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Keywords:

  • adsorption;
  • heterogeneous catalysis;
  • nanoparticles;
  • reaction intermediates;
  • selectivity
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In situ molecular-level studies of catalytic reactions with scanning tunneling microscopy (STM) and sum frequency generation (SFG) vibrational spectroscopy have revealed seven molecular components of selectivity—surface structure, adsorbate-induced restructuring, adsorbate mobility, reaction intermediates, surface composition, charge transport, and oxidation states—for heterogeneous catalysis on metal single-crystal model surfaces and nanoparticles. For details, see the Review by G. A. Somorjai and J. Y. Park on page 9212 ff.