2022 Fiscal Year Final Research Report
Ambient-Pressure synchrotron X-ray study to reveal atomic-scale mechanism of CO oxidation and three-way catalytic reaction of Ru based solid-solution nanoparticles
| Project/Area Number |
20K15083
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| Research Category |
Grant-in-Aid for Early-Career Scientists
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| Allocation Type | Multi-year Fund |
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| Review Section |
Basic Section 27020:Chemical reaction and process system engineering-related
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| Research Institution | Japan Synchrotron Radiation Research Institute (2021-2022)
National Institute for Materials Science (2020) |
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Principal Investigator |
Seo Okkyun 公益財団法人高輝度光科学研究センター, 産業利用・産学連携推進室, テニュアトラック研究員 (30814206)
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| Project Period (FY) |
2020-04-01 – 2023-03-31
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| Keywords | AP-XPS / in-situ XAFS / metal nanoparticles / CO oxidation / H2 absorption / three-way catalysts |
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| Outline of Final Research Achievements |
The purification of NO, CO, and C3H6 gases from automobile is accomplished by combining precious metals, Rh, Pd, and Pt, called three-way catalysts. This study results from studying thermal stability by synthesizing PdRuIr NPs by reducing expensive metals of Rh with cheaper ones. Ru exhibits a high redox but has the characteristic of evaporating while being oxidized at a high temperature. By measuring XAFS, it was explained that Ru is strongly combined with Pd and Ir to reduce evaporation.
To understand the hydrogen adsorption and hydride process, XAFS and AP-XPS were performed. As a result of measuring Pd and PdPt NPs, it was found that the Pd plays an essential role in hydrogen adsorption. To obtain an electronic structure similar to that of Pd, AgRh solid-solution NPs made by mixing Ag and Rh located on the left and right sides of Pd were synthesized. A phenomenon in which hydrogen is adsorbed to two metals that are known not to adsorb hydrogen was discovered.
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| Free Research Field |
Synchrotron X-ray analysis techniqes
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| Academic Significance and Societal Importance of the Research Achievements |
Metal NPs are promising materials for hydrogen adsorption and three-way catalysts. Despite its excellent properties, research on the mechanisms occurring within it is still lacking. This is meaningful in understanding the behavior of metal NPs in an operating by utilizing in-situ X-ray techniques.
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