公开(公告)号：US20220410133A1

公开(公告)日：2022-12-29

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

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.

公开(公告)号：US20210213434A1

公开(公告)日：2021-07-15

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

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.