| Project/Area Number |
13450334
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| Research Category |
Grant-in-Aid for Scientific Research (B)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
触媒・化学プロセス
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| Research Institution | Shimane University |
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Principal Investigator |
OKAMOTO Yasuaki Interdisciplinary Faculty of Science and Engineering, Shimane University, Professor, 総合理工学部, 教授 (80029553)
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| Co-Investigator(Kenkyū-buntansha) |
BANDO Kyoko National Institute of Advanced Industrial Science and Technology (AIST), 機能表面化学部, 研究員
KUBOTA Takashi Interdisciplinary Faculty of Science and Engineering, Shimane University, Assistant, 総合理工学部, 助手 (90304253)
坂東 恭子 産業技術総合研究所, 環境調和技術研究部門, 研究員
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| Project Period (FY) |
2001 – 2002
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| Project Status |
Completed (Fiscal Year 2002)
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| Budget Amount *help |
¥6,400,000 (Direct Cost: ¥6,400,000)
Fiscal Year 2002: ¥1,300,000 (Direct Cost: ¥1,300,000)
Fiscal Year 2001: ¥5,100,000 (Direct Cost: ¥5,100,000)
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| Keywords | XAFS / Hydrodesufurization / Co-Mo catalyst / Ni-Mo catalsyt / Co-W catalyst / Ni-W catalyst / Thiphene / NTA / in-situキャラクタリゼーョン / Co-Mo硫化物触媒 / 水素化脱硫反応 |
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| Research Abstract |
The local structures of Co and Ni in Co-W and Ni-W sulfide catalysts are studied by means of an in situ fluorescence XAFS technique. The structural changes of Co and Ni with the reaction atmosphere and temperature and the effects of the addition of a chelating agent on the sulfidability of Co and Ni are discussed. In the absence of a chelating agent, sulfidation of Co and Ni rapidly proceeded with increasing temperature and almost completed at 473K. On the other hand, the Co and Ni species of Co-W/Al_2O_3 and Ni-W/Al_2O_3 catalysts with nitrilotriacetic acid (NTA) were scarcely sulfided at room temperature. Furthermore, XANES analysis revealed that the rate of sulfidation was significantly suppressed in the presence of NTA even at a higher temperature. It was also found that the catalytic activity of Co-W/Al_2O_3 for thiophene hydrodesulfurization was improved more significantly by the addition of NTA than that of Ni-W/Al_2O_3. It is demonstrated from the XANES analysis that the formation of bulk Co sulfide species is considerably suppressed in the NTA-added Co-W catalyst.
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