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LNT + in situ SCR catalyst system for diesel emissions control

Paper ID Volume ID Publish Year Pages File Format Full-Text
55557 47057 2012 12 PDF Available
Title
LNT + in situ SCR catalyst system for diesel emissions control
Abstract

An overview is presented of laboratory and vehicle studies conducted at Ford Motor Company on the LNT + in situ SCR catalyst approach to diesel emissions control. Specifically, the paper focuses on results obtained with so-called “2nd-generation” systems developed by Ford's catalyst suppliers since 2007–2008. These systems are characterized by improvements in durability, performance and cost relative to their predecessors. Key features of the 2nd-generation LNT + in situ SCR technology include: (1) lower desulfation temperatures of the LNT, (2) lower LNT platinum group metal (PGM) content than required for LNT-only systems, (3) advanced SCR catalysts of the types used in commercial zeolite-based SCR applications, (4) synergetic coupling of the LNT and SCR catalyst performance to maintain high efficiency after aging, (5) a non-ammonia NOx reduction mechanism over the SCR catalyst in addition to the standard mechanism based on ammonia storage, and (6) improved hydrocarbon oxidation efficiency owing to the SCR catalyst. Taken together, these advances improve the prospect of meeting future emission regulations on light-duty diesel vehicles, but not without considerable challenge to both the aftertreatment system and control strategy for achieving simultaneous low NOx and non-methane hydrocarbon emissions while minimizing fuel consumption.

Graphical abstractFigure optionsDownload full-size imageDownload high-quality image (164 K)Download as PowerPoint slideHighlights► 2nd-generation LNT + in situ SCR catalysts for diesel emissions control. ► LNT has lowered desulfation temperature; Cu-CHA zeolite SCR catalyst. ► SCR catalyst expands LNT temperature window. ► Non-ammonia NOx reduction observed. ► SCR catalyst enhances hydrocarbon conversion.

Keywords
Diesel emissions control; Lean NOx trap; In situ SCR; Non-ammonia NOx reduction; Cu-CHA zeolite; Non-methane hydrocarbon
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LNT + in situ SCR catalyst system for diesel emissions control
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Publisher
Database: Elsevier - ScienceDirect
Journal: Catalysis Today - Volume 184, Issue 1, 30 April 2012, Pages 83–94
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Catalysis
Get Full-Text Now
Don't Miss Today's Special Offer
Price was $35.95
You save - $31
Price after discount Only $4.95
100% Money Back Guarantee
Full-text PDF Download
Online Support
Any Questions? feel free to contact us