M 5740 (OTTO) Molybdenum disulphide, ~6 μm, 99% Cas 1317-33-5 - used to catalyze hydrogen evolution at a water 1,2-dichloroethane interface. M 5740 (OTTO) Molybdenum disulphide, ~6 μm, 99% Cas 1317-33-5 - used also as a catalyst used for desulfurization in petroleum refineries.