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Thermal Evolution of the Structure and Activity of Rh Overlayer Catalysts Prepared by Pulsed Arc-Plasma Deposition

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Abstract

Nanometric Rh overlayers were formed on Fe–Cr–Al stainless steel (SUS) foils by pulsed cathodic arc-plasma (AP) technique to investigate the thermal evolution of the structure and catalytic activity for stoichiometric NO–CO–C3H6–O2 reaction. As-prepared Rh overlayer catalysts (Rh/SUS) with 2000–8000 AP pulsing showed steep light-off of NO, CO and C3H6 at around 250 °C and their conversions soon reached to almost 100%. After thermal aging at 900 °C in H2O/air, however, the catalytic activity was decreased to the different extent depending on the number of AP pulsing. The most significant deactivation was observed for the smallest numbers of AP pulsing (2000), because Al in the foil was oxidized during the aging to form a passivation layer of α-Al2O3, which covered the surface of the foil and decreased the surface concentration of Rh. To overcome this deactivation, the Rh overlayer was formed by AP after preheating the foil at 1000 °C in air. This modified preparation process enables the deposition of Rh overlayer on the highly crystalline α-Al2O3 layer at the surface of the foil, which is found to be much more stable against thermal deactivation.

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Acknowledgements

This work was supported by the MEXT (Ministry of Education Culture, Sports, Science and Technology) program ‘Elements Strategy Initiative to Form Core Research Center’ (since 2012) and the JST (Japan Science and Technology Agency) program ‘A-STEP AS262Z00723M’, Japan.

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Authors and Affiliations

  1. Department of Applied Chemistry and Biochemistry, Graduate School of Science and Technology, Kumamoto University, 2-39-1 Kurokami, Chuo, Kumamoto, 860-8555, Japan

    Satoshi Misumi, Hiroshi Yoshida, Akinori Matsumoto, Satoshi Hinokuma & Masato Machida

  2. Unit of Elements Strategy Initiative for Catalysts and Batteries, Kyoto University, 1-30 Goryo-Ohara, Nishikyo, Kyoto, 615-8245, Japan

    Hiroshi Yoshida, Satoshi Hinokuma & Masato Machida

  3. Japan Science and Technology Agency, Precursory Research for Embryonic Science and Technology, 4-1-8 Honcho, Kawaguchi, Saitama, 332-0012, Japan

    Satoshi Hinokuma

  4. Technical Division, Faculty of Engineering, Kumamoto University, 2-39-1 Kurokami, Chuo, Kumamoto, 860-8555, Japan

    Tetsuya Sato

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  1. Satoshi Misumi
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  2. Hiroshi Yoshida
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  3. Akinori Matsumoto
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  4. Satoshi Hinokuma
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Correspondence to Masato Machida.

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Misumi, S., Yoshida, H., Matsumoto, A. et al. Thermal Evolution of the Structure and Activity of Rh Overlayer Catalysts Prepared by Pulsed Arc-Plasma Deposition. Top Catal 60, 955–961 (2017). https://doi.org/10.1007/s11244-017-0760-x

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