Ammonia synthesis was discovered by Fritz Haber, by using iron catalysts.

In industrial practice, the iron catalyst is prepared by exposing a mass of magnetite, an iron oxide, to the hot hydrogen feedstock.

Another significant application of Mössbauer spectroscopy is the study of phase transformations that occur in iron catalysts during Fischer-Tropsch synthesis.

At 1000 C in the presence of an iron catalyst, "small" amounts of ammonia were produced from dinitrogen and dihydrogen gas.

Without an iron catalyst, the reaction is complete after several hours ( 7), when no further weight increase due to nitrogen absorption (per gram of silicon) is detected.

In addition, this same iron catalyst can be used to build polymers with a Si-R-Si backbone.

Rentech's process involves using a molten wax slurry reactor with an iron catalyst.

Fenton's reagent is a solution of hydrogen peroxide and an iron catalyst that is used to oxidize contaminants or waste waters.

Group 1 alkali metals, including potassium, are a poison for cobalt catalysts but are promoters for iron catalysts.

Many times, iron catalysts change very much and form many chemical phases, like various oxides and carbides, during the reaction.