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Surface Thermodynamics: Small Molecule Adsorption Calorimetry on Metal Single Crystals

  • Vittorio Fiorin
  • David Borthwick
  • David A. King
Chapter

Abstract

Using single-crystal adsorption calorimetry (SCAC), accurate coverage-dependent heat of adsorption and sticking probability data are presented for adsorption of CO, O2 and NO on flat and stepped nickel, platinum and iron single-crystal surfaces. We show that step atoms are the key to understanding the increased reactivity for dissociation and oxidation compared to the low Miller index surfaces. Pre-exponential factors for first-order desorption, ν, are directly evaluated and show considerably more variation than previously assumed: depending on the gas-surface system, we find values for ν that range from 1011 to 1022 s−1. In this respect, evaluations of the activation energy for first-order desorption using temperature-programmed desorption analyses may be severely flawed if a fixed value of ν, usually 1013 s−1, is chosen.

Keywords

Step Atom Molecular Adsorption Initial Heat Sticking Probability Integral Heat 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

Notes

Acknowledgements

We acknowledge the EPSRC for an equipment grant, postdoctoral support (V.F.) and a research studentship (D.B.). Jacques Chevallier of Aarhus University, Denmark, is thanked for providing the thin film single crystals.

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Copyright information

© Springer Science+Business Media, LLC 2010

Authors and Affiliations

  • Vittorio Fiorin
    • 1
  • David Borthwick
    • 1
  • David A. King
    • 1
  1. 1.Department of ChemistryUniversity of CambridgeCambridgeUK

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