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Interaction between soot and stored NOx during operation of LNT Pt–Ba/Al2O3 catalysts

Paper ID Volume ID Publish Year Pages File Format Full-Text
55577 47057 2012 8 PDF Available
Title
Interaction between soot and stored NOx during operation of LNT Pt–Ba/Al2O3 catalysts
Abstract

The interaction of soot with nitrates stored on a model PtBa/Al2O3 LNT catalyst sample is here investigated under realistic conditions, i.e. upon lean/rich cycling in the presence of water and CO2. The presence of soot inhibits the NOx storage capacity of the catalyst during the lean phase at different temperatures, in the range 200–350 °C, but does not affect significantly the regeneration process of the stored nitrates. Simultaneously with the NOx storage, soot is converted to CO2 at temperatures above 300 °C. Soot is oxidized by NO2 formed by NO oxidation on Pt sites, but the participation of the stored nitrates in the soot oxidation is also likely, as pointed out by TPD/TPO experiments showing the occurrence of a surface reaction involving soot and the stored nitrates.

Graphical abstractFigure optionsDownload full-size imageDownload high-quality image (102 K)Download as PowerPoint slideHighlights► Soot inhibits the NOx storage capacity of a model PtBa/Alumina NSR catalyst but does not affect the regeneration process of the stored nitrates. ► Soot is converted to CO2 during NOx storage. ► Soot oxidation is due to NO2 formed by NO oxidation on Pt, but the participation of the stored NOx is also likely.

Keywords
Soot oxidation; DPNR catalysts; Simultaneous NOx and soot removal; Diesel particulate NOx reduction; NSR catalysts
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Interaction between soot and stored NOx during operation of LNT Pt–Ba/Al2O3 catalysts
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Publisher
Database: Elsevier - ScienceDirect
Journal: Catalysis Today - Volume 184, Issue 1, 30 April 2012, Pages 271–278
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