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.

公开(公告)号：US20190015781A1

公开(公告)日：2019-01-17

申请号：US16068418

申请日：2017-01-05

Applicant: BASF Corporation

Inventor： Xinyi WEI ,  Xiaoming XU ,  Stanley ROTH

IPC: B01D53/94 ,  B01J23/42 ,  B01J35/00 ,  B01J35/04 ,  F01N3/10

Abstract: The present invention relates to diesel oxidation catalyst compositions and catalyst articles, wherein the compositions and articles include a plurality of platinum group nanoparticles substantially in fully reduced form, wherein the nanoparticles have an average particle size of about 1 to about 10 nm and at least about 90% of the nanoparticles have a particle size of +/− about 2 nm of the average particle size. Such compositions can further include a refractory metal oxide material, wherein the nanoparticles and refractory metal oxide material can be combined within the same coating on a substrate or can be applied sequentially on a substrate. The nanoparticles can advantageously be substantially free of halides, alkali metals, alkaline earth metals, sulfur compounds, and boron compounds. Methods of preparing and using such compositions and catalyst articles (e.g., for the treatment of diesel exhaust gas streams) are also provided herein.