Exhaust treatment system with NO2 control
First Claim
1. An exhaust treatment system comprising:
- a catalyzed particulate filter disposed in a first passageway and configured to receive a first portion of a flow of exhaust, the catalyzed particulate filter being at least partially coated with a catalytic material for converting NO to NO2;
a second passageway configured to direct a second portion of the flow of exhaust around the catalyzed particulate filter;
a selective catalytic reduction device disposed downstream from the first passageway and the second passageway, the selective catalytic reduction device being configured to receive a combined flow of exhaust including the first and second portions of the flow of exhaust.
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Accused Products
Abstract
An exhaust treatment system includes a catalyzed particulate filter disposed in a first passageway and configured to receive a first portion of a flow of exhaust. The catalyzed particulate filter is at least partially coated with a catalytic material for converting NO to NO2. The exhaust treatment system also includes a second passageway configured to direct a second portion of the flow of exhaust around the catalyzed particulate filter and a selective catalytic reduction device disposed downstream from the first passageway and the second passageway. The selective catalytic reduction device is configured to receive a combined flow of exhaust including the first and second portions of the flow of exhaust.
85 Citations
28 Claims
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1. An exhaust treatment system comprising:
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a catalyzed particulate filter disposed in a first passageway and configured to receive a first portion of a flow of exhaust, the catalyzed particulate filter being at least partially coated with a catalytic material for converting NO to NO2; a second passageway configured to direct a second portion of the flow of exhaust around the catalyzed particulate filter; a selective catalytic reduction device disposed downstream from the first passageway and the second passageway, the selective catalytic reduction device being configured to receive a combined flow of exhaust including the first and second portions of the flow of exhaust. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. A method for treating a flow of exhaust comprising:
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generating the flow of exhaust; passing a first portion of the flow of exhaust through a first passageway including a catalyzed particulate filter at least partially coated with a catalytic material for converting NO to NO2; passing a second portion of the flow of exhaust through a second passageway configured to direct the second portion of the flow of exhaust around the catalyzed particulate filter; combining the first and second portions of the flow of exhaust downstream from the catalyzed particulate filter to form a combined flow of exhaust; and directing the combined flow of exhaust to a selective catalytic reduction device. - View Dependent Claims (14, 15, 16, 17, 18, 19, 20)
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21. An exhaust treatment system comprising:
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a catalyzed particulate filter disposed in a first passageway and configured to receive a first portion of a flow of exhaust, the catalyzed particulate filter being at least partially coated with a catalytic material for converting NO to NO2; an upstream injector disposed upstream from the catalyzed particulate filter, the upstream injector configured to inject reductant into the first portion of the flow of exhaust; a second passageway configured to direct a second portion of the flow of exhaust around the catalyzed particulate filter; and a selective catalytic reduction device disposed downstream from the catalyzed particulate filter and the second passageway, the selective catalytic reduction device being configured to receive a combined flow of exhaust including the first and second portions of the flow of exhaust. - View Dependent Claims (22, 23, 24, 25, 26, 27, 28)
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Specification