12. The Mechanism of Pyrrhotite Formation from Ferric Oxyhydroxide Catalyst

Abstract

The mechanism of pyrrhotite formation has been investigated by using XRD and TEM analysis after sulfiding of iron based catalysts in process solvent at several conditions. Fine crystallites of pyrrhotite were formed from ferric oxyhydroxide catalysts at the salfiding temperature around 250℃, and were grown rapidly With the increase of temperature due to the sintering of fine crystallites. It was found that crystal growth of pyrrhotite could be dependent on catalyst forms. A crystallite size of pyrrhotite formed from γ-FeOOH was smaller than that from α-FeOOH.