Effect of ceria on the storage and regeneration behavior of a model lean NO x trap catalyst

Yaying Ji; Todd J. Toops; Mark Crocker

doi:10.1007/s10562-007-9226-2

Effect of ceria on the storage and regeneration behavior of a model lean NO _x trap catalyst

Yaying Ji
, Todd J. Toops
, Mark Crocker

Research output: Contribution to journal › Article › peer-review

70 Scopus citations

Abstract

In this study the effect of ceria addition on the performance of a model Ba-based lean NO _x trap (LNT) catalyst was examined. The presence of ceria improved NO _x storage capacity in the temperature range 200-400 °C under both continuous lean and lean-rich cycling conditions. Temperature-programmed experiments showed that NO _x stored in the ceria-containing catalyst was thermally less stable and more reactive to reduction with both H₂ and CO as reductants, albeit at the expense of additional reductant consumed by reduction of the ceria. These findings demonstrate that the incorporation of ceria in LNTs not only improves NO _x storage efficiency but also positively impacts LNT regeneration behavior.

Original language	English
Pages (from-to)	257-264
Number of pages	8
Journal	Catalysis Letters
Volume	119
Issue number	3-4
DOIs	https://doi.org/10.1007/s10562-007-9226-2
State	Published - Dec 2007

Funding

Acknowledgments This publication was prepared with the support of the U.S. Department of Energy, under Award No. DE-FC26– 05NT42631. However, any opinions, findings, conclusions, or recommendations expressed herein are those of the authors and do not necessarily reflect the views of the DOE.

Keywords

Ceria
LNT
NO
Reduction
Storage

Access to Document

10.1007/s10562-007-9226-2

Cite this

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abstract = "In this study the effect of ceria addition on the performance of a model Ba-based lean NO x trap (LNT) catalyst was examined. The presence of ceria improved NO x storage capacity in the temperature range 200-400 °C under both continuous lean and lean-rich cycling conditions. Temperature-programmed experiments showed that NO x stored in the ceria-containing catalyst was thermally less stable and more reactive to reduction with both H2 and CO as reductants, albeit at the expense of additional reductant consumed by reduction of the ceria. These findings demonstrate that the incorporation of ceria in LNTs not only improves NO x storage efficiency but also positively impacts LNT regeneration behavior.",

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T1 - Effect of ceria on the storage and regeneration behavior of a model lean NO x trap catalyst

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AU - Toops, Todd J.

AU - Crocker, Mark

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N2 - In this study the effect of ceria addition on the performance of a model Ba-based lean NO x trap (LNT) catalyst was examined. The presence of ceria improved NO x storage capacity in the temperature range 200-400 °C under both continuous lean and lean-rich cycling conditions. Temperature-programmed experiments showed that NO x stored in the ceria-containing catalyst was thermally less stable and more reactive to reduction with both H2 and CO as reductants, albeit at the expense of additional reductant consumed by reduction of the ceria. These findings demonstrate that the incorporation of ceria in LNTs not only improves NO x storage efficiency but also positively impacts LNT regeneration behavior.

AB - In this study the effect of ceria addition on the performance of a model Ba-based lean NO x trap (LNT) catalyst was examined. The presence of ceria improved NO x storage capacity in the temperature range 200-400 °C under both continuous lean and lean-rich cycling conditions. Temperature-programmed experiments showed that NO x stored in the ceria-containing catalyst was thermally less stable and more reactive to reduction with both H2 and CO as reductants, albeit at the expense of additional reductant consumed by reduction of the ceria. These findings demonstrate that the incorporation of ceria in LNTs not only improves NO x storage efficiency but also positively impacts LNT regeneration behavior.

KW - Ceria

KW - LNT

KW - NO

KW - Reduction

KW - Storage

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