Abstract
Effects of particle size on the catalytic properties of very small metal particles embedded on a flat support have been reviewed. Among various methods for the preparation of small metal particles, a model catalyst method has been chosen because the metal particles can be well characterized. The model catalyst is prepared by vacuum evaporation of metals onto a flat support and studied by such techniques as flash desorption spectrometry, photoelectron and Auger electron spectroscopy, and so on. Adsorption-desorption behaviors of CO, oxidation of CO, hydrogenation of C2H4 or H2-D2 exchange reaction have been examined on small particles of Ni, Pd, Pt, or Ru (ranging from 0.8-12 nmφ in diameter) which were prepared on a mica sheet, and Al2O3, or carbon supports. An electrochemical method to investigate the size effect in the desorption of hydrogen and oxidation of CH3OH has also been introduced.
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