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Formation of Ir–MgO Solid Solutions Analyzed with X-ray Absorption Spectroscopy

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Abstract

Thermal treatment of MgO-loaded Ir nanoparticles or Ir(OAc)3 formed Ir–MgO solid solutions. The valence of Ir in the Ir–MgO solid solution was 3 +, as evidenced by Ir L3-edge XANES combined with XPS analysis. A slight contraction of the Ir–O bond distance was observed compared to that of the nearest neighboring Mg–O bond in MgO. Ir–MgO dispersion exhibited a two-spike pattern depending on the treatment temperature owing to the formation and successive segregation of the solid solutions.

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Acknowledgements

This research was supported by the Ministry of Education, Science, Sports and Culture, Grant-in-Aid for Scientific Research (C), 22K04833, 2022-2024.

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Authors and Affiliations

  1. Department of Applied Chemistry, School of Advanced Engineering, Kogakuin University, 2665-1 Nakano-Machi Hachioji-City, Tokyo, 192-0015, Japan

    Kazu Okumura, Hitomi Hoshi & Hikaru Iiyoshi

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  1. Kazu Okumura
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  2. Hitomi Hoshi
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  3. Hikaru Iiyoshi
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Contributions

K. Okumura wrote the main manuscript text, prepared figures and the table, and collected XAFS data. H. Hoshi prepared the samples, and obtained data of XRD, N2 adsorption isotherms, TG-DTA, H2-TPR, and dispersion. H. Iiyoshi obtained TEM images.

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Correspondence to Kazu Okumura.

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Okumura, K., Hoshi, H. & Iiyoshi, H. Formation of Ir–MgO Solid Solutions Analyzed with X-ray Absorption Spectroscopy. Catal Surv Asia 27, 95–106 (2023). https://doi.org/10.1007/s10563-022-09378-4

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  • DOI: https://doi.org/10.1007/s10563-022-09378-4

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