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

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Characteristics of Pt-K/MgAl2O4 lean NOx trap catalysts

Cited 11 times inthomson ciCited 10 times inthomson ci
Title
Characteristics of Pt-K/MgAl2O4 lean NOx trap catalysts
Other Titles
Characteristics of Pt-K/MgAl2O4 lean NOx trap catalysts
Author
Kim, Do HeuiMudiyanselage, K.Szanyi, J.Zhu, H.Kwak, JahunPeden, Charles H. F.
Keywords
Pt-K/MgAl2O4; Lean NOx trap catalyst; MgAl2O4 support; FTIR; K loading; Durability
Issue Date
2012-04
Publisher
ELSEVIER SCIENCE BV
Citation
CATALYSIS TODAY, v.184, no.1, pp.2 - 7
Abstract
We report the various characteristics of Pt-K/MgAl2O4 lean NOx trap (LNT) catalysts including the effect of K loading on nitrate formation/decomposition, NOx storage activity, and durability. This work provides results aimed at developing a fundamental understanding of this new class of LNT catalysts, which could be good candidates for high temperature engine exhaust NOx removal applications. Upon the adsorption of NO2 on K/MgAl2O4 samples, potassium nitrates, formed at Mg-related sites on the MgAl2O4 support material surface, are observed in addition to the two (ionic and bidentate) potassium nitrate species observed to form on Al2O3-supported samples. Based on NO2 TPD and FTIR results, the Mg-bound KNO3 species thermally decompose at higher temperatures than Al-bound KNO3, implying its superior thermal stability. At a potassium loading of 5 wt% on MgAl2O4, the temperature of maximum NOx uptake (T-max) is 300 degrees C. Increasing the potassium loading from 5 wt% to 10 wt% results in a monotonic shift in the T-max to 450 degrees C, demonstrating an unexpectedly significant dependence of T-max on the potassium loading. Further increases in potassium loading above 10 wt%, however, only give rise to a reduction in the overall NOx storage capacity. This work also highlights the obstacles to the implementation of these materials for practical applications associated with their durability and sulfur poisoning/removal. (C) 2011 Elsevier B.V. All rights reserved
URI
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DOI
10.1016/j.cattod.2011.11.024
ISSN
0920-5861
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ECHE_Journal Papers
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