Direct NO decomposition over stepped transition-metal surfaces

Hanne Falsig, Thomas Bligaard, Claus H. Christensen, Jens Kehlet Nørskov

Research output: Contribution to journalJournal articleResearchpeer-review

Abstract

We establish the full potential energy diagram for the direct NO decomposition reaction over stepped transition-metal surfaces by combining a database of adsorption energies on stepped metal surfaces with known Bronsted-Evans-Polanyi (BEP) relations for the activation barriers of dissociation of diatomic molecules over stepped transition- and noble-metal surfaces. The potential energy diagram directly points to why Pd and Pt are the best direct NO decomposition catalysts among the 3d, 4d, and 5d metals. We analyze the NO decomposition reaction in terms of a Sabatier-Gibbs-type analysis, and we demonstrate that this type of analysis yields results that to within a surprisingly small margin of error are directly proportional to the measured direct NO decomposition over Ru, Rh, Pt, Pd, Ag, and An. We suggest that Pd, which is a better catalyst than Pt under the employed reaction conditions, is a better catalyst only because it binds O slightly weaker compared to N than the other metals in the study.
Original languageEnglish
JournalPure and Applied Chemistry
Volume79
Issue number11
Pages (from-to)1895-1903
ISSN0033-4545
DOIs
Publication statusPublished - 2007

Keywords

  • decomposition catalyst
  • dissociation
  • EVANS-POLANYI RELATION;
  • Bronsted-Evans-Polanyi
  • NO decomposition
  • activation barriers
  • NO

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