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US 2015/0147239 A1Published application
ZPGM Underfloor Catalyst for Hybrid Exhaust Treatment Systems
AssigneeClean Diesel Technologies Inc. (Cdti)
InventorsMaxime Launois, Randal L. Hatfield
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Abstract
Hybrid PGM-ZPGM exhaust treatment systems are disclosed. The systems include a PGM close-couple catalytic converter followed by an underfloor ZPGM catalytic converter. The disclosed hybrid systems, including PGM based catalysts and zero-PGM based catalysts may replace pure PGM based exhaust treatment systems. The ZPGM catalyst compositions used may include copper and cerium as active ZPGM catalysts. The disclosed ZPGM underfloor converters may be designed to convert leaks from close-couple converters.
Claims14
A catalyst system for use during an urban drive cycle, the catalyst system comprising:
- at least one close-couple converter;
- and
- at least one underfloor converter;
- wherein the underfloor converter comprises a zero platinum group metal (ZPGM) catalyst system, comprising:
- a substrate;
- a washcoat suitable for deposition on the substrate, comprising at least one first oxygen storage material and alumina;
- and
- an overcoat suitable for deposition on the substrate, comprising at least one second oxygen storage material and one selected from the group comprising copper oxide, ceria, alumina, and mixtures thereof.
5 more elements
Dependencies are inferred from the claim text.