Influence of Powdered Cellulose and Charge Preparation Procedure on the Phase Composition and Characteristics of the Iron-Potassium Oxide Material

Resumo

The charge for the iron-potassium oxide system containing powdered cellulose was prepared by the sol-gel procedure and coprecipitation of salts. The influence of the charge preparation procedure, introduction of powdered cellulose, and its amount on the phase formation in the system [Fe₂O₃: K₂O: MoO₃: CeO₂: CaO: TiO₂: MgO: SiO₂]: powdered cellulose = (100 − x) [56.71: 20.88: 11.55: 6.38: 3.68: 0.58: 0.11: 0.11]: x, where x = 0–3 wt %, on the phase formation in the system in the temperature interval 25–1200°C was studied by differential calorimetry and by thermal and X-ray diffraction analysis. The influence of the sintering conditions, introduction of powdered cellulose, and its amount on the textural characteristics of the iron-potassium oxide material was examined. The activation energies of the transformation of maghemite to hematite in the samples were calculated. The contribution of the energy released in thermal degradation of powdered cellulose to the total amount of energy was estimated. Samples of the iron-potassium oxide material with the preset phase composition and textural characteristics required for further studies of the catalytic activity were prepared.