Low temperature catalyst/hydrocarbon trap
AssigneeFord Global Technologies, LLC
InventorsLifeng Xu, Robert Walter McCabe, Jason Aaron Lupescu
Life of this patent
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Abstract
A low-temperature catalyst is provided for reducing cold-start hydrocarbon emissions. The catalyst comprises a platinum group metal impregnated onto an oxygen storage material. The catalyst may be used alone or may be included in a hydrocarbon trap containing a hydrocarbon adsorption material therein. The catalyst/hydrocarbon trap is positioned in the exhaust system of a vehicle downstream from a close-coupled catalyst such that the exhaust temperature at the catalyst location does not exceed 850° C. during normal vehicle operation and when combined with a hydrocarbon adsorption material in a trap, the exhaust temperature does not exceed 700° C.
Claims23
A low-temperature catalyst for reducing cold-start vehicle exhaust emissions comprising:
- a platinum group metal impregnated onto an oxygen storage material and calcined to bond said catalyst to said oxygen storage material, said bonded platinum group metal and oxygen storage material being contained on a support structure;
- wherein said catalyst is adapted to be positioned in the exhaust system of a vehicle downstream of a closed-coupled catalyst such that the exhaust gas temperature in said catalyst does not exceed 850° C. during normal vehicb operation.
A hydrocarbon trap for reducing cold-start vehicle exhaust emissions comprising:
- a catalyst comprising a platinum group metal impregnated onto an oxygen storage material and calcined to bond said platinum group metal to said oxygen storage material, wherein said catalyst is contained on a support structure selected from the group consisting of a zeolite, an extruded zeolite, and a cordierite whose walls are coated with a zeolite;
- wherein said trap is adapted to be positioned in the exhaust system of a vehicle downstream of a close-coupled catalyst.
An exhaust treatment system comprising:
- a close-coupled catalyst;
- a low temperature catalyst positioned downstream from said close-coupled catalyst, said catalyst comprising a platinum group metal impregnated onto an oxygen storage material and calcined to bond said platinum group metal to said oxygen storage material, said catalyst forming a washcoat on a support structure;
- wherein the exhaust gas temperature from a vehicle engine at the position of said catalyst does not exceed 850° C. during normal vehicle operation.
An exhaust treatment system comprising:
- a close-coupled catalyst;
- a hydrocarbon trap positioned downstream from said close-coupled catalyst, said trap comprising a catalyst comprising a platinum group metal impregnated onto an oxygen storage material and calcined to bond said platinum group metal to said oxygen storage material, said catalyst forming a washcoat on a support structure selected from the group consisting of a zeolite, an extruded zeolite, and a porous cordierite whose walls are coated with a zeolite;
A method for reducing cold start hydrocarbon emissions from a vehicle engine comprising:
- providing a hydrocarbon trap in the exhaust passage of a vehicle downstream from a close-coupled catalyst, said trap comprising a catalyst comprising a platinum group metal impregnated onto an oxygen storage material and calcined to bond said platinum metal group to said oxygen storage material, said catalyst forming a washcoat on a support structure selected from the group consisting of a zeolite, an extruded zeolite, and a porous cordierite whose walls are coated with a zeolite;
- and
- passing exhaust gases through said trap.
Dependencies are inferred from the claim text.