セレノフェン水素化脱セレン反応をプローブとして用いたＣｏ－Ｍｏ硫化物触媒の活性サイト構造と触媒特性の解析

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  • Structure and Catalytic Properties of the Active Sites on Co-Mo Sulfide Catalysts using Selenophene Hydrodeselenium Reaction as a Probe Reaction
  • セレノフェン スイソカ ダツセレン ハンノウ オ プローブ ト シテ モチイタ Co Mo リュウカブツ ショクバイ ノ カッセイ サイト コウゾウ ト ショクバイ トクセイ ノ カイセキ

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Se-S exchange properties of hydrodeselenium (HDSe) reaction of selenophene on Co-Mo sulfide catalysts prepared by a CVD method were investigated on the basis of the amount of exchangeable sulfur atoms per active site and Co K-edge XAFS. The Co K-edge EXAFS for the CVD-Co/MoS2 catalysts after HDSe reaction was analyzed by a curve fitting method. EXAFS analysis revealed a relationship between the coordination numbers of Co-S and Co-Se shells and the number of incorporated selenium atoms per Co (Se/Co). The change of the coordination numbers of Co-S and Co-Se shells during the reaction are compatible with the dinuclear Co-Mo-S model previously proposed from EXAFS analysis and magnetic properties. A linear relationship was observed between the number of exchanged sulfur atoms per Co atom (H2S/Co) and the activity for thiophene HDS reaction, indicating that the HDS activity depends on the amount of exchangeable sulfur atoms in Co-Mo sulfide catalysts. It was also found that the amount of maximum exchangeable sulfur depends on the catalyst support and sulfidation conditions.

収録刊行物

  • 表面科学

    表面科学 30 (7), 380-385, 2009

    公益社団法人 日本表面科学会

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