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  • 1 Università degli Studi di Milano Dipartimento di Chimica Fisica ed Elettrochimica via C. Golgi n. 19 20133 Milano Italy
  • 2 Università degli Studi di Milano Centro di Eccellenza CIMAINA via C. Golgi n. 19 20133 Milano Italy
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Abstract  

A series of catalysts prepared by dispersing iron oxide on supports of different nature and acidity has been studied. Silica (S) and silica-zirconia mixed oxides (SZ) with different ZrO2 content (from 5 to 45 mass%) were used as supports for the iron oxide phase which was deposited over them by an equilibrium-adsorption method. The red-ox properties of the Fe-catalysts were studied by temperature programmed reduction (TPR) technique. The two well defined and narrow TPR peaks observed could be associated with the reduction steps: I) Fe2O3→FeO and Fe2O3→Fe(0) (at ca. 400°C) and II) FeO→Fe(0) (at ca. 800–900°C). The temperature of the second-step-peak increased with the zirconia content in the support, likely because of the stronger interaction of the iron oxide phase with the support. Activation parameters for the two step-reduction processes were obtained by a simple computation procedure applied to the TPR profiles.

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