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NOx storage and reduction properties of model ceria-based lean NOx trap catalysts

Paper ID Volume ID Publish Year Pages File Format Full-Text
46651 46444 2012 14 PDF Available
Title
NOx storage and reduction properties of model ceria-based lean NOx trap catalysts
Abstract

Three kinds of model ceria-containing LNT catalysts, corresponding to Pt/Ba/CeO2, Pt/CeO2/Al2O3 and Pt/BaO/CeO2/Al2O3, were prepared for comparison with a standard LNT catalyst of the Pt/BaO/Al2O3 type. In these catalysts ceria functioned as a NOx storage component and/or a support material. The influence of ceria on the microstructure of the catalysts was investigated, in addition to the effect on NOx storage capacity, regeneration behavior and catalyst performance during lean/rich cycling. The Pt/Ba/CeO2 and Pt/BaO/CeO2/Al2O3 catalysts exhibited higher NOx storage capacity at 200 and 300 °C relative to the Pt/BaO/Al2O3 catalyst, although the latter displayed better storage capacity at 400 °C. Catalyst regeneration behavior at low temperature was also improved by the presence of ceria, as reflected by TPR measurements. These factors contributed to the superior NOx storage-reduction performance exhibited by the Pt/Ba/CeO2 and Pt/BaO/CeO2/Al2O3 catalysts under cycling conditions in the temperature range 200–300 °C. Overall, Pt/BaO/CeO2/Al2O3 (which displayed well balanced NOx storage and regeneration behavior), showed the best performance, affording consistently high NOx conversion levels in the temperature range 200–400 °C under lean-rich cycling conditions.

Graphical abstractFigure optionsDownload full-size imageDownload as PowerPoint slideHighlights► Model BaO- and CeO2-containing LNT catalysts were prepared. ► The use of ceria as a support was beneficial for the dispersion of BaO. ► The presence of ceria improved catalyst regeneration at low temperature. ► Ceria was beneficial for NOx storage capacity at 200 °C and 300 °C. ► A Pt/BaO/CeO2/Al2O3 catalyst showed the best performance during lean-rich cycling.

Keywords
Ceria; Barium; Lean NOx trap catalyst; Storage; Reduction
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NOx storage and reduction properties of model ceria-based lean NOx trap catalysts
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis B: Environmental - Volumes 119–120, 30 May 2012, Pages 183–196
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