Materials Transactions Online

Materials Transactions, Vol.58 No.05 (2017) pp.776-781
© 2017 The Japan Institute of Metals and Materials

Hydrogenation of Propyne Verifying the Harmony in Surface and Bulk Compositions for Fe-Ni Alloy Nanoparticles

Takayuki Kojima1, 2, Shun Fujieda2, Genichiro Kato2, Satoshi Kameoka2, Shigeru Suzuki2 and An-Pang Tsai2

1Frontier Research Institute for Interdisciplinary Sciences, Tohoku University, Sendai 980-8578, Japan
2Institute of Multidisciplinary Research for Advanced Materials, Tohoku University, Sendai 980-8577, Japan

We investigated the catalytic properties of Fe1−xNix nanoparticles prepared by a polyol-based method that allowed the precise control of their composition and structure. In the hydrogenation of propyne, the reaction rate decreased with decreasing x, which was in good agreement with the scenario that inactive Fe atoms dilute active Ni ensembles in particles at 0.55 ≤ x ≤ 1. For particles with x ≤ 0.46, it was suggested that slightly active Fe-Ni ensembles mainly contributed to the activity due to small population of active Ni ensembles. Since the change in catalytic properties with x was well explained by the assumption that the surface composition corresponded to x, it was concluded that the surface composition dominating the catalytic properties can be tuned by adjusting the entire composition of nanoparticles.

[doi:10.2320/matertrans.MBW201606]

(Received 2016/11/17; Accepted 2017/02/06; Published 2017/04/25)

Keywords: nanoparticle, surface composition, catalysis, iron-nickel

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