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Metallic foil catalysts allow easier control of composition and microstructure than conventional supported metal catalysts. They are promising catalytic materials for investigating the relationship between microstructures and catalytic properties by controlling the introduction of lattice defects. It was reported that twin boundary defects formed in Au–Al alloy catalysts might be the origin of catalytically active sites. In this study, we focused on Ti–Pd–Ni alloy foils that undergo martensitic transformation and can form twin boundary defects. The relationship between the twin boundary structure and the acetylene hydrogenation properties of Ti–Pd–Ni alloy foils was investigated. The catalytic performance for the acetylene hydrogenation was evaluated using Ti–Pd–Ni alloys (Ti50Pd50, Ti50Pd30Ni20, Ti50Pd20Ni30, Ti50Ni50 (at.%)), which exhibit martensitic transformation temperatures ranging from room temperature to above 500℃. The acetylene conversion rates displayed mountain-shaped curves during both heating and cooling processes for all samples. A decrease in conversion rate was observed during the cooling process compared to the heating process, likely due to a reduction in surface Pd contents caused by the formation of titanium oxides. A high selectivity toward ethylene (>60%) was observed for all samples. However, we did not find clear correlation between catalytic activities and phase changes associated with martensitic transformations, probably because of the influence of titanium oxide formation which changed surface composition and microstructure in Ti–Pd–Ni alloys.

権利情報:

• In Copyright
  

キーワード: Ti–Pd–Ni alloys, foil catalyst, martensitic transformation, twin boundary defect, semi-hydrogenation of acetylene

刊行年月日: 2025-09-01

出版者: Japan Institute of Metals

掲載誌:

• 日本金属学会誌 (ISSN: 00214876) vol. 89 issue. 9 p. 280-286

研究助成金:

• Japan Science and Technology Agency JPMJCR22O3

原稿種別: 出版者版 (Version of record)

MDR DOI:

公開URL: https://doi.org/10.2320/jinstmet.j202515

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更新時刻: 2025-10-21 16:06:46 +0900

MDRでの公開時刻: 2025-10-21 15:43:41 +0900