Ammonia synthesis at low temperatures

Thomas Holm Rod, Ashildur Logadottir, Jens Kehlet Nørskov

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Abstract

Density functional theory (DFT) calculations of reaction paths and energies for the industrial and the biological catalytic ammonia synthesis processes are compared. The industrial catalyst is modeled by a ruthenium surface, while the active part of the enzyme is modeled by a MoFe6S9 complex. In contrast to the biological process, the industrial process requires high temperatures and pressures to proceed, and an explanation of this important difference is discussed. The possibility of a metal surface catalyzed process running at low temperatures and pressures is addressed, and DFT calculations have been carried out to evaluate its feasibility. The calculations suggest that it might be possible to catalytically produce ammonia from molecular nitrogen at low temperatures and pressures, in particular if energy is fed into the process electrochemically. (C) 2000 American Institute of Physics.
Original languageEnglish
JournalJournal of Chemical Physics
Volume112
Issue number12
Pages (from-to)5343-5347
ISSN0021-9606
DOIs
Publication statusPublished - 2000

Bibliographical note

Copyright (2000) American Institute of Physics. This article may be downloaded for personal use only. Any other use requires prior permission of the author and the American Institute of Physics.

Keywords

  • CHEMISORPTION
  • BINDING
  • SURFACE
  • FEMO-COFACTOR
  • IRON-MOLYBDENUM COFACTOR
  • AZOTOBACTER-VINELANDII NITROGENASE
  • HYDROGEN
  • PRESSURE
  • PSEUDOPOTENTIALS
  • FIXATION

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