US5643543A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Catalyst for treatment of exhaust gases from an internal combustion engine
Assignee: IFP Energies nouvelles
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Filing: 1995-01-31
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Granted: 1997-07-01
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Expires: 2015-01-31
Abstract
Abstract A catalyst for the treatment of exhaust gases from an internal combustion engine comprises a support including a porous layer which latter includes at least one inorganic refractory oxide and an active phase containing at least cerium, iron and platinum, characterized in that said porous layer comprises at least the following percentages by weight 0.3% to 4.4% of cerium; 0.1% to 3.5% of iron; and 0.0003% to 0.04% of platinum; and the complement to 100% being constituted by at least one inorganic refractory oxide. The catalyst can be used in the treatment of exhaust gases from compression ignition engines, in particular from commercial vehicles with an unladen weight of 3.5 metric tons or more.
Inventors
- 👤 Isabelle Guibard
- 👤 Daniel Durand
- 👤 Gil Mabilon
- 👤 Nicolas des Courtils
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 01:57
CPC Classifications
B; B01; B01D; B01D53/00; B01D53/34; B01D53/92; B01D53/94; B01D53/9445; B01D53/945; B01D53/944; B01J; B01J23/00; B01J23/70; B01J23/89; B01J23/8933; B01J23/894; Y; Y02; Y02A; Y02A50/00; Y02A50/20; Y02T; Y02T10/00; Y02T10/10; Y02T10/12
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
87 words
A method for the treatment of exhaust gases, comprising contacting exhaust gases from a compression ignition engine with a catalyst comprising a support including a porous layer of at least one inorganic refractory oxide and an active phase containing at least cerium, iron and platinum, wherein said porous layer comprises at least the following percentages by weight: 0.3% to 4.4% of cerium; 0.1% to 3.5% of iron; and 0.0003% to less than 0.04% of platinum, and the complement to 100% being at least one inorganic refractory oxide.
Claim 2
Independent Claim
87 words
A method for the treatment of exhaust gases, comprising contacting exhaust gases from a compression ignition engine with a catalyst comprising a support including a porous layer of at least one inorganic refractory oxide and an active phase containing at least cerium, iron and platinum, wherein said porous layer comprises at least the following percentages by weight: 0.3% to 4.4% of cerium; 0.1% to 3.5% of iron; and 0.0003% to less than 0.04% of platinum, and the complement to 100% being at least one inorganic refractory oxide.
Claim 3
Independent Claim
97 words
A method for the treatment of exhaust gases from compression ignition engines, comprising contacting said gases with a catalyst for the treatment of exhaust gases from an internal combustion engine, said catalyst comprising a support including a porous layer of at least one inorganic refractory oxide and an active phase containing at least cerium, iron and platinum, wherein said porous layer comprises at least the following percentages by weight: 0.3% to 4.4% of cerium; 0.1% to 3.5% of iron; and 0.0003% to 0.04% of platinum; and the complement to 100% being at least one inorganic refractory oxide.
Claim 4
Independent Claim
97 words
A method for the treatment of exhaust gases from compression ignition engines, comprising contacting said gases with a catalyst for the treatment of exhaust gases from an internal combustion engine, said catalyst comprising a support including a porous layer of at least one inorganic refractory oxide and an active phase containing at least cerium, iron and platinum, wherein said porous layer comprises at least the following percentages by weight: 0.3% to 4.4% of cerium; 0.1% to 3.5% of iron; and 0.0003% to 0.04% of platinum; and the complement to 100% being at least one inorganic refractory oxide.
Claim 5
Dependent Claim
41 words
A method according to claim 2, wherein said porous layer comprises, by weight: 0.3% to 4.4% of cerium; 0.1% to 2% of iron; and 0.0035% to 0.03% of platinum; and the complement to 100% being at least one inorganic refractory oxide.
Claim 6
Dependent Claim
37 words
A method according to claim 2, wherein the inorganic refractory oxide is alpha alumina, gamma alumina, delta alumina, eta alumina, theta alumina, kappa alumina, khi alumina, silica, an aliminosilicate, azeolite, titanium oxide, zirconia or a mixture thereof.
Claim 7
Dependent Claim
14 words
A method according to claim 2, wherein the porous layer is in particulate form.
Claim 8
Dependent Claim
18 words
A method according to claim 2, wherein the porous layer is deposited on a metallic or ceramic substrate.
Claim 9
Dependent Claim
15 words
A method according to claim 6, wherein said substrate is monolithic with a cellular structure.
Claim 10
Dependent Claim
23 words
A method according to claim 6, wherein said porous layer is present in a quantity of 20 to 200 g/l of said substrate.
Claim 11
Dependent Claim
26 words
A method according to claim 6, wherein the platinum content, expressed with respect to the total volume of said substrate, is between 0.0007 and 0.08 g/l.
Claim 12
Dependent Claim
28 words
A method according to claim 2, wherein the exhaust gases are from commercial vehicle compression ignition engines with a total unladen weight of 3.5 metric tons or more.
Claim 13
Dependent Claim
23 words
A method according to claim 6, wherein said porous layer is present in a quantity of 80 to 150 g/l of said substrate.
Claim 14
Dependent Claim
14 words
A method according to claim 5, wherein the porous layer is spherules or extrudates.
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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) | 2000-06-30 | 2000-12-30 | 2001-07-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2004-06-30 | 2004-12-30 | 2005-07-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2008-06-30 | 2008-12-30 | 2009-07-01 | $7700.00 | Window Closed / Lapsed |