Preparation of different CeO_2 precursors with precipitator urea
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.