公开(公告)号：US20230191326A1

公开(公告)日：2023-06-22

申请号：US18000301

申请日：2021-06-24

Applicant: BASF CORPORATION

Inventor： Wen-Mei XUE ,  Ahmad MOINI ,  Ivan PETROVIC

IPC: B01D53/94 ,  B01J29/72 ,  B01J37/00 ,  B01J29/76

CPC classification number: B01D53/9418 ,  B01J29/723 ,  B01J37/0009 ,  B01J29/763 ,  B01D2255/20761 ,  B01D2255/50

Abstract: The present disclosure provides a method for preparing a selective catalytic reduction (SCR) catalyst, the SCR catalyst comprises a metal ion-exchanged zeolite. A method uses an in-situ ion exchange process. A process includes admixing a zeolite in the ammonium (NH4+) form with an aqueous mixture comprising water, a transition metal ion source, and, optionally, an acid, to form a slurry containing a metal ion-exchanged zeolite.

公开(公告)号：US20210388747A1

公开(公告)日：2021-12-16

申请号：US17309116

申请日：2019-10-24

Applicant: BASF Corporation

Inventor： Wen-Mei XUE ,  Ivan PETROVIC ,  Jeff H. YANG ,  Stanley A. ROTH ,  Yuejin LI

IPC: F01N3/20 ,  B01J29/72 ,  B01J35/02 ,  B01J37/03 ,  B01J35/04 ,  B01J37/02 ,  B01J35/00

Abstract: The present disclosure provides catalyst compositions for NOx conversion and catalytic articles incorporating such catalyst compositions. Certain catalyst compositions include a zeolite with a silica-to-alumina ratio from 5 to 20 and sufficient Cu exchanged into cation sites of the zeolite such that the zeolite has a Cu/Al ratio of 0.1 to 0.5 and a CuO loading of 1 to 15 wt. %; and a copper trapping component in a concentration in the range of 1 to 20 wt. %, the copper trapping component including a plurality of particles having a particle size of about 0.5 to 20 microns. Certain catalyst compositions include, as the copper trapping component, alumina present as a plurality of alumina particles with a D90 particle size distribution in the range of 0.5 microns to 20 microns.