Synergized PGM Close-Coupled Catalysts for TWC Applications
First Claim
1. A catalytic system, comprising:
- a first catalytic apparatus comprising at least two catalytic portions; and
a second catalytic apparatus comprising at least one catalytic portion;
wherein one of the at least two catalytic portions of the first catalytic apparatus comprises at least one binary spinel composition and wherein one of the at least two catalytic portions of the first catalytic apparatus comprises a close-coupled catalyst; and
wherein the at least one catalytic portion of the second catalytic apparatus comprises a platinum group metal.
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Abstract
Synergized PGM catalyst converters configured as three-way catalyst (TWC) systems are disclosed. The disclosed SPGM system configurations exhibit high thermal stability, attenuated air to fuel (A/F) perturbations, enhanced TWC activity, and high catalytic conversion efficiency as a result of synergizing a low PGM loading close-coupled catalyst (CCC), with Ce-based oxygen storage, with a front spinel zone of suitable mixed metal oxide compositions acting as pre-catalyst for oxygen storage. The attenuation of A/F perturbations to lower amplitude, before exhaust gas emissions go into the standard PGM CCC, allows the system to work within a range of R values very close to the stoichiometric point for both lean and rich conditions, and high catalytic conversion efficiency in NOX, CO, and HC conversions. The disclosed SPGM system configurations can be utilized in a plurality of TWC applications, such as conventional TWC systems including an optional underfloor catalyst.
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Citations
20 Claims
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1. A catalytic system, comprising:
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a first catalytic apparatus comprising at least two catalytic portions; and a second catalytic apparatus comprising at least one catalytic portion; wherein one of the at least two catalytic portions of the first catalytic apparatus comprises at least one binary spinel composition and wherein one of the at least two catalytic portions of the first catalytic apparatus comprises a close-coupled catalyst; and wherein the at least one catalytic portion of the second catalytic apparatus comprises a platinum group metal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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14. A catalytic system, comprising:
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a catalytic apparatus comprising at least two catalytic portions wherein exhaust from at least one internal combustion engine is received; wherein one of the at least two catalytic portions comprises at least one binary spinel composition and wherein one of the at least two catalytic portions comprises a close-coupled catalyst. - View Dependent Claims (15, 16, 17, 18, 19, 20)
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Specification