Claims
- 1. 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 composition in which a support medium for supporting a catalyst system had deposits thereon consisting essentially of:
- palladium; and
- finely divided tungsten, said tungsten being present on said support medium in quantities such that tungsten is available to substantially all of said palladium on the support medium so that said palladium/tungsten combination is effective in the catalytic oxidation of unburned hydrocarbons and carbon monoxide and the catalytic reduction of oxides of nitrogen without significant production of ammonia when the internal combustion engine is operating under fuel rich conditions.
- 2. 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 composition in which a support medium for supporting a catalyst system had deposits thereon consisting essentially of:
- finely divided palladium; and
- finely divided tungsten, said tungsten being present on the said catalyst support medium in a quantity such that tungsten is available to substantially all of said finely divided palladium on the catalyst support medium so that said palladium/tungsten combination is particularly effective in the catalytic oxidation of unburned hydrocarbons and carbon monoxide and the catalytic reduction of oxides of nitrogen without significant production of ammonia when the internal combustion engine is operating under fuel rich conditions.
- 3. The process of claim 1 or claim 2, in which the support media is a gamma alumina coated monolithic substrate.
- 4. The process of claim 1 or claim 2, in which the support media is gamma alumina pellets.
- 5. The process of claim 1 or claim 2, in which the support media is a washcoated metallic substrate.
- 6. 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 composition in which a support medium for supporting a catalyst system had deposits thereon consisting essentially of:
- 0.02 to 1.0% by weight of the substrate of finely divided palladium; and
- from 2 to 50 times the weight of palladium present of finely divided tungsten, said tungsten being present on the said catalyst support medium in a quantity such that tungsten is available to substantially all of said finely divided palladium on the catalyst support medium so that said palladium/tungsten combination is particularly effective in the catalytic oxidation of unburned hydrocarbons and carbon monoxide and the catalytic reduction of oxides of nitrogen without significant production of ammonia when the internal combustion engine is operating under fuel rich conditions.
- 7. The process of claim 6, in which the support media is a gamma alumina coated monolithic substrate.
- 8. The process of claim 6, in which the support media is gamma alumina pellets.
- 9. The process of claim 6, in which the support media is a washcoated metallic substrate.
- 10. The process of claim 6, in which said finely divided tungsten is present from 5 to 20 times the weight of palladium present.
- 11. 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 composition in which a support medium for supporting a catalyst system had deposits thereon consisting essentially of:
- a presynthesized PdWO.sub.x (x goes from 1 to 3), said presynthesized palladium/tungsten compound being effective in the catalytic oxidation of unburned hydrocarbons and carbon monoxide and the catalytic reduction of oxides of nitrogen without significant production of ammonia when the internal combustion engine is operating under fuel rich conditions.
- 12. The process of claim 11, in which the support media is a gamma alumina coated monolithic substrate.
- 13. The process of claim 11, in which the support media is gamma alumina pellets.
- 14. The process of claim 11, in which the support media is a washcoated metallic substrate.
Parent Case Info
This is a continuation of application Ser. No. 284,759, filed July 20, 1981, and now abandoned.
US Referenced Citations (2)
Number |
Name |
Date |
Kind |
4171287 |
Keith |
Oct 1979 |
|
4233188 |
Gandhi et al. |
Nov 1980 |
|
Continuations (1)
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Number |
Date |
Country |
Parent |
284759 |
Jul 1981 |
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