Why Molybdenum is Used in the Manufacture of Ammonia

Molybdenum tubing has particularly good resistance to corrosion by mineral acids, provided oxidizing agents are not present. It is also resistant to many liquid metals and to most molten glasses.Molybdenum is relatively inert in hydrogen, ammonia, and nitrogen up to about 1100 C, but a superficial nitride case may be formed in ammonia or nitrogen.