公开(公告)号：US20190170042A1

公开(公告)日：2019-06-06

申请号：US16323145

申请日：2017-08-04

Applicant: BASF Corporation

Inventor： Wen-Mei Xue ,  Jeff H. Yang ,  Stanley A. Roth ,  Kenneth E. Voss ,  Sandip D. Shah ,  Jaya L. Mohanan

IPC: F01N3/20 ,  B01D53/94 ,  B01J29/072 ,  B01J29/76 ,  B01J35/00 ,  B01J37/02 ,  B01J37/08

Abstract: Certain selective catalytic reduction (SCR) articles, systems and methods provide for high NOx conversion while at the same time low N2O formation. The articles, systems and methods are suitable for instance for the treatment of exhaust gas of diesel engines. Certain articles have zoned coatings containing copper-containing molecular sieves disposed thereon, where for example a concentration of catalytic copper in an upstream zone is lower than the concentration of catalytic copper in a downstream zone.

公开(公告)号：US20180043305A1

公开(公告)日：2018-02-15

申请号：US15552183

申请日：2016-02-26

Applicant: BASF Corporation

Inventor： Kenneth E. Voss ,  Jaya L. Mohanan ,  Kevin A. Hallstrom ,  Sandip D. Shah ,  John K. Hochmuth

IPC: B01D53/94

CPC classification number: B01D53/9418 ,  B01D53/9436 ,  B01D53/944 ,  B01D53/9477 ,  B01D2251/2067 ,  B01D2255/102 ,  B01D2255/20738 ,  B01D2255/20761 ,  B01D2255/50 ,  B01D2255/9032 ,  B01D2258/012 ,  Y02T10/24

Abstract: Described are exhaust gas treatment systems for treatment of an engine exhaust gas stream containing NOx. The exhaust gas treatment system comprises an engine, a catalyst system including a selective catalytic reduction article comprising two zones, an upstream zone comprising iron-promoted first molecular sieves and a downstream zone comprising copper-promoted second molecular sieves. The catalyst system is effective to reduce high NOx levels in the exhaust gas stream. Also described are methods for treatment of engine exhaust gas streams, comprising treating engine exhaust gas streams containing high NOx levels with catalyst systems including selective catalytic reduction articles having two zones.