公开(公告)号：US20220212162A1

公开(公告)日：2022-07-07

申请号：US17608174

申请日：2020-05-07

Applicant: BASF CORPORATION

Inventor： Xinyi Wei ,  Xiaoming Xu ,  Evan Vincent Miu

IPC: B01J20/18 ,  F01N3/08 ,  B01D53/94 ,  B01J20/32 ,  B01J29/67 ,  B01J29/74

Abstract: The present disclosure is directed to Low Temperature NOx-Absorber (LT-NA) catalyst compositions, catalyst articles, and an emission treatment system for treating an exhaust gas, each including the LT-NA catalyst compositions. Further provided are methods for reducing a NOx level in an exhaust gas stream using the catalyst article. In particular, the LT-NA compositions include a zeolite containing a first metal component including palladium and a second metal component which is an alkaline earth metal component, an oxide of an alkaline earth metal component, a rare earth metal component, an oxide of a rare earth metal component, or a combination thereof. The LT-NA compositions exhibit increased low temperature NOx adsorption capacity and enhanced hydrothermal stability.

公开(公告)号：US11413607B2

公开(公告)日：2022-08-16

申请号：US17250103

申请日：2019-05-29

Applicant: BASF Corporation

Inventor： Jia Cheng Liu ,  Evan Vincent Miu ,  Xiaoming Xu ,  Xinyi Wei ,  Stefan Maurer

IPC: B01D53/94 ,  B01J29/67 ,  B01J29/74 ,  B01J35/00 ,  B01J35/02 ,  B01J35/04 ,  B01J35/10 ,  B01J37/00 ,  B01J37/03 ,  F01N3/28

Abstract: The present disclosure is directed to a Low Temperature NOx-Absorber (LT-NA) catalyst composition which exhibits NOx adsorption in a broad temperature and space velocity range, and shifts NOx desorption to a desired temperature range. In particular, the LT-NA composition includes a large pore zeolite containing a palladium component and a small or medium pore zeolite containing a palladium component. Further provided is a catalyst article including the LT-NA catalyst composition, an emission treatment system for treating an exhaust gas including the catalyst article, and methods for reducing a NOx level in an exhaust gas stream using the catalyst article.

公开(公告)号：US11890600B2

公开(公告)日：2024-02-06

申请号：US17754951

申请日：2020-10-19

Applicant: BASF Corporation

Inventor： Xinyi Wei ,  Evan Vincent Miu ,  Xiaoming Xu ,  Jia Cheng Liu ,  Stefan Maurer

IPC: B01J29/06 ,  B01J29/74 ,  B01J29/80 ,  B01J23/42 ,  B01J21/08 ,  B01J35/00 ,  B01J35/04 ,  B01D53/94 ,  F01N3/28 ,  B01J29/67

CPC classification number: B01J29/67 ,  B01D53/944 ,  B01D53/9422 ,  B01D53/9468 ,  B01D53/9472 ,  B01D53/9477 ,  B01J21/08 ,  B01J23/42 ,  B01J29/7415 ,  B01J29/80 ,  B01J35/0006 ,  B01J35/0013 ,  B01J35/04 ,  F01N3/2803 ,  B01D2255/1021 ,  B01D2255/1023 ,  B01D2255/50 ,  B01D2255/9022 ,  B01D2255/9032 ,  B01D2255/9035 ,  B01D2255/9155 ,  B01D2255/9202 ,  B01J2029/062 ,  F01N2370/04

Abstract: The present disclosure provides Low Temperature NOx-Absorber (LT-NA) catalyst compositions, catalyst articles, and an emission treatment system for treating an exhaust gas, each including the LT-NA catalyst compositions. Further provided are methods for reducing a NOx level in an exhaust gas stream using the LT-NA catalyst articles. In particular, the LT-NA catalyst compositions include a first zeolite, a first palladium component, and a plurality of platinum nanoparticles. The LT-NA catalyst compositions exhibit enhanced regeneration efficiency with respect to NOx adsorption capacity, even after hydrothermal aging.