| abstract |
PROBLEM TO BE SOLVED To provide a cerium oxide having a very low content of coarse particles and a production method capable of easily producing the same. SOLUTION A cerium carbonate having a ratio of cerium oxide (CeO 2 / TREO) in a total rare earth oxide equivalent amount of 90% or more is immersed and heated in an aqueous solution, or the cerium carbonate has a relative humidity of 80 Oxidation by performing a wet heat treatment process to obtain cerium monooxycarbonate by humidifying and heating and heating in an atmosphere of at least%, and a drying process to obtain cerium oxide by drying cerium monooxycarbonate at a temperature of 130 ° C. to 250 ° C. Manufacture cerium. Then, cerium oxide having a low content of coarse particles is generated. [Selection figure] None |