Aftertreatment system

Patent metadata

Field	Value
Publication number	US-12577899-B2
Application number	US-202418959166-A
Country	US
Kind code	B2
Filing date	Nov 25, 2024
Priority date	May 31, 2022
Publication date	Mar 17, 2026
Grant date	Mar 17, 2026

Abstract

An aftertreatment system includes a dosing module. The aftertreatment system includes a selective catalytic reduction unit disposed fluidly downstream of the dosing module. The aftertreatment system includes a conduit fluidly connecting the dosing module to the selective catalytic reduction unit. The conduit has a coating disposed on a surface thereof. The coating is exposed to exhaust passing through the conduit and to the selective catalytic reduction unit. The coating is configured to capture and deactivate platinum passing through the conduit.

First claim

What is claimed is:

1 . An aftertreatment system comprising:
a dosing module; a selective catalytic reduction (SCR) unit disposed fluidly downstream of the dosing module; and a conduit disposed fluidly upstream of the SCR unit and fluidly connecting the dosing module to the SCR unit, the conduit having a coating disposed on a surface thereof, the coating:
exposed to exhaust passing through the conduit and to the SCR unit; and
configured to capture and deactivate platinum passing through the conduit; and
a mixer disposed fluidly upstream of the SCR unit and fluidly downstream of the dosing module, at least a portion of the mixer having the coating disposed thereon.

2 . The aftertreatment system of claim 1 , further comprising:
a decomposition chamber disposed fluidly upstream of the SCR unit, at least a portion of an interior surface of the decomposition chamber having the coating disposed thereon.

3 . The aftertreatment system of claim 1 , wherein at least a portion of an inlet of the SCR unit has the coating disposed thereon.

4 . The aftertreatment system of claim 1 , wherein the coating comprises at least one of copper, phosphorus, sodium, or silicon dioxide.

5 . The aftertreatment system of claim 1 , further comprising:
a diesel oxidation catalyst (DOC) containing platinum; and the coating disposed on the surface of the conduit, downstream of the DOC.

6 . The aftertreatment system of claim 5 , wherein the DOC is disposed fluidly upstream of the SCR unit.

7 . The aftertreatment system of claim 5 , further comprising a diesel particulate filter (DPF), wherein the coating is disposed on the DPF.

8 . The aftertreatment system of claim 7 , wherein the DPF is disposed between the DOC and the SCR unit.

9 . An aftertreatment system comprising:
a diesel oxidation catalyst (DOC) containing platinum; a conduit disposed downstream of the DOC and fluidly coupled to the DOC, the conduit having a coating disposed on a surface thereof, the coating:
exposed to exhaust passing through the conduit and from the DOC; and
configured to capture and deactivate platinum passing through the conduit; and
a dosing module mounted to the conduit, wherein the coating is disposed downstream of the dosing module; and a mixer fluidly coupled to the conduit, at least a portion of the mixer having the coating disposed thereon.

10 . The aftertreatment system of claim 9 , wherein the conduit comprises a decomposition chamber disposed, at least a portion of an interior surface of the decomposition chamber having the coating disposed thereon.

11 . The aftertreatment system of claim 10 , wherein the dosing module is coupled to the decomposition chamber.

12 . The aftertreatment system of claim 9 , further comprising a selective catalytic reduction (SCR) unit fluidly coupled to the conduit, wherein an inlet of the SCR unit has the coating disposed thereon.

13 . The aftertreatment system of claim 9 , wherein the coating is disposed on the surface of the conduit, downstream of the DOC.

14 . A system comprising:
an engine; and an aftertreatment system in exhaust receiving communication with the engine, the aftertreatment system comprising:
a dosing module;
a selective catalytic reduction (SCR) unit disposed fluidly downstream of the dosing module; and
a conduit fluidly connecting the dosing module to the SCR unit, the conduit having a coating disposed on a surface thereof, the coating:
exposed to the exhaust passing through the conduit and to the SCR unit; and
configured to capture and deactivate platinum passing through the conduit;

wherein an inlet of the SCR unit has the coating disposed thereon.

15 . The system of claim 14 , further comprising a decomposition chamber disposed fluidly upstream of the SCR unit, at least a portion of an interior surface of the decomposition chamber having the coating disposed thereon;
wherein the dosing module is coupled to the decomposition chamber.

16 . The system of claim 14 , wherein the coating is disposed non-uniformly on the surface of the conduit such that a thickness of the coating near the dosing module is different than the thickness of the coating near the SCR unit.

17 . The system of claim 14 , wherein the coating is disposed uniformly on the surface of the conduit.

18 . The system of claim 14 , further comprising a diesel oxidation catalyst (DOC) containing platinum, the DOC disposed fluidly upstream of the dosing module;
wherein the conduit fluidly connects the DOC to the SCR unit; and wherein the coating is disposed non-uniformly on the surface of the conduit such that a thickness of the coating near the DOC is different than the thickness of the coating near the SCR unit.

Assignees

• Cummins Inc

Inventors

• Trandal Dylan Scott
• Kamasamudram Krishna
• Dabhoiwala Rayomand
• Punde Shirish S

Classifications

• F01N3/28

  Construction of catalytic reactors · CPC title

• Y02T10/12

  Improving ICE efficiencies · CPC title

• F01N2510/0682

  having a discontinuous, uneven or partially overlapping coating of catalytic material, e.g. higher amount of material upstream than downstream or vice versa · CPC title

• F01N3/2892

  Exhaust flow directors or the like, e.g. upstream of catalytic device · CPC title

• F01N3/021

  by means of filters · CPC title