Highly active and thermally stable coated gasoline particulate filters
First Claim
1. A coated gasoline particulate filter comprising:
- a substrate,a catalytic layer deposited onto the substrate, the catalytic layer comprising(i) a composition comprising a platinum group metal, iron, and cerium;
or(ii) a composition comprising a doped iron-rhodium oxide.
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Accused Products
Abstract
Coated gasoline particulate filters (cGPFs) that are produced according to varied material compositions and catalyst configurations are disclosed. The cGPFs include Fe—Ce (rich)-activated Rh compositions that provide greater catalytic functionality. These cGPFs are incorporated within engine systems as components of TWC systems for controlling and reducing engine exhaust emissions. The conversion performance of these TWC systems is assessed and compared employing worldwide harmonized light duty test cycle (WLTC) protocol within a gasoline fueled internal combustion engine. These TWC systems exhibit a significant catalytic performance when compared with the catalytic performance of a PGM-based Original Equipment Manufacturer (OEM) catalyst employed in TWC applications. Further, TWC catalysts are produced including Fe-activated Rh layers comprising dopant elements. The catalytic performance of the TWC catalysts is evaluated by performing light-off and standard isothermal oxygen storage capacity oscillating tests. The TWC catalysts exhibit improved catalytic performance and significant oxygen storage capacity.
186 Citations
25 Claims
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1. A coated gasoline particulate filter comprising:
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a substrate, a catalytic layer deposited onto the substrate, the catalytic layer comprising (i) a composition comprising a platinum group metal, iron, and cerium;
or(ii) a composition comprising a doped iron-rhodium oxide. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. A catalytic system for treating an exhaust stream of a combustion engine comprising:
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a combustion engine; a close-coupled catalytic converter configured and arranged to accept at least on exhaust stream from said combustion engine, the close-coupled catalytic converter comprising a platinum group metal catalyst; and a coated gasoline particulate filter downstream of, and in fluid communication with said close-coupled catalytic converter, the particulate filter comprising a substrate onto which a catalytic layer is deposited, the catalytic layer comprising (i) a composition comprising a platinum group metal, iron, and cerium;
or(ii) a composition comprising a doped iron-rhodium oxide; and wherein the catalytic system exhibits a comparable reduction in tailpipe emissions of NOX, CO, THC, and NMHC in comparison to a similar system having an underfloor catalytic converter comprising a platinum group metal catalyst as a downstream converter. - View Dependent Claims (14, 15, 16, 17, 18, 19)
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20. A catalytic system for treating an exhaust stream of a combustion engine comprising:
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a combustion engine; a coated gasoline particulate filter configured and arranged to accept at least on exhaust stream from said combustion engine, the coated gasoline particulate filter comprising a substrate onto which a catalytic layer is deposited, the catalytic layer comprising (i) a composition comprising a platinum group metal, iron, and cerium;
or(ii) a composition comprising a doped iron-rhodium oxide system.
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21. A catalyst comprising
a cordierite flow-through monolith substrate; a catalytic layer deposited onto the substrate, the catalytic layer comprising a doped iron-rhodium oxide catalyst composition having the formula AaRhbFecOx, wherein a is a value from about 0 to 0.3 mole fraction, b is greater than or equal to about 0.0004 mole fraction, and c is from about 0.69 to about 0.9996 mole fraction, and A is selected from the group consisting of zinc, nickel, cobalt, manganese, magnesium, calcium, strontium, yttrium, cerium, lanthanum, praseodymium, neodymium, terbium, ytterbium, gallium, and barium, and wherein the loading of the catalyst composition on the substrate is from about 5 to 120 moles/ft3, and the catalyst exhibits T50 conversion temperatures for NOx and CO less than 245°
C., and a T50 conversion temperatures for THC less than 262°
C.- View Dependent Claims (22, 23, 24, 25)
Specification