Physicochemical characterization of ceria as a final decomposition product of ammonium cerium (III) oxalate hydrate

Add time:09/07/2019    Source:sciencedirect.com

High surface area and porous ceria was produced as a final decomposition product of ammonium cerium(III) oxalate hexahydrate. Thermal processes involved in the decomposition of (NH4)2Ce2(C2O4)4·6H2O on heating up to 500°C in air were monitored by differential thermal analysis (DTA) and thermogravimetric analysis (TG) at various heating rates. Intermediates and final solid products were characterized by X-ray diffraction (XRD) and IR spectroscopy. The results indicated that the decomposition takes place via five weight loss processes; three endothermic with peaks at 110, 170 and 290°C and two exothermic at 320 and 335°C. The formation of anhydrous ammonium salt occurs at 170°C, and this decomposes at 290°C giving rise to the unstable intermediate hydrogen ceric oxalate, the latter decomposing immediately to Ce2(CO3)3 and Ce2(CO3)2 at 320°C. The unstable carbonates undergo an oxidative decomposition to give the final product, CeO2, at 335°C. Surface texture analysis and scanning electron microscopy showed that CeO2, when produced at 300 and 400°C, had a surface area of 130 m2 g−1 and 120 m2 g−1, respectively and was a crystalline porous material.

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