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Nature of Rh Oxide on Rh Nanoparticles and Its Effect on the Catalytic Activity of CO Oxidation

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Abstract

Surface oxide layers formed on transition metal catalysts are well known as one of the controlling factors in enhancing or suppressing the catalytic activity of metal catalysts. We investigated the growth of a surface oxide layer on two sizes of Rh metal nanoparticles (NPs) as a function of UV–ozone (UV/O3) dosing as well as how the oxide layer formed on the surface of the Rh NPs affects the catalytic activity for CO oxidation. Monodisperse Rh NPs were synthesized via one-pot polyol reduction using poly(vinylpyrrolidone) as a capping agent. Varying the concentration of the Rh precursors controlled the size of the NPs. The changes that occurred as a function of UV/O3 dosing were characterized using X-ray photoelectron spectroscopy, which showed that the oxidation state increased with increasing surface modification time. The catalytic activity and activation energy of the two-dimensional Rh NPs arrays were measured as the UV/O3 exposure time increased. Our reaction studies indicate that the turnover rate of CO oxidation on the Rh NPs is enhanced as the quantity of the surface oxide layer formed during UV/O3 surface treatment increases, indicating that the oxides grown on the surface of the Rh metal are catalytically active. These results suggest an intriguing way to tune catalytic activity via engineering of the nanoscale surface oxide.

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Acknowledgments

This work was supported by the WCU (World Class University) program (31-2008-000-10055-0 and 2012R1A2A1A01009249) through the National Research Foundation, the Research Center Program (CA1201) of IBS (Institute for Basic Science), and from the Fundamental R&D Program for Core Technology of Materials funded by the Ministry of Knowledge Economy, Republic of Korea. S.H.J. was supported by the Basic Science Research Program through the National Research Foundation of Korea funded by the Ministry of Education, Science and Technology (2010-0005341) and by the TJ Park Junior Faculty Fellowship.

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Authors and Affiliations

  1. Graduate School of EEWS (WCU) and NanoCentury KI, KAIST (Korea Advanced Institute of Science and Technology), Daejeon, 305-701, Republic of Korea

    Sun Mi Kim, Kamran Qadir, Osamu Terasaki & Jeong Young Park

  2. Center for Nanomaterials and Chemical Reactions, Institute for Basic Science, Daejeon, 305-701, Republic of Korea

    Sun Mi Kim, Kamran Qadir & Jeong Young Park

  3. School of Nano-Bioscience and Chemical Engineering, Ulsan National Institute of Science and Technology (UNIST), UNIST-gil 50, Ulsan, 689-798, Republic of Korea

    Bora Seo & Sang Hoon Joo

  4. UNIST Central Research Facilities and School of Mechanical & Advanced Materials Engineering, Ulsan National Institute of Science and Technology (UNIST), UNIST-gil 50, Ulsan, 689-798, Republic of Korea

    Hu Young Jeong

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  1. Sun Mi Kim
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  2. Kamran Qadir
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  3. Bora Seo
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  6. Osamu Terasaki
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  7. Jeong Young Park
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Correspondence to Jeong Young Park.

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Kim, S.M., Qadir, K., Seo, B. et al. Nature of Rh Oxide on Rh Nanoparticles and Its Effect on the Catalytic Activity of CO Oxidation. Catal Lett 143, 1153–1161 (2013). https://doi.org/10.1007/s10562-013-1087-2

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  • DOI: https://doi.org/10.1007/s10562-013-1087-2

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