The iron compounds resulting from the impregnation of the most common supports—alumina and silica gel-with an aqueous FeSO 4 · 7H 2 O solution and subsequent heat treatment in air are identified by thermal analysis and Mössbauer spectroscopy. The state of the active component of the iron-containing catalysts depends strongly on the nature of the support.
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Литвак et al. (2009) studied this question.