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

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Effect of barium loading on the desulfation of Pt-BaO/Al2O3 studied by H-2 TPRX, TEM, sulfur K-edge XANES, and in situ TR-XRD

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Title
Effect of barium loading on the desulfation of Pt-BaO/Al2O3 studied by H-2 TPRX, TEM, sulfur K-edge XANES, and in situ TR-XRD
Other Titles
Effect of barium loading on the desulfation of Pt-BaO/Al2O3 studied by H-2 TPRX, TEM, sulfur K-edge XANES, and in situ TR-XRD
Author
Do Heui KimJanos SzanyiJa Hun KwakTamas SzailerJonathan HansonChong Min WangCharles H. F. Peden
Keywords
NOX STORAGE-REDUCTION; NO(X) STORAGE; CATALYSTS; BAO/AL2O3; DEACTIVATION; SPECTROSCOPY
Issue Date
2006-06
Publisher
AMER CHEMICAL SOC
Citation
JOURNAL OF PHYSICAL CHEMISTRY B, v.110, no.21, pp.10441 - 10448
Abstract
Desulfation processes were investigated over sulfated Pt-BaO/Al2O3 with different barium loading (8 and 20 wt%) by using H-2 temperature programmed reaction (TPRX), transmission electron microscope (TEM) with energy dispersive spectroscopy (EDS), sulfur K-edge X-ray absorption near-edge spectroscopy (XANES), and in situ time-resolved X-ray diffraction (TR-XRD) techniques. Both sulfated samples (8 and 20 wt%) form sulfate species (primarily BaSO4) as evidenced by S K-edge XANES and in situ TR-XRD. However, the desulfation behavior is strongly dependent on the barium loading. Sulfated Pt-BaO(8)/Al2O3,consisting predominantly of surface BaO/BaCO3 species, displays more facile desulfation by H-2 at lower temperatures than sulfated Pt-BaO(20)/Al2O3, a material containing primarily bulk BaO/BaCO3 species. Therefore, after desulfation with H-2 up to 1073 K, the amount of the remaining sulfur species on the former, mostly as BaS, is much less than that on the latter. This suggests that the initial morphology differences between the two samples play a crucial role in determining the extent of desulfation and the temperature at which it occurs. It is concluded that the removal of sulfur is significantly easier at lower barium loading. This finding can potentially be important in developing more sulfur resistant LNT catalyst systems
URI
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DOI
10.1021/jp060119f
ISSN
1520-6106
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ECHE_Journal Papers
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