| Project/Area Number |
23KJ0028
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| Research Category |
Grant-in-Aid for JSPS Fellows
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| Allocation Type | Multi-year Fund |
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| Section | 国内 |
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| Review Section |
Basic Section 27030:Catalyst and resource chemical process-related
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| Research Institution | Osaka University |
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Principal Investigator |
MA JIAMIN 大阪大学, 大学院工学研究科, 特別研究員(PD)
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| Project Period (FY) |
2023-04-25 – 2025-03-31
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| Project Status |
Granted (Fiscal Year 2023)
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| Budget Amount *help |
¥2,000,000 (Direct Cost: ¥2,000,000)
Fiscal Year 2024: ¥1,000,000 (Direct Cost: ¥1,000,000)
Fiscal Year 2023: ¥1,000,000 (Direct Cost: ¥1,000,000)
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| Keywords | alloy / acetylene |
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| Outline of Research at the Start |
初期段階では、触媒の有効元素とその 量を決定し、最適な組成比を探索する。最適な合金組成が 決定したら、種々のキャラクタリゼーション（により合金構造の確認を精密に行う 。次に、反応機構に関する研究を行い、各元素の役割を明らかにすることで、当初の設計指針の妥当性・汎用性を検証する。「組成金属」と「ハイエントロピー化」の必要性も検証する。さらに、実験的解析とDFT 計算との組み合わせにより、上記で得られた反応機構の妥当性について理論的なサポートを得る。最後に、論文執筆と並行して、得られた知見を元に高性能な触媒の設計へとフィードバックし、新たな研究シーズの探索も行う。
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| Outline of Annual Research Achievements |
I successfully applied a catalyst design concept based on a pseudo-binary alloy for the fine-tuning of the active property. A series of (Ni1－xCux)3Ga/TiO2 catalysts exhibiting L12-type pseudo-binary alloy structures with various Cu contents were prepared for active site tuning. The optimal catalyst, (Ni0.8Cu0.2)3Ga/TiO2, exhibited outstandingly high catalytic activity among reported 3d transition metal-based systems and excellent ethylene selectivity (96%) and long-term stability (100 h) with near full conversion even at 150°C. It revealed that Ni2Cu hollow sites on the (111) surface weakened the strong adsorption of acetylene and vinyl adsorbate, which significantly accelerated the hydrogenation process and inhibited undesired ethane formation.
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| Current Status of Research Progress |
Current Status of Research Progress
1: Research has progressed more than it was originally planned.
Reason
We were able to characterise the structure of the material because we had sufficient funding support from JSPS, which helped us very much to get the best performing catalysts quickly.
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| Strategy for Future Research Activity |
As we all know, some 3d-transition metals are potential candidates for CO2 hydrogenation but they are essentially immiscible at equilibrium due to the positive enthalpies of formation of their solid solution alloys. However, this can be obtained by HEA because the number of elements increase. Therefore, the value of entropy increases. Then, the Gibbs free energy decrease, promoting the formation of solid solution. Besides, high mixing entropy leads to enhanced stability at high temperature.
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