Abstract
The method of ionic membrane electrolysis was applied to prepare cerium (IV) oxide from cerium (III) chloride aqueous solution. This research focused on the effect of different current densities on electrolytic product. The results indicated that the method of ion-exchange membrane electrolysis was feasible to produce pure CeO2 particles with the chlorine content of lower than 0.020%. Under the conditions of this study, when the current density changed from 100 mA·cm−2 to 400 mA·cm−2, the current efficiency of CeO2 decreased monotonically from about 89.0% to 75.0%, the median particle sizes (D50) of CeO2 samples were about 9 μm~24 μm. After 1.5 h of roasting at 800 °C, the crystals of CeO2 continued to grow, and the roasted product was still CeO2, whose particle size of D50 increased from about 17 μm (before roasting) to 27 μm (after roasting). Additionally, it was obvious that the crystal after roasting was composed of nano-sized spherical particles.
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