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Observation of Adsorbed Hydrogen Species on Supported Metal Catalysts by Inelastic Neutron Scattering

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Abstract

Adsorbed hydrogen (H) species on catalyst surfaces are important active intermediates in many catalytic reactions and detailed analyses of them are necessary to understand the catalyses. Inelastic neutron scattering (INS) enables direct and selective observation of H species due to the extremely large incoherent neutron scattering cross section of a hydrogen atom. In the present study, the adsorbed H species on some heterogeneous precious metal catalysts supported by alumina and carbon black were investigated by in situ INS spectroscopy with a newly designed sample cell. The newly designed double-walled long cell gave clear INS spectra with less elastic scattering. Three alumina-supported metal catalysts having Pt, Pd, and Rh metal nanoparticles with different particle sizes exhibited different INS spectra in intensities and band distribution. Observation of the H species on the metal nanoparticles and the alumina surface revealed their properties. In addition, the H atoms stored in Pd nanoparticles were observed as palladium hydride. In contrast, the H species on a Pt catalyst supported by carbon black were found to be strongly adsorbed on the carbon support. The properties of these H species were dependent on both the properties of the precious metals and those of the support materials.

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Acknowledgements

The authors thank Dr. Hiroyuki Asakura in Kyoto University for his kind help for the CO adsorption experiments. The authors also thank Dr. Toshiyuki Tanaka in Toyota Central R&D Labs., Inc. for his kind donation of the catalyst samples and Technical Division of Institute for Catalysis, Hokkaido University for development of the measurement cell at the initial stage of the present study. The XAFS measurements were performed at the BL01B1 of SPring-8 with the approval of the Japan Synchrotron Radiation Research Institute (JASRI) (Proposal Numbers: 2020A1081 and 2020A1219). The INS experiments were performed with the approval of Japan Proton Accelerator Research Complex (J-PARC) (Proposal Nos. 2019A0091, 2017E0003, 2017B0229, 2015E0004, 2015A0074, and 2013B0093). This work was supported by the Elements Strategy Initiative for Catalysts and Batteries (ESICB) of MEXT (Grant Number: JPMXP0112101003).

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Authors and Affiliations

  1. Elements Strategy Initiative for Catalysts & Batteries (ESICB), Kyoto University, 1-30 Goryo-Ohara, Nishikyo-ku, Kyoto, 615-8245, Japan

    Hisao Yoshida, Akira Yamamoto, Saburo Hosokawa, Seiji Yamazoe, Soichi Kikkawa & Tsunehiro Tanaka

  2. Department of Interdisciplinary Environment, Graduate School of Human and Environmental Studies, Kyoto University, Yoshida-nihonmatsu-cho, Sakyo-ku, Kyoto, 606-8501, Japan

    Hisao Yoshida & Akira Yamamoto

  3. Department of Molecular Engineering, Graduate School of Engineering, Kyoto University, Kyotodaigaku Katsura, Nishikyo-ku, Kyoto, 615-8510, Japan

    Saburo Hosokawa & Tsunehiro Tanaka

  4. Department of Chemistry, Graduate School of Science, Tokyo Metropolitan University, 1-1, Minami-osawa, Hachioji, Tokyo, 192-0397, Japan

    Seiji Yamazoe & Soichi Kikkawa

  5. Department of Applied Chemistry, School of Engineering, Tokyo University of Technology, 1404-1 Katakura, Hachioji, Tokyo, 192-0982, Japan

    Kenji Hara

  6. Materials and Life Science Division, J-PARC Center, Japan Atomic Energy Agency, Tokai, Ibaraki, 319-1195, Japan

    Mitsutaka Nakamura

  7. CROSS Neutron Science and Technology Center, Tokai, Ibaraki, 319-1106, Japan

    Kazuya Kamazawa

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  1. Hisao Yoshida
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  2. Akira Yamamoto
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  3. Saburo Hosokawa
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Correspondence to Hisao Yoshida.

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Yoshida, H., Yamamoto, A., Hosokawa, S. et al. Observation of Adsorbed Hydrogen Species on Supported Metal Catalysts by Inelastic Neutron Scattering. Top Catal 64, 660–671 (2021). https://doi.org/10.1007/s11244-021-01448-7

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  • DOI: https://doi.org/10.1007/s11244-021-01448-7

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