Analysis of d-Electron State of Platinum Salts on Silica During Thermal Decomposition by a Laboratory-type X-ray Absorption Spectrometer – Choice of Parameters for <i>in situ</i> Experiments –

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  • YAMAMOTO Takashi
    Department of Regional Science, Graduate School of Integrated Arts and Sciences, The University of Tokushima Department of Mathematical and Material Sciences, Faculty of Integrated Arts and Sciences, The University of Tokushima
  • MIYAMOTO Kazunori
    Department of Regional Science, Graduate School of Integrated Arts and Sciences, The University of Tokushima
  • KONDO Masaya
    Department of Mathematical and Material Sciences, Faculty of Integrated Arts and Sciences, The University of Tokushima
  • YUKUMOTO Akira
    Department of Regional Science, Graduate School of Integrated Arts and Sciences, The University of Tokushima

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Other Title
  • 実験室系XAFS装置によるシリカ担持白金触媒前駆体のその場測定条件の検討及び熱分解過程での白金5d軌道空孔密度分析
  • アナリティカルレポート 実験室系XAFS装置によるシリカ担持白金触媒前駆体のその場測定条件の検討及び熱分解過程での白金5d軌道空孔密度分析
  • アナリティカルレポート ジッケンシツケイ XAFS ソウチ ニ ヨル シリカタンジハッキン ショクバイ ゼンクタイ ノ ソノ バ ソクテイ ジョウケン ノ ケントウ オヨビ ネツ ブンカイ カテイ デ ノ ハッキン 5d キドウ クウコウ ミツド ブンセキ
  • Analysis of d-Electron State of Platinum Salts on Silica During Thermal Decomposition by a Laboratory-type X-ray Absorption Spectrometer &ndash; Choice of Parameters for <i>in situ</i> Experiments &ndash;

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Abstract

The decomposition behavior of H2PtCl6 or Pt(NH3)4Cl2 supported on amorphous silica was investigated by X-ray absorption near edge spectroscopy using a laboratory-type spectrometer. The choice of a monochromator crystal, the slit width and the acquisition time for in situ measurements of catalyst samples is discussed. The whiteline intensities at the Pt L3 edge XANES did not always reflect on the oxidation state of the platinum species, but on the d-orbital occupancy, as pointed out previously. The changing behavior of the Pt d-orbital occupancy of platinum species on silica upon a thermal treatment in air was evaluated by Pt L2,3 edge XANES with Mansour’s method. Metallic platinum formed on silica after calcination at 773 K under air, but cationic platinum species were suggested to have remained.

Journal

  • BUNSEKI KAGAKU

    BUNSEKI KAGAKU 64 (12), 889-894, 2015

    The Japan Society for Analytical Chemistry

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