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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.

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Keyword: Ti–Pd–Ni alloys, foil catalyst, martensitic transformation, twin boundary defect, semi-hydrogenation of acetylene

Date published: 2025-09-01

Publisher: Japan Institute of Metals

Journal:

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

Funding:

• Japan Science and Technology Agency JPMJCR22O3

Manuscript type: Publisher's version (Version of record)

MDR DOI:

First published URL: https://doi.org/10.2320/jinstmet.j202515

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Updated at: 2025-10-21 16:06:46 +0900

Published on MDR: 2025-10-21 15:43:41 +0900