	US 12,065,958 B2
	Systems and methods for recovering catalyst performance
Christopher John Keturakis, Arlington Heights, IL (US)
Assigned to Cummins Emission Solutions Inc., Columbus, IN (US)
Appl. No. 17/631,353
Filed by Cummins Emission Solutions Inc., Columbus, IN (US)
PCT Filed Jul. 14, 2020, PCT No. PCT/US2020/041893 § 371(c)(1), (2) Date Jan. 28, 2022, PCT Pub. No. WO2021/021426, PCT Pub. Date Feb. 4, 2021.
Claims priority of provisional application 62/880,824, filed on Jul. 31, 2019.
Prior Publication US 2022/0325648 A1, Oct. 13, 2022
Int. Cl. F01N 3/20 (2006.01); B01D 53/94 (2006.01); B01J 23/22 (2006.01); B01J 23/92 (2006.01); F01N 3/08 (2006.01); F01N 9/00 (2006.01); F01N 11/00 (2006.01)

CPC F01N 3/2066 (2013.01) [B01J 23/22 (2013.01); B01J 23/92 (2013.01); B01D 53/9418 (2013.01); B01D 53/9422 (2013.01); B01D 2255/20723 (2013.01); F01N 3/0814 (2013.01); F01N 3/0871 (2013.01); F01N 3/0885 (2013.01); F01N 9/005 (2013.01); F01N 11/005 (2013.01); F01N 2260/04 (2013.01); F01N 2370/02 (2013.01); F01N 2560/026 (2013.01); F01N 2560/028 (2013.01); F01N 2570/22 (2013.01); F01N 2900/1404 (2013.01); F01N 2900/1602 (2013.01); F01N 2900/1614 (2013.01)]

20 Claims

1. A method of recovering catalyst performance, comprising:

providing a vanadium selective catalytic reduction (VSCR) catalyst;

exposing the VSCR catalyst to a first humidity level in a range of 50%-100% relative humidity, at a first temperature in a range of 20° C.-100° C., for a first period of time of at least two hours; and

thermally treating the VSCR catalyst at a second temperature in a range of 300° C.-600° C. for a second period of time of at least one hour.