Abstract
Small particles of Rh were grown in high vacuum on NaCl cleavage planes at 575–650 K and backed with a supporting film of Al 2O 3. A detailed analysis of the morphology, microstructure and orientation of the particles by high resolution electron microscopy, selected area electron diffraction and weak-beam dark-field imaging revealed the presence of a variety of regularly shaped Rh particles with different habits and substrate-overgrowth relations, i.e. half octahedra, pseudo-pentagonal pyramids, truncated tetrahedra and multiply-twinned particles (decahedra, icosahedra). These films are used as model catalysts since they are especially suited to follow morphology changes which may occur during activation, during regeneration or during the reaction. Depending on the pretreatment conditions Rh particles with mainly low or high index faces were obtained.
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