981-12-01
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Expires: 2000-05-27
Abstract
Abstract A catalyst which is particularly useful in the treatment of diesel exhaust emissions is described. The catalyst comprises a mixture of a supported noble metal and/or chromium component and a bulk first transition series, silver, and/or hafnium component. The supported component catalyzes hydrocarbon conversions and the bulk component catalyzes combustion of carbon particulates in diesel exhaust gases.
Inventors
- 👤 Michael V. Ernest
- 👤 William A. Welsh
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 19:00
CPC Classifications
B; B01; B01J; B01J23/00; B01J23/70; B01J23/89; B01J23/8933; B01J23/8993; B01D; B01D53/00; B01D53/34; B01D53/74; B01D53/86; B01D53/92; B01D53/94; B01D53/944; B01J23/16; B01J23/24; B01J23/26; B01J23/38; B01J23/54; B01J23/56; B01J23/64; B01J23/652; B01J23/6522; B01J23/76; B01J23/84; B01J23/85; B01J23/86; B01J23/868; B01J37/00; B01J37/04; F; F01; F01N; F01N3/00; F01N3/02; F01N3/021; F01N3/033; F01N3/035; F02; F02B; F02B3/00; F02B3/06
Claims Analysis
Total Claims: 26
Claim 1
Independent Claim
62 words
A composition comprising a mixture of catalytically-effective amounts of a supported material comprising a noble metal and chromium or catalytically-active compounds thereof, said material supported on a porous refractory inorganic oxide, and at least one bulk material selected from the group consisting of an element of the first transition series, silver, hafnium, and catalytically-active compounds thereof, said mixture deposited on a substrate.
Claim 2
Dependent Claim
62 words
A composition comprising a mixture of catalytically-effective amounts of a supported material comprising a noble metal and chromium or catalytically-active compounds thereof, said material supported on a porous refractory inorganic oxide, and at least one bulk material selected from the group consisting of an element of the first transition series, silver, hafnium, and catalytically-active compounds thereof, said mixture deposited on a substrate.
Claim 3
Dependent Claim
14 words
The composition of claim 1 in which the inorganic oxide comprises alumina or zirconia.
Claim 4
Dependent Claim
15 words
The composition of claim 1 in which the nobile metal comprises a platinum group metal.
Claim 5
Dependent Claim
17 words
The composition of claim 1 in which the supported material comprises a nobile metal and chromium oxide.
Claim 6
Dependent Claim
16 words
The composition of claim 1 in which the noble metal comprises platinum, palladium, or mixtures thereof.
Claim 7
Dependent Claim
20 words
The composition of claim 1 in which the supported material comprises platinum and chromium oxide supported on a transitional alumina.
Claim 8
Dependent Claim
13 words
The composition of claim 6 in which the transitional alumina comprises gamma alumina.
Claim 9
Dependent Claim
23 words
The composition of claim 1 in which the supported material comprises from about 25 to about 75 percent by weight of the mixture.
Claim 10
Dependent Claim
23 words
The composition of claim 1 in which the supported material comprises from about 40 to about 60 percent by weight of the mixture.
Claim 11
Dependent Claim
16 words
The composition of claim 1 in which the bulk material comprises copper oxide or chromium oxide.
Claim 12
Dependent Claim
13 words
The composition of claim 1 in which the bulk material comprises copper oxide.
Claim 13
Dependent Claim
15 words
The composition of claim 1 in which the bulk material comprises a mixed metal oxide.
Claim 14
Dependent Claim
23 words
The composition of claim 1 in which the bulk material has a surface area of less than about 10 square meters per gram.
Claim 15
Dependent Claim
24 words
The composition of claim 1 in which the bulk material has a surface area of not greater than about 1 square meter per gram.
Claim 16
Dependent Claim
16 words
The composition of claim 1 in which the bulk material has essentially no water pore volume.
Claim 17
Dependent Claim
23 words
The composition of claim 1 in which the bulk material comprises from about 25 to about 75 percent by weight of the mixture.
Claim 18
Dependent Claim
23 words
The composition of claim 1 in which the bulk material comprises from about 40 to about 60 percent by weight of the mixture.
Claim 19
Dependent Claim
21 words
The composition of claim 1 in which the substrate comprises a ceramic or metal material capable of trapping diesel exhaust particulates.
Claim 20
Dependent Claim
21 words
The composition of claim 1 in which the substrate comprises a ceramic monolithic structure, a ceramic foam, or a wire mesh.
Claim 21
Dependent Claim
64 words
A diesel exhaust catalyst comprising a mixture of from about 40 to 60 weight percent of a supported material comprising a platinum group metal and chromium oxide, supported on a transitional alumina and from about 40 to 60 weight percent of a bulk material comprising copper oxide, said mixture deposited on a substrate comprising a ceramic monolith, a ceramic foam, or a wire mesh.
Claim 22
Dependent Claim
64 words
A diesel exhaust catalyst comprising a mixture of from about 40 to 60 weight percent of a supported material comprising a platinum group metal and chromium oxide, supported on a transitional alumina and from about 40 to 60 weight percent of a bulk material comprising copper oxide, said mixture deposited on a substrate comprising a ceramic monolith, a ceramic foam, or a wire mesh.
Claim 23
Dependent Claim
17 words
The catalyst of claim 20 in which the platinum group metal comprises platinum, palladium, or mixtures thereof.
Claim 24
Dependent Claim
36 words
The catalyst of claim 21 in which the supported material comprises from about 0.5 to about 10 weight percent platinum, from about 5 to about 25 weight percent chromium oxide, and the balance the transitional alumina.
Claim 25
Dependent Claim
34 words
The composition of claim 1 which is prepared by combining a slurry of the supported material and a slurry of the bulk material, depositing the combined slurry on the substrate, and drying the substrate.
Claim 26
Dependent Claim
34 words
The catalyst of claim 20 which is prepared by combining a slurry of the supported material and a slurry of the bulk material, depositing the combined slurry on the substrate, and drying the substrate.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1984-11-30 | 1985-06-01 | 1985-12-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-11-30 | 1989-06-01 | 1989-12-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-11-30 | 1993-06-01 | 1993-12-01 | $7700.00 | Window Closed / Lapsed |