Local Structure Analysis of Active Sites in NiO/γ-Al<sub>2</sub>O<sub>3</sub> Catalyst for Dimethyl Sulfide Decomposition: Sulfurization Behavior of Ni Species Using X-ray Absorption Spectroscopy Analysis

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  • SHIMODA Naohiro
    Dept. of Materials and Life Science, Faculty of Science and Technology, Seikei University (Present) Dept. of Applied Chemistry, Tokushima University
  • KOIDE Nao
    Dept. of Materials and Life Science, Faculty of Science and Technology, Seikei University
  • HONMA Tetsuo
    Japan Synchrotron Radiation Research Institute
  • NAKANO Takeo
    Dept. of Materials and Life Science, Faculty of Science and Technology, Seikei University
  • ZHANG Jin
    Panasnic Corp.
  • WAKITA Hidenobu
    Panasnic Corp.
  • SATOKAWA Shigeo
    Dept. of Materials and Life Science, Faculty of Science and Technology, Seikei University

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  • ジメチルスルフィド分解用NiO/γ-Al<sub>2</sub>O<sub>3</sub>触媒の活性サイトの局所構造解析—X線吸収分光分析を用いたNi種の硫化挙動—
  • Local Structure Analysis of Active Sites in NiO/γ-Al₂O₃ Catalyst for Dimethyl Sulfide Decomposition : Sulfurization Behavior of Ni Species Using X-ray Absorption Spectroscopy Analysis

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Abstract

<p>Local structures of Ni species were studied in the NiO/γ-Al2O3 catalyst prepared by the impregnation method for the decomposition of dimethyl sulfide (DMS). Calcination and sulfurization conditions of the prepared catalyst affected the catalytic activity for DMS decomposition. The decomposition performance was increased with sulfurization by H2S compared to sulfurization with DMS prior to the reaction test. X-ray diffraction and X-ray photoelectron spectroscopy analyses indicated that the active sites are NiS. Furthermore, in-situ X-ray absorption spectroscopy analysis was conducted to investigate the fine structural changes of Ni species before and after the sulfurization treatment. For the catalyst calcined at 500 °C, Ni species were present as NiO and NiAl2O4 at a ratio of ca. 4 : 6 and only NiO was sulfurized to NiS which acts as the active sites. In contrast, for the catalyst calcined at 800 °C, Ni species were almost completely present as the Ni component in the NiAl2O4 structure, which is less susceptible to sulfurization than NiO. Therefore, the NiS amount in the catalyst calcined at 800 °C was significantly reduced, leading to lower decomposition activity.</p>

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