Characterization of CoMo-Al2O3 Catalyst by Combination Technique of Temperature-programmed Sulfiding and Electron Spin Resonance(TPS-ESR).

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  • HAYASHI Eiji
    Research Institute, King Fahd University of Petroleum and Minerals
  • IWAMATSU Eiji
    Research Institute, King Fahd University of Petroleum and Minerals
  • AHMED Shakeel
    Research Institute, King Fahd University of Petroleum and Minerals
  • LEE Augustine K.K.
    Research Institute, King Fahd University of Petroleum and Minerals
  • HAMID Halim
    Research Institute, King Fahd University of Petroleum and Minerals
  • SANADA Yuzo
    Research Institute, King Fahd University of Petroleum and Minerals
  • YONEDA Toshikazu
    Advanced Catalysts Research Laboratory, Petroleum Energy Center

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  • 昇温硫化-ESR併用法 (TPS-ESR法) を用いたCoMo-Al<sub>2</sub>O<sub>3</sub>触媒のキャラクタリゼーション
  • Characterization of CoMo-Al2O3 Catalyst

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Abstract

CoMo-Al2O3 catalyst was characterized with a combination technique of temperature-programmed sulfiding (TPS) and electron spin resonance (ESR). The behavior of the MoO3 loaded over the surface of Al2O3 obtained from TPS has been compared with that of Mo5+ observed with ESR at isothermal and elevated temperatures. The Mo6+ in the MoO3 supported is easily reduced with H2S+H2 under very mild conditions and transformed into Mo5+ as an intermediate. This Mo5+ peak drastically decreased around 200°C with H2S desorption, and H2 consumption appeared simultaneously in the TPS profile. These results suggest that the Mo5+ species observed with ESR associates with sulfur from H2S.

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