Title:
アンモニア生成触媒およびＳＣＲ触媒を備える排出処理システム
Document Type and Number:
Japanese Patent JP6289807
Kind Code:
B2
Abstract:
Provided are emissions treatment systems for an exhaust stream having an ammonia-generating component such as a NOx storage reduction (NSR) catalyst or a lean NOx trap (LNT) catalyst, and an SCR catalyst disposed downstream of the ammonia-generating catalyst. The SCR catalyst can be a molecular sieve having the CHA crystal structure, for example SSZ-13 or SAPO-34, which can be ion-exchanged with copper. The LNT can be layered, having an undercoat washcoat layer comprising a support material, at least one precious metal, and at least one NOx sorbent selected from the group consisting of alkaline earth elements, rare earth elements, and combinations thereof and a top washcoat layer comprising a support material, at least one precious metal, and ceria in particulate form, the top washcoat layer being substantially free of alkaline earth components. The emissions treatment system is advantageously used for the treatment of exhaust streams from diesel engines and lean burn gasoline engines.
Inventors:
Wang, Chun-Zwon
Chung, Xiaorai
Stiebels, Zuzanne
Vent, Claudia
Boors, Samuel, Earl.
Chung, Xiaorai
Stiebels, Zuzanne
Vent, Claudia
Boors, Samuel, Earl.
Application Number:
JP2012503645A
Publication Date:
March 07, 2018
Filing Date:
March 31, 2010
Export Citation:
Assignee:
BASF Corporation
International Classes:
B01J29/76; B01D53/86; B01J23/58; B01J29/74; B01J29/85; B01J35/02; F01N3/023; F01N3/08; F01N3/10; F01N3/28
Domestic Patent References:
| JP2007527314A | ||||
| JP2012518537A | ||||
| JP455174B2 | ||||
| JP2007509933A |
Foreign References:
| WO2008106523A2 | ||||
| WO2008132452A2 |
Attorney, Agent or Firm:
Satoshi Eto