What is “iron-redox” technology?
Iron has long been known to be an effective catalyst for the oxidation of H2S to elemental sulfur. Iron sponge systems have been in service for over 100 years. The “trick” to getting the cost down to treat larger volumes of gas was to make the iron catalyst regenerable, and to put it in solution. ARI Technologies, now Gas Technology Products, succeeded in developing a stable system of chelates in the early 1970’s that were both stable relative to iron solubility, and oxidation, as oxygen is used to regenerate the iron catalyst. The result was the development of the LO-CAT Hydrogen Sulfide Removal System.
