Surface Properties of Air-Exposed α-Ti–Pd Alloys via XPS and Cross-Coupling Reaction

Ryota Kondo; Seiya Nakamichi; Ryusei Azuma; Yuya Takahashi; Yasushi Obora; Hiroyuki T. Takeshita

doi:10.2320/matertrans.M2018240

Ryota Kondo, Seiya Nakamichi, Ryusei Azuma, Yuya Takahashi, Yasushi Obora, Hiroyuki T. Takeshita

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Keywords: Ti–Pd alloy, Pd catalyst, cross-coupling reaction

JOURNAL FREE ACCESS FULL-TEXT HTML

2018 Volume 59 Issue 12 Pages 1911-1914

DOI https://doi.org/10.2320/matertrans.M2018240

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Abstract

To identify the reasons why Ti–Pd alloys for hydrogen storage materials show good hydrogenation properties, X-ray photoelectron spectroscopy and the Suzuki–Miyaura cross-coupling reaction were used to investigate a small amount of Pd added Ti–Pd alloys. Pd in or on Ti oxide films is in a valence state of 0 (Pd⁰). Catalytic activity was shown by Pd⁰ in the Suzuki–Miyaura cross-coupling reaction. Therefore, the enhanced hydrogenation properties of Ti–Pd alloys for hydrogen storage materials is due to Pd⁰’s catalytic activity in dissociating hydrogen molecules. In addition, the potential catalytic activity of Ti–Pd alloys was shown to be based on a Pd catalyst.

XPS and cross-coupling reaction (CCR) were used to investigate the surface property of Pd in Ti-Pd alloys. Pd was present in a valence state of 0. Despite the flack-like shape of the alloy, the cross-coupling reaction proceeded up to 94% in product without pretreatment, such as heating in H₂ atmosphere and in air conditions. Fullsize Image

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