Cerium oxide is a yellowish or yellowish brown inorganic powder that has many important uses. It is often used as a catalyst in the chemical industry, especially in the preparation of organic chemicals and the purification of waste gas wastewater. In addition, cerium oxide is also an efficient polishing material, widely used in glass, ceramics, gems and other materials polishing, can significantly improve the finish of the workpiece. In the electronics field, cerium oxide also plays an important role in the manufacture of electronic ceramics and fuel cell electrolytes.