2023 Fiscal Year Research-status Report
多元素合金を駆使した表面反応場の精密設計と革新的触媒の開発
| Project/Area Number |
23KJ0028
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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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| Keywords | alloy / acetylene |
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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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