Insight into the adsorption competition and the relationship between dissociation and association reactions in ammonia synthesis

T. Song, Peijun Hu

Research output: Contribution to journalArticle

13 Citations (Scopus)

Abstract

Ammonia synthesis on three metal surfaces (Zr, Ru, and Pd) is investigated using density functional theory calculations. In addition to N-2 dissociation, all the transition states of the hydrogenation reactions from N to NH3 are located and the reaction energy profiles at both low and high surface coverages are compared and analyzed. The following are found: (i) Surface coverage effect on dissociation reactions is more significant than that on association reactions. (ii) The difference between N and H chemisorption energies, the so-called chemisorption energy gap which is a measure of adsorption competition, is vital to the reactivity of the catalysts. (iii) The hydrogenation barriers can considerably affect the overall rate of ammonia synthesis. A simple model to describe the relationship between dissociation and association reactions is proposed. (c) 2007 American Institute of Physics.
Original languageEnglish
Article number234706
JournalJournal of Chemical Physics
Volume127 (23)
Issue number23
DOIs
Publication statusPublished - Dec 2007

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics

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