The main components of chemical fiber catalyst are metal elements, such as copper, iron, cobalt, molybdenum and nickel, among which iron is the most common. Iron is a metal element and plays an important role in the catalyst. It can decompose raw materials into useful products at a very fast speed without changing the composition of the final product. The role of iron in the catalyst is to greatly improve the activity of the reaction, thus greatly improving the efficiency of the reaction. In practical application, high yield can be obtained in a short time.