Platinum group metal-free catalysts for reducing the ignition temperature of particulates on a diesel particulate filter
First Claim
1. A catalyzed diesel particulate filter consisting essentially of:
- a) a substrate for filtering particulates from diesel engine exhaust; and
b) a catalyst composition, wherein said catalyst composition comprises;
i) at least one first component selected from the group consisting of cerium, a lanthanide and mixtures thereof; and
ii) at least one second component selected from the group consisting of copper, manganese and mixtures thereof,wherein said first component and said second component are in an oxide form after a calcination;
wherein the catalyst composition does not comprise metal sulfates and platinum group metals, and further wherein the catalyst composition does not comprise a perovskite and the second component does not comprise cobalt.
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Abstract
A catalyzed diesel particulate filter (CDPF) and a method for filtering particulates from diesel engine exhaust are provided, where the catalyzed diesel particulate filter includes a substrate and a catalyst composition, where the catalyst composition contains at least one first component, at least one second component, and at least one third component, where the first component is at least one first component selected from the group consisting of cerium and a lanthanide and mixtures thereof, the at least one second component is selected from the group consisting of cobalt, copper, manganese and mixtures thereof; and the third component comprises strontium, where the first component, the second component, and the third component are in an oxide form after calcination. The catalyst on the catalyzed diesel particulate filter lowers the temperature at which particulates are removed from the CDPF by oxidizing the particulates on the filter. The catalyzed diesel particulate filter may also include a washcoat. Washcoats prepared from colloidal aluminum oxide may have higher surface areas and pore volumes loadings than washcoats containing aluminum oxide prepared from aluminum nitrate.
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Citations
18 Claims
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1. A catalyzed diesel particulate filter consisting essentially of:
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a) a substrate for filtering particulates from diesel engine exhaust; and b) a catalyst composition, wherein said catalyst composition comprises; i) at least one first component selected from the group consisting of cerium, a lanthanide and mixtures thereof; and ii) at least one second component selected from the group consisting of copper, manganese and mixtures thereof, wherein said first component and said second component are in an oxide form after a calcination;
wherein the catalyst composition does not comprise metal sulfates and platinum group metals, and further wherein the catalyst composition does not comprise a perovskite and the second component does not comprise cobalt. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A catalyzed diesel particulate filter, consisting essentially of:
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a) a substrate for filtering particulates from diesel engine exhaust, wherein the substrate has a washcoat thereon; and b) a catalyst composition, wherein said catalyst composition comprises; i) at least one first component selected from the group consisting of cerium, a lanthanide and mixtures thereof; and ii) at least one second component selected from the group consisting of copper, manganese and mixtures thereof, wherein said first component and said second component are in an oxide form after a calcination;
wherein the catalyst composition does not comprise metal sulfates and platinum group metals, and further wherein the catalyst composition does not comprise a perovskite and the second component does not comprise cobalt. - View Dependent Claims (10, 11, 12, 13, 14, 15, 16)
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17. A catalyzed diesel particulate filter consisting essentially of:
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a) a substrate for filtering particulates from diesel engine exhaust; and b) a catalyst composition, wherein said catalyst composition comprises; i) at least one first component selected from the group consisting of cerium, a lanthanide and mixtures thereof; and ii) at least one second component selected from the group consisting of copper, manganese and mixtures thereof, and c) at least one third component comprising strontium, wherein said first component, said second component, and said third component are in an oxide foam after a calcination; wherein the catalyst composition does not comprise metal sulfates and platinum group metals, and further wherein the catalyst composition does not comprise a perovskite and the second component does not comprise cobalt. - View Dependent Claims (18)
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Specification