Abstract

The preparation of small metallic iron particles from ion exchanged magnesium hydroxycarbonate and coprecipitated starting materials is reported. The effect of different activation prócedures prior to reduction is studied, and the nature of the starting material is found to play a more important role than the activation procedure. The smallest iron particles were prepared starting from coprecipitated structures. These results are discussed in terms of a model for the structure and genesis of the various catalysts. The structural information is obtained mainly from Mössbauer spectroscopy and X-ray diffraction. The study leads to a possible explanation of the nature of the metal-supported interaction in these catalyst systems.

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