Vanadium Hydride as an Ammonia Synthesis Catalyst

Yu Cao, Ayaka Saito, Yoji Kobayashi, Hiroki Ubukata, Ya Tang, Hiroshi Kageyama

Research output: Contribution to journalArticlepeer-review

25 Scopus citations

Abstract

Early 3d transition metals, such as Ti, V, or Nb are known to be inactive for the Haber-Bosch process, due to their strong M−N bonds. However, recently some hydride compounds have been found to effectively counteract this effect, imparting catalytic activity on a wide range of elements. With these hydride catalysts, hydride (and nitride) bulk diffusion mechanisms have been proposed; if so, more open structures should enhance their activity. Here, we expand the study to hydrides of other early transition metals, V and Nb. These metals benefit from body-centered cubic (bcc) related structures which enhance hydride diffusion, in addition to having relatively lower M−N bond strengths. The activity of vanadium hydride, most likely with an active composition of VH0.44N0.16, is superior to the previously reported BaTiO2.5H0.5, and comparable to TiH2 and Cs−Ru/MgO at 400 °C under 5 MPa. These results show that there is more potential for developing new single-phase hydride catalysts of previously overlooked elements without sacrificing activity.
Original languageEnglish (US)
Pages (from-to)191-195
Number of pages5
JournalChemCatChem
Volume13
Issue number1
DOIs
StatePublished - Jan 12 2021
Externally publishedYes

ASJC Scopus subject areas

  • Inorganic Chemistry
  • Physical and Theoretical Chemistry
  • Organic Chemistry
  • Catalysis

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