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 [in Japanese] Structure and Catalytic Properties of the Active Sites on Co-Mo Sulfide Catalysts using Selenophene Hydrodeselenium Reaction as a Probe Reaction [in Japanese]
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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/MoS<SUB>2</SUB> 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 (H<SUB>2</SUB>S/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.
- Hyomen Kagaku
Hyomen Kagaku 30(7), 380-385, 2009-07-10
The Surface Science Society of Japan