US4389382A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of using a simplified low cost catalyst system
Assignee: Ford Global Technologies LLC
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Filing: 1981-07-20
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Granted: 1983-06-21
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Expires: 2001-07-20
Abstract
Abstract There is disclosed a method of using an exhaust gas catalyst for treatment of exhaust gases developed by burning a hydrocarbon based fuel in an internal combustion engine. These exhaust gases contain varying amounts of unburned hydrocarbons, carbon monoxide and oxides of nitrogen depending upon the operating conditions of the internal combustion engine. This specification teaches use of an improved catalyst composition in which a support medium is provided for supporting the catalyst system, the support medium having an upstream support portion and a downstream support portion over which the exhaust gases pass in succession. The upstream support portion of the support medium has palladium deposited thereon and the downstream support portion of the support medium has tungsten deposited thereon. The catalyst system has particular utility as a three-way catalyst operating at approximately stoichiometric conditions or as a catalyst for use in conjunction with the fast burn engines or as an oxidation catalyst.
Inventors
- 👤 Haren S. Gandhi
- 👤 Karen M. Adams
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 02:07
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; B01J23/64; B01J23/652; B01J23/6527; Y; Y02; Y02T; Y02T10/00; Y02T10/10; Y02T10/12
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
149 words
In a process for treatment of exhaust gases from an internal combustion engine, the steps of: burning a hydrocarbon fuel or a fuel containing hydrocarbons and alcohol blends in the internal combustion engine thereby to generate exhaust gases from the internal combustion engine containing various amounts of unburned hydrocarbons, carbon monoxide, and oxides of nitrogen depending upon operating conditions of the internal combustion engine; and passing said generated exhaust gases over an improved catalyst, comprising: a support medium for supporting a catalyst system, said support medium having both an upstream support portion over which exhaust gases initially flow and a downstream support portion over which exhaust gases flow after passing over said upstream support portion thereof; palladium on said upstream support portion of said support medium; and tungsten on said downstream support portion of said support medium, said downstream support portion of said support medium being free of palladium.
Claim 2
Dependent Claim
149 words
In a process for treatment of exhaust gases from an internal combustion engine, the steps of: burning a hydrocarbon fuel or a fuel containing hydrocarbons and alcohol blends in the internal combustion engine thereby to generate exhaust gases from the internal combustion engine containing various amounts of unburned hydrocarbons, carbon monoxide, and oxides of nitrogen depending upon operating conditions of the internal combustion engine; and passing said generated exhaust gases over an improved catalyst, comprising: a support medium for supporting a catalyst system, said support medium having both an upstream support portion over which exhaust gases initially flow and a downstream support portion over which exhaust gases flow after passing over said upstream support portion thereof; palladium on said upstream support portion of said support medium; and tungsten on said downstream support portion of said support medium, said downstream support portion of said support medium being free of palladium.
Claim 3
Dependent Claim
154 words
In a process of treatment of exhaust gases from an internal combustion engine, the steps of: burning a hydrocarbon fuel or a fuel containing hydrocarbons and alcohol blends in the internal combustion engine thereby to generate exhaust gases from the internal combustion engine containing various amounts of unburned hydrocarbons, carbon monoxide, and oxides of nitrogen depending upon operating conditions of the internal combustion engine; and passing said generated exhaust gases over an improved catalyst, comprising: a support medium for supporting a catalyst system, said support medium having both an upstream support portion over which exhaust gases initially flow and a downstream support portion over which gases flow after passing over said upstream support portion thereof; finely divided palladium on said upstream support portion of said support medium; and finely divided tungsten on said downstream support portion of said support medium, said downstream support portion of said support medium being free of finely divided palladium.
