Enhanced catalytic activity at the stoichiometric condition of zero-PGM catalysts for TWC applications
First Claim
1. A catalyst comprising:
- a substrate;
a washcoat layer overlying the substrate, the washcoat layer comprising a support oxide; and
an impregnation layer overlying the washcoat layer, the impregnation layer comprising a doped binary spinel having the formula CuMn2-xNixO4 wherein x is a number from 0.01 to 1.99.
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Accused Products
Abstract
The present disclosure relates to zero-PGM (ZPGM) catalysts including variations of Nickel-doped Copper-Manganese spinel for improved catalyst performance at the stoichiometric condition for use within three-way catalyst (TWC) applications. The ZPGM catalyst material compositions within the aforementioned ZPGM catalysts are expressed with general formulas of Cu1-XNiXMn2O4 (A-site substitution) and Cu1Mn2-XNiXO4 (B-site substitution). The ZPGM catalysts are subjected to a TWC isothermal steady-state sweep test to assess the catalytic performance (e.g., NO conversion). Test results indicate the ZPGM catalysts exhibit higher NO conversions, at stoichiometric condition and lean conditions, when Ni substituted the B-site cation of the Cu—Mn spinel as compared to Ni substituted the A-site cation of the Cu—Mn spinel. Additionally, NO conversions of the ZPGM catalysts are significantly affected, at the stoichiometric condition, by the molar ratio of the Ni dopant within the A or B-site cation of the Cu—Mn spinel.
193 Citations
11 Claims
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1. A catalyst comprising:
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a substrate; a washcoat layer overlying the substrate, the washcoat layer comprising a support oxide; and an impregnation layer overlying the washcoat layer, the impregnation layer comprising a doped binary spinel having the formula CuMn2-xNixO4 wherein x is a number from 0.01 to 1.99. - View Dependent Claims (2, 3, 4)
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5. A catalyst comprising
a substrate; -
a washcoat layer overlying the substrate, the washcoat layer comprising a support oxide; and an impregnation layer overlying the washcoat layer, the impregnation layer comprising a doped binary spinel having the formula Cu1-xNixMn2O4 wherein x is a number from 0.01 to 0.99. - View Dependent Claims (6, 7, 8, 9, 10, 11)
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Specification