Base metal activated rhodium coatings for catalysts in three-way catalyst (TWC) applications
First Claim
1. A catalytic system comprising:
- a ceramic substrate coated with Fe-activated Rh at a loading of about 90 g/L.
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Abstract
Close-coupled catalysts (CCC) for TWC applications are disclosed. The novel CCCs are implemented using light-weighted ceramic substrates in which a thin coating employing a low loading of Iron (Fe)-activated Rhodium (Rh) material composition, with Iron loadings and an OSM of Ceria-Zirconia, are deposited onto the substrates. Different CCC samples are produced to determine and/or verify improved light-off (LO) and NOX conversion of the CCCs. Other CCC samples produced are a CCC including a standard (non-activated) Rh thin coating and a heavily loaded CCC with a single coating of Pd/Rh material composition. The CCC samples are aged under dyno-aging using the multi-mode aging cycle and their performance tested using a car engine with ports on the exhaust to measure the emissions, according to the testing protocol in the Environmental Protection Agency Federal Test Procedure 75. During testing, the thin coatings of Fe-activated Rh exhibit improved light-off and NOx conversion efficiency.
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14 Claims
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1. A catalytic system comprising:
- a ceramic substrate coated with Fe-activated Rh at a loading of about 90 g/L.
- View Dependent Claims (2, 3, 4)
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5. A catalytic system comprising:
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a ceramic substrate coated with Fe-activated Rh; wherein the Rh loadings are from about 1 g/ft3 to about 20 g/ft3 and the Fe loadings are from about 1 g/ft3 to about 20 g/ft3; and wherein the Fe-activated Rh is supported on a OSM. - View Dependent Claims (6, 7, 8, 9, 10, 11, 12, 13, 14)
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Specification