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US 7,028,468 B2Granted
Process for reducing pollutants from the exhaust of a diesel engine
AssigneeThe Lubrizol Corporation
InventorsKevin Francis Brown, Deborah Ann Langer, David Duncan
Life of this patent
Estimating the term…
Abstract
This invention relates to a process for reducing the level of pollutants in the exhaust of a diesel engine, comprising: operating said diesel engine using as the fuel a water-diesel fuel emulsion; and contacting the exhaust gas from said diesel engine with an oxidation catalyst.
Claims23
A process for reducing the level of pollutants in the exhaust of a diesel engine, comprising:
- combusting a stabilized water-diesel fuel emulsion in the engine, the combustion of the emulsion generating an exhaust gas, the exhaust gas comprising carbon monoxide, gaseous phase hydrocarbons and diesel particulate matter, and
- flowing the exhaust gas over an oxidation catalyst to oxidize the carbon monoxide, gaseous phase hydrocarbons and diesel particulate matter
- wherein the oxidation catalyst displays passive lean NOx catalytic activity and is in the form of a cellular monolith comprising a structure having parallel channels running through it and the process does not require supplemental addition of hydrocarbon to the exhaust gas.
A process for reducing the level of pollutants in the exhaust of a diesel engine, comprising:
- combusting a stabilized water-diesel fuel emulsion in the engine, the combustion of the emulsion generating an exhaust gas, the exhaust gas comprising carbon monoxide, gaseous phase hydrocarbons and diesel particulate matter;
- and
- flowing the exhaust over an oxidation catalyst to oxidize the carbon monoxide, gaseous phase hydrocarbons and diesel particulate matter, wherein said oxidation catalyst displays passive lean NOx catalytic activity and is comprised of a cellular monolith comprising parallel flow-through passages of ceramic or metal coated with a washcoat comprised of zeolite, Al2O3, SiO2, TiO2, CeO2, ZrO2, V2O5, La2O3, or mixtures of two or more thereof, said washcoat supporting a catalyst selected from the group consisting of Pt, Pd, Rh, Ir, Ru, V, Cr, Mn, Fe, Co, Ni, Cu, Zn, Ag, Ce, Ga, or a mixture of two or more thereof and the process does not require supplemental addition of hydrocarbon to the exhaust gas.
Dependencies are inferred from the claim text.