US5876680A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Bimetallic tungsten/platinum catalysts for lean-burn emissions
Assignee: Ford Global Technologies LLC
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Filing: 1996-06-12
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Granted: 1999-03-02
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Expires: 2016-06-12
Abstract
Abstract This invention is a bimetallic catalyst comprising tungsten oxide and platinum in critical amounts on a mostly γ-alumina support material. It is particularly optimal for use in lean-burn engine exhaust systems, including gasoline and diesel, where it efficiently reduces NOx in the exhaust gas.
Inventors
- 👤 Mohinder S. Chattha
- 👤 Robert J. Kudla
- 👤 T. E. Hoost
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 21:53
CPC Classifications
B; B01; B01D; B01D53/00; B01D53/34; B01D53/92; B01D53/94; B01D53/9445; B01D53/945; Y; Y02; Y02T; Y02T10/00; Y02T10/10; Y02T10/12
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
121 words
A process for the removal of nitrogen oxides, carbon monoxide, and hydrocarbons from exhaust gases generated by an internal combustion engine, said process comprising the steps of: exposing said exhaust gases under conditions effective for the removal of said nitrogen oxides, carbon monoxide, and hydrocarbons to a single-stage bimetallic catalyst in the exhaust gas system of an internal combustion engine operated under lean-burn conditions wherein the engine's air/fuel ratio is between about 19 to 40, said catalyst consisting essentially of: (a) porous support material comprising mostly γ-alumina; (b) 0.1 to 0.5 wt % tungsten oxide and 0.5 to 4 wt % platinum deposited on said support, the amount of said metals being individually based on the weight of said support material.
Claim 2
Dependent Claim
121 words
A process for the removal of nitrogen oxides, carbon monoxide, and hydrocarbons from exhaust gases generated by an internal combustion engine, said process comprising the steps of: exposing said exhaust gases under conditions effective for the removal of said nitrogen oxides, carbon monoxide, and hydrocarbons to a single-stage bimetallic catalyst in the exhaust gas system of an internal combustion engine operated under lean-burn conditions wherein the engine's air/fuel ratio is between about 19 to 40, said catalyst consisting essentially of: (a) porous support material comprising mostly γ-alumina; (b) 0.1 to 0.5 wt % tungsten oxide and 0.5 to 4 wt % platinum deposited on said support, the amount of said metals being individually based on the weight of said support material.
Claim 3
Dependent Claim
22 words
The process of claim 1 wherein said tungsten oxide comprises about 0.1-0.5 wt. % and the platinum comprises about 1.5-2.5 wt. %.
Claim 4
Dependent Claim
13 words
The process according to claim 1 wherein said support is substantially all γ-alumina.
Claim 5
Dependent Claim
29 words
The process according to claim 1 wherein said support comprises materials selected from the group consisting of cerium oxide, barium oxide, zirconium oxide, lanthanum oxide, titanium oxide, and alpha-alumina.
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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) | 2002-03-01 | 2002-08-31 | 2003-03-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2006-03-01 | 2006-08-31 | 2007-03-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2010-03-01 | 2010-08-31 | 2011-03-02 | $7700.00 | Window Closed / Lapsed |