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Reaction between soot and stored NOX over K-based LNT catalysts investigated by temperature programmed methods and labeling isotopic experiments

Paper ID Volume ID Publish Year Pages File Format Full-Text
55326 47047 2012 8 PDF Available
Title
Reaction between soot and stored NOX over K-based LNT catalysts investigated by temperature programmed methods and labeling isotopic experiments
Abstract

The interaction between NOX stored over K/Al2O3 and Pt-K/Al2O3 catalysts and soot is investigated in this work. TPD and TPO experiments are carried out where the reactivity/thermal decomposition of nitrates is investigated in the presence and in the absence of soot. It is found that the presence of soot favors the decomposition/reduction of the stored nitrates, while soot is being oxidized. Clear indication of the direct participation of the surface nitrates in soot oxidation is obtained, without the requirement of the preliminary thermal decomposition of nitrates. Such a mechanism occurs thanks to the mobility of the adsorbed NOX species and is not promoted by platinum. This surface reaction mechanism parallels the gas-phase soot oxidation by NO2 and O2 evolved upon decomposition of the stored NOX. K-based samples are more active than Ba-containing catalysts due to the higher mobility of the NOX species adsorbed on K with respect to Ba.

Graphical abstractStored NOX are mobile and oxidize soot.Figure optionsDownload full-size imageDownload high-quality image (257 K)Download as PowerPoint slideHighlights► Stored NOX are mobile and oxidize soot. ► Pt does not affect the soot oxidation process by the stored nitrates. ► K-based samples are more active than Ba-containing catalysts due to the higher mobility of the stored NOX species.

Keywords
Soot oxidation; LNT catalysts; DPNR system; Simultaneous NOX and soot removal
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Reaction between soot and stored NOX over K-based LNT catalysts investigated by temperature programmed methods and labeling isotopic experiments
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Publisher
Database: Elsevier - ScienceDirect
Journal: Catalysis Today - Volume 197, Issue 1, 15 December 2012, Pages 228–235
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