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Atomic-Resolution HAADF-STEM Study of Ag/Al2O3 Catalysts for Borrowing-Hydrogen and Acceptorless Dehydrogenative Coupling Reactions of Alcohols

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Abstract

We study HAADF-STEM analysis of Ag/Al2O3 samples (as-calcined and reduced at 25, 300, 500 and 900 °C). Ag atoms are classified into subnanoclusters (0.3–1 nm), nanoclusters (1–3 nm), nanoparticles (3–10 nm) and polycrystals (>10 nm). The size of Ag increases with the reduction temperature, which is supported by EXAFS analysis. The effect of Ag size on the activity for borrowing-hydrogen and acceptorless dehydrogenative couplings of alcohols is discussed.

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Acknowledgments

This work was supported by Grant-in-Aids for Scientific Research B (26289299) from MEXT (Japan), a MEXT program “Elements Strategy Initiative to Form Core Research Center” and a Grant-in-Aid for Scientific Research on Innovative Areas “Nano Informatics” (25106010) from JSPS.

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Authors and Affiliations

  1. International Research Center for Nuclear Materials Science, Institute for Materials Research, Tohoku University, Oarai, Ibaraki, 311-1313, Japan

    Kenta Yoshida

  2. Institute for Catalysis, Hokkaido University, N-21, W-10, Sapporo, 001-0021, Japan

    Kenichi Kon & Ken-ichi Shimizu

  3. Elements Strategy Initiative for Catalysts and Batteries, Kyoto University, Katsura, Kyoto, 615-8520, Japan

    Ken-ichi Shimizu

Authors
  1. Kenta Yoshida
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  2. Kenichi Kon
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Correspondence to Ken-ichi Shimizu.

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Yoshida, K., Kon, K. & Shimizu, Ki. Atomic-Resolution HAADF-STEM Study of Ag/Al2O3 Catalysts for Borrowing-Hydrogen and Acceptorless Dehydrogenative Coupling Reactions of Alcohols. Top Catal 59, 1740–1747 (2016). https://doi.org/10.1007/s11244-016-0695-7

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  • DOI: https://doi.org/10.1007/s11244-016-0695-7

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