APPLICATION OF SYNERGIZED-PGM WITH ULTRA-LOW PGM LOADINGS AS CLOSE-COUPLED THREE-WAY CATALYSTS FOR INTERNAL COMBUSTION ENGINES
First Claim
1. A catalytic system for treating an exhaust stream of a combustion engine, comprisinga combustion engine;
- a close-coupled catalytic converter configured to accept at least one exhaust gas stream from said combustion engine, the close-coupled catalytic converter comprising a synergized platinum group metal catalyst comprising a zero platinum group metal spinel catalyst composition and an ultra-low platinum group metal catalyst material, wherein the platinum group metal catalyst material has a platinum group metal concentration of about 1 g/ft3 to about 10 g/ft3; and
an underfloor catalytic converter downstream of, and, in fluid communication with said close-coupled catalytic converter, the underfloor catalytic converter comprising a platinum group metal catalyst.
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Abstract
Synergized platinum group metals (SPGM) with ultra-low PGM loadings employed as close-coupled (CC) three-way catalysts (TWC) systems with varied material compositions and configurations are disclosed. SPGM CC catalysts in which ZPGM compositions of binary or ternary spinel structures supported onto support oxides are coupled with commercialized PGM UF catalysts and tested under Federal Test Procedure FTP-75 within TGDI and PI engines. The performance of the TWC systems including SPGM CC (with ultra-low PGM loadings) catalyst and commercialized PGM UF catalyst is compared to the performance of commercialized PGM CC and PGM UF catalysts. The disclosed TWC systems indicate that SPGM CC TWC catalytic performance is comparable or even exceeds high PGM-based conventional TWC catalysts, with reduced tailpipe emissions.
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Citations
20 Claims
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1. A catalytic system for treating an exhaust stream of a combustion engine, comprising
a combustion engine; -
a close-coupled catalytic converter configured to accept at least one exhaust gas stream from said combustion engine, the close-coupled catalytic converter comprising a synergized platinum group metal catalyst comprising a zero platinum group metal spinel catalyst composition and an ultra-low platinum group metal catalyst material, wherein the platinum group metal catalyst material has a platinum group metal concentration of about 1 g/ft3 to about 10 g/ft3; and an underfloor catalytic converter downstream of, and, in fluid communication with said close-coupled catalytic converter, the underfloor catalytic converter comprising a platinum group metal catalyst. - 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 removing pollutants from an exhaust stream of a combustion engine, comprising
introducing an exhaust stream of the combustion engine into a close-coupled catalytic converter comprising a synergized platinum group metal catalyst comprising a zero platinum group metal spinel catalyst composition and an ultra-low platinum group metal catalyst material, wherein the platinum group metal catalyst has a concentration of about 1 g/ft3 to about 10 g/ft3 to thereby at least partially catalytically convert NOx, CO, and THC; introducing the at least partially catalytically converted exhaust stream into an underfloor catalytic converter comprising a platinum group metal catalyst. - View Dependent Claims (20)
Specification