Cerium-zirconium solid solution with ultrafine grain size and preparation method thereof

The invention belongs to the field of catalysts, and discloses a preparation method of a cerium-zirconium solid solution with ultra-fine grain size, which is characterized by comprising the following steps: step 1, mixing basic zirconium sulfate, soluble rare earth metal salt and soluble cerium salt to prepare a salt solution; step 2, mixing hydrogen peroxide and a salt solution to obtain a precipitate; 3, washing and roasting the precipitate to obtain a cerium-zirconium solid solution; the molar weight of the hydrogen peroxide is equivalent to 0.1-2 times of the molar weight of Ce < 3 + >. According to the method, the adding time of hydrogen peroxide is advanced, cerium-zirconium coprecipitation is achieved under the extremely alkaline condition, and the cerium-zirconium solid solution with the ultra-fine grain size, high activity and high solid solubility is formed. 本发明属于催化剂领域，公开了一种具有超细晶粒尺寸的铈锆固溶体的制备方法，其特征在于，包括如下步骤：步骤1：将碱式硫酸锆、可溶性稀土金属盐、可溶性铈盐混合制备得到盐溶液；步骤2：将双氧水、盐溶液混合，得到沉淀；步骤3：将沉淀洗涤焙烧得到铈锆固溶体；所述双氧水的摩尔量相当于Ce3+的摩尔量