Reduced-emissions combustion utilizing multiple-component metallic combustion catalyst and lightly catalyzed diesel oxidation catalyst
First Claim
1. A method for reducing particulate emissions from a diesel engine while also controlling emissions of NO2 as a percent of exhaust total nitrogen oxides, comprising:
- adding a fuel borne catalyst comprising platinum and cerium and/or iron at a total metal concentration of from 2 to 15 ppm in the fuel to a diesel fuel; and
passing exhaust produced by the combustion through a diesel oxidation catalyst having substrate with a precious metal catalyst thereon, the catalyst be present on the substrate in an amount of less than 15 grams per cubic foot of substrate.
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Accused Products
Abstract
An improved diesel operation system employs a lightly diesel oxidation catalyst (DOC), preferably with a platinum containing fuel borne catalyst (FBC) in the fuel. The DOC is at least partially lightly catalyzed with precious metal catalyst, e.g., platinum group metal, having a metal loading of from about 3 to 15 grams per cubic foot to minimize formation of NO2 in the exhaust gas. Preferred fuel borne catalyst levels will be low, e.g., from 0.05 to 0.5 ppm for platinum and 3 to 8 ppm for cerium and/or iron, thereby providing effective engine out emissions reductions without discharging excessive amounts of metal catalysts or NO2 to the atmosphere.
35 Citations
4 Claims
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1. A method for reducing particulate emissions from a diesel engine while also controlling emissions of NO2 as a percent of exhaust total nitrogen oxides, comprising:
- adding a fuel borne catalyst comprising platinum and cerium and/or iron at a total metal concentration of from 2 to 15 ppm in the fuel to a diesel fuel; and
passing exhaust produced by the combustion through a diesel oxidation catalyst having substrate with a precious metal catalyst thereon, the catalyst be present on the substrate in an amount of less than 15 grams per cubic foot of substrate. - View Dependent Claims (2, 3, 4)
- adding a fuel borne catalyst comprising platinum and cerium and/or iron at a total metal concentration of from 2 to 15 ppm in the fuel to a diesel fuel; and
Specification