公开(公告)号：US20180045097A1

公开(公告)日：2018-02-15

申请号：US15552305

申请日：2016-03-18

Applicant: BASF CORPORATION

Inventor： Weiyong Tang ,  Sanath V. Kumar ,  Kevin A. Hallstrom ,  David M. Youngren ,  Kenneth E. Voss

IPC: F01N3/20 ,  B01D53/94 ,  F01N3/035

CPC classification number: F01N3/208 ,  B01D53/9418 ,  B01D53/944 ,  B01D53/9477 ,  B01D2255/50 ,  B01D2255/9155 ,  B01D2257/404 ,  B01D2258/012 ,  B01J29/072 ,  B01J29/76 ,  B01J29/763 ,  B01J35/0006 ,  B01J35/04 ,  B01J37/0246 ,  B01J2229/18 ,  F01N3/035 ,  F01N2570/14 ,  F01N2610/02 ,  Y02A50/2325 ,  Y02A50/2345 ,  Y02T10/24

Abstract: Provided are catalyst articles, methods and systems for treating lean burn engine exhaust. Catalyst articles include selective catalytic reduction catalyst on a particulate filter. The SCR catalyst on the particulate filter provides limited NOx conversion so that unconverted NO2 is available to facilitate passive oxidation of soot trapped on the particulate filter by reaction with NO2. Systems and methods utilize such catalytic articles, and further include, e.g., a downstream selective catalytic reduction catalyst on a flow through substrate.

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.