Hybrid PGM-ZPGM TWC Exhaust Treatment Systems
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May 28, 2015
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Nov 26, 2013
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Abstract
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.
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