MULTIFUNCTIONAL FILTERS FOR DIESEL EMISSION CONTROL
First Claim
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1. A catalyzed particulate filter comprising:
- a plurality of porous walls extending longitudinally to form a plurality of parallel passages extending from an inlet end to an outlet end, wherein a quantity of the passages are inlet passages that are open at the inlet end and closed at the outlet end, and a quantity of passages are outlet passages that are closed at the inlet end and open at the outlet end;
a first coating permeating through at least a portion of the porous walls of the particulate filter, wherein the length of porous wall permeated with the first coating is in the range of about 1% to about 80% of the wall length extending from the outlet end of the passages, and wherein the first coating is an oxidation catalyst comprising a platinum group metal; and
a second coating permeating through at least a portion of the porous walls of the particulate filter, wherein the length of porous wall permeated with the second coating is in the range of about 50% to about 100% of the wall length extending from the inlet end of the passages, and wherein the second coating comprises a first selective catalytic reduction catalyst.
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Abstract
Provided are multi-zone catalyst articles, methods of manufacturing multi-zone catalyst articles, and methods for controlling emissions in diesel engine exhaust streams with multi-zone catalyst articles, where the emission treatment system of various embodiments effectively treats diesel engine exhaust with a single multi-zone catalyst article.
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Citations
23 Claims
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1. A catalyzed particulate filter comprising:
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a plurality of porous walls extending longitudinally to form a plurality of parallel passages extending from an inlet end to an outlet end, wherein a quantity of the passages are inlet passages that are open at the inlet end and closed at the outlet end, and a quantity of passages are outlet passages that are closed at the inlet end and open at the outlet end; a first coating permeating through at least a portion of the porous walls of the particulate filter, wherein the length of porous wall permeated with the first coating is in the range of about 1% to about 80% of the wall length extending from the outlet end of the passages, and wherein the first coating is an oxidation catalyst comprising a platinum group metal; and a second coating permeating through at least a portion of the porous walls of the particulate filter, wherein the length of porous wall permeated with the second coating is in the range of about 50% to about 100% of the wall length extending from the inlet end of the passages, and wherein the second coating comprises a first selective catalytic reduction catalyst. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
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16. A method of manufacturing a coated particulate filter, comprising:
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introducing an oxidation catalyst comprising a plurality of particles into an outlet end of a plurality of parallel passages formed by a plurality of porous walls closed by a plug on an inlet end opposite the outlet end, wherein the particles of the oxidation catalyst permeates through at least a portion of the porous walls, and wherein the length of porous wall permeated with the oxidation catalyst is in the range of about 1% to about 80% of the wall length extending from the outlet end of the passages; and introducing a first selective catalytic reduction catalyst comprising a plurality of particles into an inlet end of a plurality of parallel passages formed by a plurality of porous walls closed by a plug on an outlet side opposite the inlet side, wherein the particles of the first selective catalytic reduction catalyst permeates through the porous walls, and wherein the length of porous wall permeated with the particles of the first selective catalytic reduction catalyst is in the range of about 50% to about 100% of the wall length extending from the inlet end of the passages. - View Dependent Claims (17, 18, 19, 20, 21, 22, 23)
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Specification