| 研究実績の概要 |
We studied an interaction model between hydrogen and the Pd NPs during H2 absorption and diffusion to provide new insights into the hydrogen absorption process. We found that more hydrogen atoms were absorbed in the subsurface of the smaller-sized Pd NPs owing to the enhancement of the diffusivity of H atoms from the surface into the subsurface rather than the adsorption or absorption rates at the initial stages. These results were published by the Appl. Surf. Sci.. We have submitted two papers of the CO oxidation and the three-way catalysts of the PdRu NPs and PdRu NPs on CZ to the research journal. The reviewers requested additional experiments, so we are preparing the performance tests of CO oxidation and in-situ XAFS experiments. After obtaining these results, the manuscript will be revised and submitted it to the journal.
As the Pandemic issue was resolved in 2022, overseas experiments became possible. So, I visited the Pohang Accelerator Laboratory to conduct the AP-XPS experiments in 2022 Dec. We found that the CO oxidation reaction of RuPt fcc and hcp structures occurred reaction temperature at 50 and 70 deg, which are the relatively lower reaction temperature as Ru-based catalysts for CO oxidation. Therefore, we performed the CO oxidation behavior according to the RuPt fcc and hcp structures using AP-XPS to investigate the atomic behaviors of RuPt NPs. Surface oxidation of Ru atoms started as Ru migrated to the surface before CO oxidation occurred under the CO+O2 gas condition. As CO oxidation occurs, the surface oxidation of Ru is changed to bulk oxidation.
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