Hybrid PGM-ZPGM TWC Exhaust Treatment Systems

摘要

Hybrid PGM-ZPGM three-way catalyst (TWC) exhaust treatment systems are disclosed. The hybrid PGM-ZPGM TWC systems include a PGM close-coupled catalytic converter followed by an underfloor catalytic converter. The underfloor catalytic converter includes a ZPGM-based catalyst. Additionally, the underfloor catalytic converter can also be a PGM/ZPGM zone coated catalytic converter. The disclosed hybrid TWC systems comprising PGM-based and ZPGM-based catalysts can replace pure PGM-based exhaust treatment systems.

主权项

1. A system for treating the exhaust of a combustion engine, comprising:
at least one exhaust manifold suitable for accepting at least one stream of exhaust; a closed-couple converter having a first catalyst body comprising at least one platinum group metal catalyst; and an underfloor converter having a second catalyst body consisting of a zero platinum group metal; wherein the at least one exhaust manifold is communicatively coupled to the closed-couple converter and underfloor converter.