High Electron Density on Ru in Intermetallic YRu2: The Application to Catalyst for Ammonia Synthesis

Takaya Ogawa, Yasukazu Kobayashi, Hiroshi Mizoguchi, Masaaki Kitano, Hitoshi Abe, Tomofumi Tada, Yoshitake Toda, Yasuhiro Niwa, Hideo Hosono

Research output: Contribution to journalArticle

6 Citations (Scopus)

Abstract

Ruthenium is the most effective catalyst reported to date for ammonia synthesis under mild conditions, especially when an electron promoter is used. However, electron donation from the promoter has not been sufficient because the promoter contacts with Ru only through its surface. Here, we report a Laves phase intermetallic bulk catalyst, YRu2, which has higher electron density on Ru. This is derived from large electron transfer from Y to Ru, which is first confirmed by X-ray absorption fine structure measurements and theoretical calculations. In addition, YRu2 has high hydrogen solubilities leading to suppression of hydrogen poisoning, a common drawback of Ru-based catalysts. Consequently, YRu2 exhibits higher catalytic activity for ammonia synthesis over 300 times that with pure ruthenium. The present results suggest a simple concept for ammonia synthesis: Laves phase intermetallic compounds of Ru and more electropositive metals are more efficient catalysts than pure Ru because of the large electron promotion and suppression of hydrogen poisoning.

Original languageEnglish
Pages (from-to)10468-10475
Number of pages8
JournalJournal of Physical Chemistry C
Volume122
Issue number19
DOIs
Publication statusPublished - May 17 2018

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Ammonia
Intermetallics
Carrier concentration
intermetallics
ammonia
catalysts
Hydrogen
Catalysts
Laves phases
Ruthenium
Electrons
poisoning
synthesis
ruthenium
hydrogen
retarding
Catalyst poisoning
electrons
X ray absorption
promotion

All Science Journal Classification (ASJC) codes

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

Cite this

High Electron Density on Ru in Intermetallic YRu2 : The Application to Catalyst for Ammonia Synthesis. / Ogawa, Takaya; Kobayashi, Yasukazu; Mizoguchi, Hiroshi; Kitano, Masaaki; Abe, Hitoshi; Tada, Tomofumi; Toda, Yoshitake; Niwa, Yasuhiro; Hosono, Hideo.

In: Journal of Physical Chemistry C, Vol. 122, No. 19, 17.05.2018, p. 10468-10475.

Research output: Contribution to journalArticle

Ogawa, T, Kobayashi, Y, Mizoguchi, H, Kitano, M, Abe, H, Tada, T, Toda, Y, Niwa, Y & Hosono, H 2018, 'High Electron Density on Ru in Intermetallic YRu2: The Application to Catalyst for Ammonia Synthesis', Journal of Physical Chemistry C, vol. 122, no. 19, pp. 10468-10475. https://doi.org/10.1021/acs.jpcc.8b02128
Ogawa, Takaya ; Kobayashi, Yasukazu ; Mizoguchi, Hiroshi ; Kitano, Masaaki ; Abe, Hitoshi ; Tada, Tomofumi ; Toda, Yoshitake ; Niwa, Yasuhiro ; Hosono, Hideo. / High Electron Density on Ru in Intermetallic YRu2 : The Application to Catalyst for Ammonia Synthesis. In: Journal of Physical Chemistry C. 2018 ; Vol. 122, No. 19. pp. 10468-10475.
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AU - Kitano, Masaaki

AU - Abe, Hitoshi

AU - Tada, Tomofumi

AU - Toda, Yoshitake

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