Anchoring Bond between Ru and N Atoms of Ru/Ca2NH Catalyst: Crucial for the High Ammonia Synthesis Activity

Hitoshi Abe, Yasuhiro Niwa, Masaaki Kitano, Yasunori Inoue, Masato Sasase, Takuya Nakao, Tomofumi Tada, Toshiharu Yokoyama, Michikazu Hara, Hideo Hosono

Research output: Contribution to journalArticlepeer-review

18 Citations (Scopus)

Abstract

Key functions for the stability and activity of Ru catalysts for ammonia synthesis were examined by X-ray absorption fine structure (XAFS) experiments. Ru K-edge XAFS measurements were carried out for two Ru catalysts, Ru/Ca2NH and Ru/CaNH, which include N atoms in the supports. The stable Ru-N bond was observed in the Ru/Ca2NH catalyst, but not in the Ru/CaNH catalyst, which was also supported by theoretical calculations in terms of Ru-anion bond strength. The bond observed in the Ru/Ca2NH works to anchor the Ru nanoparticles to the Ca2NH support, and the activity has been maintained. Formation of anchoring bonds between catalyst particles and supports is essential to create highly active and long lasting catalysts.

Original languageEnglish
Pages (from-to)20900-20904
Number of pages5
JournalJournal of Physical Chemistry C
Volume121
Issue number38
DOIs
Publication statusPublished - Sep 28 2017
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Energy(all)
  • Physical and Theoretical Chemistry
  • Surfaces, Coatings and Films

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