Hybrid PGM-ZPGM TWC Exhaust Treatment Systems
First Claim
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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.
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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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Citations
23 Claims
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1. A system for treating the exhaust of a combustion engine, comprising:
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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. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18)
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19. A method for optimizing a catalytic system, comprising:
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providing a catalyst system into at least one stream of combustion exhaust, comprising; a first catalyst body comprising at least one platinum group metal catalyst; and a second catalyst body consisting of a zero platinum group metal; wherein at least one of the first and second catalyst body is suitable for converting at least one of NO, CO and HC through oxidation or reduction. - View Dependent Claims (20, 21, 22, 23)
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Specification