Study on reduction of MoS2 powders with activated carbon to produce Mo2C under vacuum conditions

A method of preparing Mo2C via vacuum carbothermic reduction of MoS2in the temperature range of 1350-1550℃C was pro-posed. The effects of MoS2-to-C molar ratio (α , α = 1:1, 1:1.5, and 1:2.5) and reaction temperature (1350 to 1550℃C) on the reaction were studied in detail. The phase transition, morphological evolution, and residual sulfur content of the products were analyzed by X-ray diffrac-tion, field-emission scanning electron microscopy, and carbon-sulfur analysis, respectively. The results showed that the complete decompo-sition of MoS2under vacuum is difficult, whereas activated carbon can react with MoS2under vacuum to generate Mo2C. Meanwhile, higher temperatures and the addition of more carbon accelerated the rate of carbothermic reduction reaction and further decreased the residual sulfur content. From the experimental results, the optimum molar ratio α was concluded to be 1:1.5.