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

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Effect of reductive treatments on Pt behavior and NOx storage in lean NOx trap catalysts

Cited 2 times inthomson ciCited 2 times inthomson ci
Title
Effect of reductive treatments on Pt behavior and NOx storage in lean NOx trap catalysts
Other Titles
Effect of reductive treatments on Pt behavior and NOx storage in lean NOx trap catalysts
Author
Wang, XianQinKim, Do HeuiKwak, JahunWang, ChongminSzanyi, JanosPeden, Charles H. F.
Keywords
SUPPORT INTERACTION SMSI; IN-SITU FTIR; STORAGE/REDUCTION CATALYSTS; METAL; MECHANISM; BAO/AL2O3; DEACTIVATION; PT/BAO/AL2O3; TEMPERATURE; PERFORMANCE
Issue Date
2011-10
Publisher
ELSEVIER SCIENCE BV
Citation
CATALYSIS TODAY, v.175, no.1, pp.78 - 82
Abstract
Lean NOx trap (LNT) catalysts represent a promising approach to meet increasingly stringent NOx emission regulations on diesel and other lean-burn engines. Pt material properties, including dispersion and particle size, are known to be important factors in determining NOx uptake performance, since Pt provides active sites for NO oxidation to NO2 necessary for storing NOx as nitrates, and for the reduction of nitrates to N-2. In this work, the physicochemical properties of Pt in Pt-BaO/Al2O3 LNT catalysts, such as the Pt accessible surface area and particle size, were investigated by using various tools, such as irreversible volumetric H-2 chemisorption, high resolution transmission electron microscopy (HRTEM), and X-ray diffraction (XRD), following successive reductive treatments at elevated temperatures. NOx uptake activities were also measured to establish a relationship between the properties of Pt and NOx storage following identical high-temperature reductive treatments. We find that the reductive treatments of Pt-BaO/Al2O3 lean NOx trap catalysts at temperatures up to 500 degrees C promote a significant increase in NOx uptake explained, in part, by an induced close interaction between Pt and BaO phases in the catalyst, thus enabling facilitation of the NOx storage process. (C) 2011 Published by Elsevier B.V
URI
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DOI
10.1016/j.cattod.2011.03.032
ISSN
0920-5861
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ECHE_Journal Papers
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