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Axial length effects on Lean NOx Trap performance

Paper ID Volume ID Publish Year Pages File Format Full-Text
47508 46474 2009 8 PDF Available
Title
Axial length effects on Lean NOx Trap performance
Abstract

The effect of axial length on the NOx reduction performance of two different commercial Lean NOx Trap (LNT) monolithic catalysts was experimentally investigated in a bench flow reactor. The washcoat composition of one of the catalysts consisted of Pt and K on γ-Al2O3; whereas the other catalyst contained a complex mixture of Pt, Pd, Rh, Ba, Ce, Zr, Mg, Al and others. The NOx removal characteristics of cylindrical monolith segments of constant diameter (2.22 cm) and axial lengths of 2.54, 5.08 and 7.62 cm were evaluated using a simulated lean engine exhaust containing water and carbon dioxide at a constant space velocity of 30,000 h−1. No significant effects of length were observed when the catalysts were fully reduced with hydrogen between NOx capture phases. However when the catalysts were only partially regenerated NOx reduction efficiency increased with monolith length. Intra-catalyst H2 measurements at different axial locations indicated that at least some of the efficiency loss during partial regeneration occurred when back-mixed H2 was directly oxidized and became unavailable for nitrate reduction.

Keywords
Lean NOx Trap (LNT); NOx storage/reduction; NSR; Size effect; Gas hourly space velocity; Back-mixing
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis B: Environmental - Volume 92, Issues 1–2, 19 October 2009, Pages 9–16
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