Invention Grant
US09358503B2 Emissions treatment system with ammonia-generating and SCR catalysts
有权
具有氨生成和SCR催化剂的排放处理系统
- Patent Title: Emissions treatment system with ammonia-generating and SCR catalysts
- Patent Title (中): 具有氨生成和SCR催化剂的排放处理系统
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Application No.: US14274300Application Date: 2014-05-09
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Publication No.: US09358503B2Publication Date: 2016-06-07
- Inventor: Chung-Zong Wan , Xiaolai Zheng , Susanne Stiebels , Claudia Wendt , Torsten Neubauer , R. Samuel Boorse
- Applicant: BASF Corporation
- Applicant Address: US NJ Florham Park
- Assignee: BASF Corporation
- Current Assignee: BASF Corporation
- Current Assignee Address: US NJ Florham Park
- Agency: Womble Carlyle Sandridge & Rice, LLP
- Main IPC: B01D50/00
- IPC: B01D50/00 ; B01D53/94 ; F01N3/035 ; F01N3/08 ; F01N3/20 ; F01N3/10 ; F01N13/02

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.
Public/Granted literature
- US20140248200A1 Emissions Treatment System with Ammonia-Generating and SCR Catalysts Public/Granted day:2014-09-04
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