~ Visualized and elucidated the NOx purification process
by catalysts at the microscopic level ~
Key Points of This Research
- Focusing on NOx, which is particularly difficult to purify among automobile exhaust gases, we conducted operando measurements¹ by recording, in real time and at the atomic level, structural changes of rhodium nanoparticles during catalytic reactions in NO gas. Simultaneously, we detected time-dependent changes in the quantity of gases being decomposed/produced through mass spectrometry.
- We elucidated, at the atomic level, a series of surface structural changes in nanoparticles associated with the adsorption and decomposition of NO molecules. For the first time, we demonstrated that the catalytic reaction mechanism switches to different modes at low and high temperatures.
Fig. 1 Present RS-HVSTEM-QMS system used in the present study.
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Fig. 2. Structural changes of Rh particles in NO atmosphere at various temperature. (a)300 °C, (b) 500 °C, (c) 700 °C
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Fig. 3. Surface structural change of Rh nano particle at 500℃
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Fig. 4. Mass spectra as functions of temperature.
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Publication info
Journal title： Nano Today
Article title：Operando analysis of dynamic structural changes on Rh nanoparticle surfaces during catalytic reduction of NO using an environmental high-voltage electron microscope–quadrupole mass spectrometer
Authors： L-S. Tang （Nagoya Univ.）、H. Tanaka （Toyota Motor Co.）、S. Arai （Nagoya Univ.）、T. Higuchi （JEOL Inc.）、S. Muto （Nagoya Univ.）
DOI：10.1016/j.nantod.2025.102707
URL：https://www.sciencedirect.com/science/article/pii/S1748013225000799
Correspondence
AMTC, IMaSS, Nagoya Univ.
Prof. Shunsuke Muto
TEL：052-789-5200 FAX：052-789-5137
E-mail: smuto[at]imass.nagoya-u.ac.jp
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