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One-Step Synthesis of a High Performance Pt-Fe3O4 Catalyst: Intermetallic Al13Fe4 as a Platform and Precursor

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Abstract

A one-step process was developed to prepare catalysts with monodispersed Pt nanocrystals on Fe3O4, based on leaching of the intermetallic compounds Al76.5−xFe23.5Ptx (at%: x = 0, 0.05, 0.5, 1) with an aqueous 10 wt% NaOH solution. In this process, the intermetallic Al13Fe4 lattice acts as a platform in which Pt atoms can be homogeneously dispersed, and also serves as a precursor for subsequent leaching. Compared with conventional preparation methods, including impregnation and coprecipitation, this one-step process eliminates the need for thermal treatments such as high temperature calcination and/or reduction, thus minimizing the sintering or crystal grain growth problems caused by these treatments. Consequently, the materials derived from Al76Fe23.5Pt0.5 exhibit high catalytic performance during CO oxidation and the CO-PROX reaction due to the monodispersed Pt nanocrystals in the porous or nanoparticle Fe3O4 matrix.

Graphical Abstract

A high performance nanocomposite Pt-Fe3O4 catalyst, consisting of monodispersed Pt nanocrystals in a porous Fe3O4 matrix, was prepared by a one-step process based on caustic leaching of a bulk Al13(Fe + Pt)4 intermetallic compound.

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Acknowledgments

The authors are grateful to Dr. Masahiko Shimoda (NIMS) for helpful discussions and to Dr. Masahiko Tanaka and Dr. Yoshiyuki Yamashita (NIMS) for assistance during the powder XRD and HEXPS measurements at SPring-8 (beam line 15XU: proposal Nos. 2014A4900, 2014B4901, 2015A4900, 2015A4901 and 2015B4900). This work was supported in part by a Grant-in-Aid for Scientific Research ((A) 15H02299) and “Nanotechnology Platform” (Project No. 12024046) from the Ministry of Education, Culture, Sports, Science and Technology (MEXT) of Japan.

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Authors and Affiliations

  1. Institute of Multidisciplinary Research for Advanced Materials (IMRAM), Tohoku University, 2-1-1 Katahira, Aoba-ku, Sendai, 980-8577, Japan

    Satoshi Kameoka, Satoru Wakabayashi & An Pang Tsai

  2. Department of Materials Science and Engineering, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo, 113-8656, Japan

    Eiji Abe

  3. National Institute for Materials Science (NIMS), 1-2-1 Sengen, Tsukuba, 305-0047, Japan

    An Pang Tsai

Authors
  1. Satoshi Kameoka
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  2. Satoru Wakabayashi
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  3. Eiji Abe
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  4. An Pang Tsai
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Correspondence to Satoshi Kameoka.

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Kameoka, S., Wakabayashi, S., Abe, E. et al. One-Step Synthesis of a High Performance Pt-Fe3O4 Catalyst: Intermetallic Al13Fe4 as a Platform and Precursor. Catal Lett 146, 1309–1316 (2016). https://doi.org/10.1007/s10562-016-1757-y

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  • DOI: https://doi.org/10.1007/s10562-016-1757-y

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