US 11,867,106 B2
Systems and methods for desulfation of catalysts included in aftertreatment systems
Michael Cunningham, Columbus, IN (US); Aleksey Yezerets, Columbus, IN (US); Junhui Li, Columbus, IN (US); and James A. Cramer, Columbus, IN (US)
Assigned to Cummins Emission Solutions Inc., Columbus, IN (US)
Filed by Cummins Emission Solutions Inc., Columbus, IN (US)
Filed on May 16, 2023, as Appl. No. 18/197,930.
Application 18/197,930 is a division of application No. 17/602,233, granted, now 11,698,011, previously published as PCT/US2020/025647, filed on Mar. 30, 2020.
Claims priority of provisional application 62/831,482, filed on Apr. 9, 2019.
Prior Publication US 2023/0287816 A1, Sep. 14, 2023
Int. Cl. F01N 3/10 (2006.01); F01N 13/00 (2010.01); B01D 53/94 (2006.01); B01D 53/96 (2006.01); F01N 3/023 (2006.01); F01N 3/20 (2006.01); F01N 9/00 (2006.01); F01N 3/021 (2006.01)
CPC F01N 3/103 (2013.01) [B01D 53/9477 (2013.01); B01D 53/9495 (2013.01); B01D 53/96 (2013.01); F01N 3/021 (2013.01); F01N 3/023 (2013.01); F01N 3/2066 (2013.01); F01N 9/002 (2013.01); F01N 13/009 (2014.06); B01D 2251/208 (2013.01); B01D 2251/2067 (2013.01); F01N 2570/04 (2013.01); F01N 2900/1602 (2013.01); F01N 2900/1612 (2013.01)] 4 Claims
OG exemplary drawing
 
1. An aftertreatment system for reducing constituents of an exhaust gas having a sulfur content, the aftertreatment system comprising:
an oxidation catalyst;
a filter disposed downstream of the oxidation catalyst; and
a controller configured to, in response to determining that the filter is to be regenerated and a desulfation condition being satisfied:
cause a temperature of the oxidation catalyst to increase to a first regeneration temperature that is greater than or equal to 400 degrees Celsius and less than 550 degrees Celsius,
cause the temperature of the oxidation catalyst to be maintained at the first regeneration temperature for a first time period, and
after the first time period, cause the temperature of the oxidation catalyst to increase to a second regeneration temperature equal to or greater than 550 degrees Celsius,
wherein the desulfation condition being satisfied comprises a measured exotherm of the oxidation catalyst being smaller than the exothermal efficiency curve of a non-sulfated oxidation catalyst.