Abstract
Reduction of KM I iron catalyst at 500°C by dry and moist H 2-N 2 (3:1) atmosphere was followed using scanning electron microscope. Dry atmosphere reduction follows a ‘core and shell’ pattern, whereas use of the moist atmosphere leads to reduction of an internal type, qualitatively explained by the crackling model of Park and Levenspiel. The decrease of specific reduction rate caused by a small amount of water is emphasized.
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