	US 12,372,020 B2
	Preparation of SCR catalyst comprising Cu and Fe-exchanged zeolite, said catalyst, system comprising said catalyst and exhaust gas treatment using such
Jeff H. Yang, Iselin, NJ (US); Wen-Mei Xue, Iselin, NJ (US); and Stanley A. Roth, Yardley, PA (US)
Assigned to BASF Corporation, Florham Park, NJ (US)
Appl. No. 18/266,015
Filed by BASF Corporation, Florham Park, NJ (US)
PCT Filed Dec. 8, 2021, PCT No. PCT/EP2021/084733 § 371(c)(1), (2) Date Jun. 8, 2023, PCT Pub. No. WO2022/122799, PCT Pub. Date Jun. 16, 2022.
Claims priority of application No. 20212706 (EP), filed on Dec. 9, 2020.
Prior Publication US 2024/0068387 A1, Feb. 29, 2024
Int. Cl. F01N 3/20 (2006.01); B01D 53/94 (2006.01); B01J 29/072 (2006.01); B01J 37/02 (2006.01); B01J 37/08 (2006.01); B01J 37/30 (2006.01); F01N 3/035 (2006.01); F01N 3/08 (2006.01); F01N 3/10 (2006.01); F01N 13/00 (2010.01)

CPC F01N 3/2066 (2013.01) [B01D 53/9418 (2013.01); B01J 29/072 (2013.01); B01J 37/0215 (2013.01); B01J 37/08 (2013.01); B01J 37/30 (2013.01); F01N 3/035 (2013.01); F01N 3/106 (2013.01); F01N 13/009 (2014.06); B01D 53/9422 (2013.01); B01D 53/9427 (2013.01); B01D 53/9445 (2013.01); B01D 2255/50 (2013.01); B01D 2258/01 (2013.01); F01N 3/0814 (2013.01); F01N 3/0871 (2013.01); F01N 3/208 (2013.01); F01N 2250/02 (2013.01); F01N 2570/14 (2013.01)]

14 Claims

1. A process for preparing a catalyst for the selective catalytic reduction of nitrogen oxide comprising

(1) providing a zeolitic material comprising SiO₂and X₂O₃in its framework structure, wherein X is a trivalent element;

(2) subjecting the zeolitic material provided in (1) to an ion exchange procedure with one or more copper (II) containing compounds;

(3) preparing a slurry comprising the Cu ion-exchanged zeolitic material obtained in (2), one or more iron (II) and/or iron (III) containing compounds, and a solvent system;

(4) providing a substrate and coating the slurry obtained in (3) onto the substrate;

(5) calcining the coated substrate obtained in (4);

wherein the Fe:Cu molar ratio of the total amount of iron comprised in the slurry prepared in (3), to the total amount of copper contained in the Cu ion-exchanged zeolitic material comprised in the slurry prepared in (3), is comprised in a range of from 0.1 to 15.