Application of metal catalysts

When selecting and designing metal catalysts, it is often considered that there should be appropriate energy adaptability and space adaptability between the metal component and the reactant molecules to facilitate the activation of the reactant molecules. Then consider choosing the appropriate co-catalyst and catalyst carrier as well as the required preparation process, and strictly control the preparation conditions to meet the required chemical composition and physical structure, including the size and distribution of metal crystal grains. Except for precious metals, the reduced metal catalysts are extremely active and easy to be oxidized. For the convenience of storage and transportation, catalyst manufacturers often provide products in the oxide state (see table), and the user can only be reduced to a metal state after activation treatment or during use. The method and conditions of activation are very important (see the use of catalyst). Some catalyst production plants also provide some pre-reduced iron catalysts for ammonia synthesis to shorten the user's start-up period and ensure the use characteristics of the catalyst.