Self-organized Ruthenium–Barium Core–Shell Nanoparticles on a Mesoporous Calcium Amide Matrix for Efficient Low-Temperature Ammonia Synthesis

Masaaki Kitano, Yasunori Inoue, Masato Sasase, Kazuhisa Kishida, Yasukazu Kobayashi, Kohei Nishiyama, Tomofumi Tada, Shigeki Kawamura, Toshiharu Yokoyama, Michikazu Hara, Hideo Hosono

Research output: Contribution to journalArticle

40 Citations (Scopus)

Abstract

A low-temperature ammonia synthesis process is required for on-site synthesis. Barium-doped calcium amide (Ba-Ca(NH2)2) enhances the efficacy of ammonia synthesis mediated by Ru and Co by 2 orders of magnitude more than that of a conventional Ru catalyst at temperatures below 300 °C. Furthermore, the presented catalysts are superior to the wüstite-based Fe catalyst, which is known as a highly active industrial catalyst at low temperatures and pressures. Nanosized Ru–Ba core–shell structures are self-organized on the Ba-Ca(NH2)2 support during H2 pretreatment, and the support material is simultaneously converted into a mesoporous structure with a high surface area (>100 m2 g−1). These self-organized nanostructures account for the high catalytic performance in low-temperature ammonia synthesis.

Original languageEnglish
Pages (from-to)2648-2652
Number of pages5
JournalAngewandte Chemie - International Edition
Volume57
Issue number10
DOIs
Publication statusPublished - Mar 1 2018
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Catalysis
  • Chemistry(all)

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    Kitano, M., Inoue, Y., Sasase, M., Kishida, K., Kobayashi, Y., Nishiyama, K., Tada, T., Kawamura, S., Yokoyama, T., Hara, M., & Hosono, H. (2018). Self-organized Ruthenium–Barium Core–Shell Nanoparticles on a Mesoporous Calcium Amide Matrix for Efficient Low-Temperature Ammonia Synthesis. Angewandte Chemie - International Edition, 57(10), 2648-2652. https://doi.org/10.1002/anie.201712398