Claim 4
Dependent Claim
154 words
In a process of treatment of exhaust gases from an internal combustion engine, the steps of: burning a hydrocarbon fuel or a fuel containing hydrocarbons and alcohol blends in the internal combustion engine thereby to generate exhaust gases from the internal combustion engine containing various amounts of unburned hydrocarbons, carbon monoxide, and oxides of nitrogen depending upon operating conditions of the internal combustion engine; and passing said generated exhaust gases over an improved catalyst, comprising: a support medium for supporting a catalyst system, said support medium having both an upstream support portion over which exhaust gases initially flow and a downstream support portion over which gases flow after passing over said upstream support portion thereof; finely divided palladium on said upstream support portion of said support medium; and finely divided tungsten on said downstream support portion of said support medium, said downstream support portion of said support medium being free of finely divided palladium.
Claim 5
Dependent Claim
18 words
The catalyst system of claim 1, in which the support media is a gamma alumina coated monolithic substrate.
Claim 6
Dependent Claim
18 words
The catalyst system of claim 2, in which the support media is a gamma alumina coated monolithic substrate.
Claim 7
Dependent Claim
15 words
The catalyst system of claim 1, in which the support media is gamma alumina pellets.
Claim 8
Dependent Claim
15 words
The catalyst system of claim 2, in which the support media is gamma alumina pellets.
Claim 9
Dependent Claim
16 words
The catalyst system of claim 1, in which the support media is a washcoated metallic substrate.
Claim 10
Dependent Claim
16 words
The catalyst system of claim 2, in which the support media is a washcoated metallic substrate.
Claim 11
Dependent Claim
183 words
In a process for treatment of exhaust gases from an internal combustion engine, the steps of: burning a hydrocarbon fuel or a fuel containing hydrocarbons and alcohol blends in the internal combustion engine thereby to generate exhaust gases from the internal combustion engine containing various amounts of unburned hydrocarbons, carbon monoxide, and oxides of nitrogen depending upon operating conditions of the internal combustion engine; and passing said generated exhaust gases over an improved catalyst, comprising: a support medium for supporting a catalyst system, said support medium having both an upstream support portion over which exhaust gases initially flow and a downstream support portion over which exhaust gases flow after passing over said upstream support portion thereof; 0.02 to 1.0% by weight of the upstream support portion of the substrate of finely divided palladium on said upstream portion of said support medium; and on said downstream support portion of said substrate, from 2 to 50 times the weight of palladium present on said upstream support portion of said substrate of finely divided tungsten, said downstream support portion of said substrate being free of palladium.
Claim 12
Dependent Claim
183 words
In a process for treatment of exhaust gases from an internal combustion engine, the steps of: burning a hydrocarbon fuel or a fuel containing hydrocarbons and alcohol blends in the internal combustion engine thereby to generate exhaust gases from the internal combustion engine containing various amounts of unburned hydrocarbons, carbon monoxide, and oxides of nitrogen depending upon operating conditions of the internal combustion engine; and passing said generated exhaust gases over an improved catalyst, comprising: a support medium for supporting a catalyst system, said support medium having both an upstream support portion over which exhaust gases initially flow and a downstream support portion over which exhaust gases flow after passing over said upstream support portion thereof; 0.02 to 1.0% by weight of the upstream support portion of the substrate of finely divided palladium on said upstream portion of said support medium; and on said downstream support portion of said substrate, from 2 to 50 times the weight of palladium present on said upstream support portion of said substrate of finely divided tungsten, said downstream support portion of said substrate being free of palladium.
Claim 13
Dependent Claim
21 words
The method of claim 9, in which the support media for the catalyst system is a gamma alumina coated monolithic substrate.
Claim 14
Dependent Claim
18 words
The method of claim 9, in which the support media for the catalyst system is gamma alumina pellets.
Claim 15
Dependent Claim
19 words
The method of claim 9, in which the support media for the catalyst system is a washcoated metallic substrate.
Claim 16
Dependent Claim
27 words
The method of claim 9, in which said finely divided tungsten of the catalyst system is present from 5 to 20 times the weight of palladium present.
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) | 1986-06-20 | 1986-12-20 | 1987-06-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-06-20 | 1990-12-20 | 1991-06-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-06-20 | 1994-12-20 | 1995-06-21 | $7700.00 | Window Closed / Lapsed |