	US 12,104,517 B2
	Treated SCR catalysts with enhanced sulfur resistance
Changsheng C. Su, Columbus, IN (US); Yuanzhou Xi, Verona, WI (US); Jinqian Gong, Columbus, IN (US); Ramakrishna Gopal Dontha, Columbus, IN (US); Nathan A. Ottinger, Lenoir City, TN (US); Z. Gerald Liu, Madison, WI (US); and James C. Clerc, Columbus, IN (US)
Assigned to Cummins Emission Solutions Inc., Columbus, IN (US)
Appl. No. 17/423,823
Filed by Cummins Emission Solutions Inc., Columbus, IN (US)
PCT Filed Jan. 10, 2020, PCT No. PCT/US2020/013052 § 371(c)(1), (2) Date Jul. 16, 2021, PCT Pub. No. WO2020/150087, PCT Pub. Date Jul. 23, 2020.
Claims priority of provisional application 62/794,332, filed on Jan. 18, 2019.
Prior Publication US 2022/0112824 A1, Apr. 14, 2022
Int. Cl. F01N 3/20 (2006.01); B01J 6/00 (2006.01); B01J 29/72 (2006.01)

CPC F01N 3/208 (2013.01) [B01J 6/001 (2013.01); B01J 29/723 (2013.01); F01N 2570/14 (2013.01)]

5 Claims

1. A method for enhancing sulfur resistance of a selective catalytic reduction (SCR) catalyst, comprising:

providing raw materials of the SCR catalyst;

heating the raw materials to a temperature greater than 500 degrees Celsius for a predetermined time in the presence of water vapor to age the raw materials;

forming an aged SCR catalyst from the aged raw materials;

calcining the aged SCR catalyst;

providing a matrix;

applying the aged SCR catalyst on a first portion of the matrix; and

applying a non-aged SCR catalyst on a second portion of the matrix downstream of the first portion.