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Sn-modified NOX storage/reduction catalysts

Paper ID Volume ID Publish Year Pages File Format Full-Text
54877 47029 2013 12 PDF Available
Title
Sn-modified NOX storage/reduction catalysts
Abstract

Ba-, K-, and Ba–K-based NOX storage/reduction (NSR) catalysts were prepared, with and without Sn as a promotor. Catalysts and catalyst/soot mixtures were evaluated for NOX reduction and soot oxidation under standard NSR cycling conditions. The activity study was accompanied by dispersion measurements, TEM, XRD, and XPS characterization. It was found that modification with Sn did not significantly influence NOX adsorption, however, Sn notably enhanced soot oxidation for Ba-based systems. This was correlated to Pt oxidation state modification. Also the addition of Sn to the Pt–Ba and Pt–Ba–K catalysts lowered the onset temperature of S release. The Pt–Ba–K catalyst had higher stability against S-poisoning, likely due to the preferential adsorption of S onto K-species, partially maintaining Ba sites for NOX trapping.

Graphical abstractFigure optionsDownload full-size imageDownload high-quality image (267 K)Download as PowerPoint slideHighlights► Sn-promoted standard NSR catalyst showed enhanced soot oxidation. ► The NOX storage capacities were not affected by Sn addition. ► Sn lowered the onset temperature of S release.

Keywords
NOX storage; Lean NOX trap; Pt/Ba/Al2O3; Thermal durability; Sulfur resistance
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Sn-modified NOX storage/reduction catalysts
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Publisher
Database: Elsevier - ScienceDirect
Journal: Catalysis Today - Volume 207, 30 May 2013, Pages 200–211
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