Effect of Ceria on the Storage and Regeneration Behavior of a Model Lean NOx Trap Catalyst

Journal Article · Mon Jan 01 04:00:00 EST 2007 · Catalysis Letters

DOI:https://doi.org/10.1007/s10562-007-9226-2· OSTI ID:932094

Ji, Yaying ^[1]; Toops, Todd J ^[2]; Crocker, Dr. Mark ^[3]

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1. CAER-UK
2. ORNL
3. University of Kentucky, Lexington

In this study the effect of ceria addition on the performance of a model Ba-based lean NO{sub x} trap (LNT) catalyst was examined. The presence of ceria improved NO{sub 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{sub x} stored in the ceria-containing catalyst was thermally less stable and more reactive to reduction with both H{sub 2} 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{sub x} storage efficiency but also positively impacts LNT regeneration behavior.

• Research Organization: Oak Ridge National Laboratory (ORNL); Fuels, Engines and Emissions Research Center
• Sponsoring Organization: ME USDOE - Office of Management, Budget, and Evaluation; ORNL work for others
• DOE Contract Number: AC05-00OR22725
• OSTI ID: 932094
• Journal Information: Catalysis Letters, Journal Name: Catalysis Letters Journal Issue: 3-4 Vol. 119; ISSN CALEER; ISSN 1011-372X
• Country of Publication: United States
• Language: English

Related Subjects

54 ENVIRONMENTAL SCIENCES
AIR POLLUTION CONTROL
CATALYSTS
CATALYTIC EFFECTS
CERIUM OXIDES
NITROGEN OXIDES
PERFORMANCE
REDUCTION
REGENERATION