AMMONIA SCR CATALYST AND METHOD OF USING THE CATALYST
First Claim
1. An apparatus for reducing NOx in an exhaust stream, comprising:
- a particulate filter; and
a selective catalytic reduction catalyst disposed on the particulate filter, wherein the catalyst comprises;
a first component selected from the group consisting of copper, chromium, cobalt, nickel, manganese, iron, niobium, and mixtures thereof;
a second component selected from the group consisting of cerium, a lanthanide, a mixture of lanthanides, and mixtures thereof; and
at least one material characterized by increased surface acidity.
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Accused Products
Abstract
A DPF with an SCR catalyst and a method for selectively reducing nitrogen oxides with ammonia, filtering particulates, and reducing the ignition temperature of soot on a DPF are provided. The catalyst includes a first component of copper, chromium, cobalt, nickel, manganese, iron, niobium, or mixtures thereof, a second component of cerium, a lanthanide, a mixture of lanthanides, or mixtures thereof, and a component characterized by increased surface acidity. The catalyst may also include strontium as an additional second component. The catalyst selectively reduces nitrogen oxides to nitrogen with ammonia and oxidizes soot at low temperatures. The catalyst has high hydrothermal stability.
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Citations
28 Claims
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1. An apparatus for reducing NOx in an exhaust stream, comprising:
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a particulate filter; and a selective catalytic reduction catalyst disposed on the particulate filter, wherein the catalyst comprises; a first component selected from the group consisting of copper, chromium, cobalt, nickel, manganese, iron, niobium, and mixtures thereof; a second component selected from the group consisting of cerium, a lanthanide, a mixture of lanthanides, and mixtures thereof; and at least one material characterized by increased surface acidity. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 28)
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15. A method for selective catalytic reduction of pollutants in an exhaust stream, removing particulates from an exhaust stream, and reduction of soot ignition temperature in a particulate filter, comprising:
directing the exhaust stream through a particulate filter comprising a selective catalytic reduction catalyst, comprising; a first component selected from the group consisting of copper, chromium, cobalt, nickel, manganese, iron, niobium, and mixtures thereof; a second component selected from the group consisting of cerium, a lanthanide, a mixture of lanthanides, and mixtures thereof; and at least one material characterized by increased surface acidity. - View Dependent Claims (16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27)
Specification