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CeO_2 precursors were prepared by the homogeneous precipitation method, hydrothermal synthesis method and hydrothermal precipitation coupling method using urea as a precipitator.The results indicated that urea was a reserve resource of CO~ 2- __3.CeO_2 precursors were orthorhombic Ce_2O(CO_3) _2·H_2O, hexagonal Ce(OH)(CO_3) , orthorhombic CeO(CO_3)_2·H_2O respectively when the homogeneous precipitation method, hydrothermal synthesis method and hydrothermal precipitation coupling method were used.The synthesis technology had a great effect on the precursors.Different precursors were synthesized through various processes and mechanisms.When heated up to the temperature of 500℃, the precursors were all finally changed into face centred cubic CeO_ 2 powders.
CeO_2 precursors were prepared by the homogeneous precipitation method, hydrothermal synthesis method and hydrothermal precipitation coupling method using urea as a precipitator. The results indicated that urea was a reserve resource of CO ~ 2- __3.CeO_2 precursors were orthorhombic Ce_2O (CO_3) _2 · H_2O, hexagonal Ce (OH) (CO_3), orthorhombic CeO (CO_3) _2 · H_2O respectively when the homogeneous precipitation method, hydrothermal synthesis method and hydrothermal precipitation coupling method were used. The synthesis technology had a great effect on the precursors. were synthesized through various processes and mechanisms. When heated up to the temperature of 500 ° C, the precursors were all finally changed into face centred cubic CeO_2 powders.