2021 Fiscal Year Research-status 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 Institution | Japan Synchrotron Radiation Research Institute |
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Principal Investigator |
徐 玉均 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 | H absorption / CO oxidation / three-way catalysts / EXAFS / AP-XPS |
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| Outline of Annual Research Achievements |
Atomic behaviors of the binary metal nanoparticles under reaction conditions are critical parameters for understanding the reaction mechanism and designing the new catalysts. During the oxidation and reduction reaction of the Ru-based binary metal nanoparticles, I confirmed that the Ru atoms are preferentially segregated to the surface part using the ambient pressure X-ray photoelectron spectroscopy and in-situ X-ray absorption fine structure. It means that the Ru atoms are the main role in the surface reaction. Our results on the reaction pathway of CO oxidation and three-way catalysts by Ru-based nanoparticles CZ provide an experimental guideline on the design of the catalytic metal NPs and metal NPs-supported oxide.
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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
During the research project period, I have successfully been performing the synchrotron X-ray experiments, which are in-situ X-ray absorption fine structure and ambient pressure X-ray photoelectron spectroscopy under reaction conditions in SPring-8 and Pohang Accelerator Laboratory in KOREA.
Through the analytic results of the in-situ X-ray experiment, I have submitted 1 research manuscript related to the three-way catalysts of PdRu nanoparticles supported on CeO2-ZrO2. In addition, I am preparing the research manuscript for the CO oxidation reaction of Pd-Ru nanoparticles and Pt-Ru nanoparticles.
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| Strategy for Future Research Activity |
Platinum group metals (PGMs) of five elements as ruthenium (Ru), rhodium (Rh), palladium (Pd), iridium (Ir), and platinum (Pt) are important for oxidation and reduction reactions. PGMs have excellent properties for catalysts such as high melting point, high heat resistance, and high corrosion resistance. Because of these properties, PGM is widely used in many industries, especially as automotive exhaust catalysts. High entropy alloys (HEAs), defined as at least five elements in near-equiatomic concentrations, facilitate the discovery of new materials and phenomena. The configurational entropy of metals increases with an increasing number of elements, known as the high entropy effect, which can decisively enhance material stability.
Therefore, we are planning to perform the synchrotron X-ray techniques (in-situ X-ray absorption fine structure and ambient pressure X-ray photoelectron spectroscopy) of HEA nanoparticles to reveal the thermal stability under reaction conditions.
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| Causes of Carryover |
Because of the Corona pandemic issue, I didn't go to synchrotron X-ray experiments. And the experimental instruments will purchase in the next fiscal year of 2022.
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