GASOLINE ENGINE EMISSIONS TREATMENT SYSTEMS HAVING PARTICULATE TRAPS
First Claim
1. An emission treatment system downstream of a gasoline direct injection engine for treatment of an exhaust system comprising hydrocarbons, carbon monoxide, nitrogen oxides, and particulates, the emission treatment system comprising a catalyzed particulate trap comprising a three-way conversion (TWC) catalyst coated onto or within a particulate trap.
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Accused Products
Abstract
Provided are exhaust systems and components suitable for use in conjunction with gasoline direct injection (GDI) engines to capture particulates in addition to reducing gaseous emission such as hydrocarbons, nitrogen oxides, and carbon monoxides. Exhaust treatment systems comprising a three-way conversion (TWC) catalyst located on a particulate trap are provided. An exemplary particulate trap is a soot filter. Additional treatment components can be added downstream of the particulate trap, including NOx traps and SCR catalysts. The TWC catalyst can be coated on both the inlet side and the outlet side of the particulate trap. Alternatively, an oxidation catalyst can be deposited on a particulate trap. Methods of making and using the same are also provided.
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Citations
20 Claims
- 1. An emission treatment system downstream of a gasoline direct injection engine for treatment of an exhaust system comprising hydrocarbons, carbon monoxide, nitrogen oxides, and particulates, the emission treatment system comprising a catalyzed particulate trap comprising a three-way conversion (TWC) catalyst coated onto or within a particulate trap.
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11. An emission treatment system downstream of a gasoline direct injection engine for treatment of an exhaust system comprising hydrocarbons, carbon monoxide, nitrogen oxides, and particulates, the emission treatment system comprising a catalyzed particulate trap having an oxidation catalyst or a three-way conversion catalyst deposited thereon;
- one or more gas sensors, and an on-board diagnostic (OBD) system.
- View Dependent Claims (12, 13, 14)
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15. A method of treating an exhaust gas comprising hydrocarbons, carbon monoxide, nitrogen oxides, and particulates, the method comprising:
- locating an emissions treatment system downstream of a gasoline direct injection engine;
providing a catalyzed particulate trap that comprises a three-way conversion (TWC) catalyst deposited on a particulate trap in the emissions treatment system; and
contacting exhaust gas from the engine with the catalyzed particulate trap. - View Dependent Claims (16, 17, 18, 19, 20)
- locating an emissions treatment system downstream of a gasoline direct injection engine;
Specification