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Kwak, Ja Hun
Molecular Catalysis lab
Research Interests
  • Heterogeneous catalysis, molecular catalysis, ASlumima, zeolites

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Promotional effects of H(2)O treatment on NO(x) storage over fresh and thermally aged Pt-BaO/Al(2)O(3) lean NO(x) trap catalysts

Cited 12 times inthomson ciCited 12 times inthomson ci
Title
Promotional effects of H(2)O treatment on NO(x) storage over fresh and thermally aged Pt-BaO/Al(2)O(3) lean NO(x) trap catalysts
Other Titles
Promotional effects of H(2)O treatment on NO(x) storage over fresh and thermally aged Pt-BaO/Al(2)O(3) lean NO(x) trap catalysts
Author
Kim, Do HeuiChin, Ya-HueiKwak, JahunPeden, Charles H. F.
Keywords
SORPTION/DESORPTION PROCESSES; PARTICLE-SIZE; NO(X) STORAGE; REDUCTION; BAO/AL2O3; MECHANISM; REMOVAL; RELEASE
Issue Date
2008-08
Publisher
SPRINGER
Citation
CATALYSIS LETTERS, v.124, no.1-2, pp.39 - 45
Abstract
A simple liquid water treatment applied to fresh and thermally aged Pt(2 wt%)-BaO(20 wt%)/Al(2)O(3) lean NO(x) trap catalysts at room temperature induces morphological and structural changes in the barium species as followed by XRD and TEM analysis. During the water treatment, liquid water sufficient to fill the catalyst pore volume is brought into contact with the samples. It was found that irrespective of the original barium chemical state (highly dispersed BaO or crystalline BaAl(2)O(4)), exposing the sample to this liquid water treatment promotes the formation of BaCO(3) crystallites (about 15-25 nm of its size) without changing the Pt particle size. Such transformations of the barium species are found to significantly promote NO(x) uptake from 250 to 450 C. The increase in the NO(x) uptake for the water-treated samples can be attributed to an enhanced Pt-Ba interaction through the redistribution of barium species. These results provide useful information for the regeneration of aged lean NO(x) trap catalysts since water is plentiful in the exhaust of diesel or lean-burn engines
URI
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DOI
10.1007/s10562-008-9505-6
ISSN
1011-372X
Appears in Collections:
ECHE_Journal Papers
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