Method for Improving Lean Performance of PGM Catalyst Systems: Synergized PGM
First Claim
1. A method for optimizing a catalytic system, comprising:
- providing a catalyst system into at least one stream of lean combustion exhaust, comprising;
a substrate;
a washcoat suitable for deposition on the substrate, comprising at least one oxygen storage material further comprising Cu-Mn spinel having a niobium-zirconia support oxide; and
an overcoat suitable for deposition on the substrate, comprising at least one platinum group metal catalyst and at least one carrier support oxide; and
converting at least one of NO, CO and HC through oxidation or reduction.
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Abstract
Synergized Platinum Group Metals (SPGM) catalyst system for TWC application is disclosed. Disclosed SPGM catalyst system may include a washcoat with a Cu—Mn spinel structure and an overcoat that includes PGM supported on carrier material oxides, such as alumina. SPGM catalyst system shows significant improvement in nitrogen oxide reduction performance under stoichiometric operating conditions and especially under lean operating conditions, which allows a reduced consumption of fuel. Additionally, disclosed SPGM catalyst system also enhances the reduction of carbon monoxide and hydrocarbon within catalytic converters. Furthermore, disclosed SPGM catalyst systems are found to have enhanced catalyst activity compared to commercial PGM catalyst system, showing that there is a synergistic effect among PGM catalyst and Cu—Mn spinel within the disclosed SPGM catalyst system.
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Citations
15 Claims
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1. A method for optimizing a catalytic system, comprising:
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providing a catalyst system into at least one stream of lean combustion exhaust, comprising; a substrate; a washcoat suitable for deposition on the substrate, comprising at least one oxygen storage material further comprising Cu-Mn spinel having a niobium-zirconia support oxide; and an overcoat suitable for deposition on the substrate, comprising at least one platinum group metal catalyst and at least one carrier support oxide; and converting at least one of NO, CO and HC through oxidation or reduction. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A method for optimizing a catalytic system, comprising:
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providing a catalyst system into at least one stream of lean combustion exhaust produced by an engine, comprising; a substrate; a washcoat suitable for deposition on the substrate, comprising at least one oxygen storage material further comprising Cu—
Mn spinel having a niobium-zirconia support oxide; andan overcoat suitable for deposition on the substrate, comprising at least one platinum group metal catalyst and at least one carrier support oxide; and converting at least one of NO, CO and HC through oxidation or reduction; wherein the Cu—
Mn spinel is stoichiometric. - View Dependent Claims (11, 12, 13, 14, 15)
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Specification