Abstract
A series of KxMo/γ-Al2O3 catalysts (x = 1, 2, 4, 8), used for the catalytic synthesis of methanethiol from carbon disulfide and hydrogen, were prepared, and characterized by N2 adsorption–desorption, XRD, in situ pyridine adsorption FT-IR and NH3/CO2-TPD techniques. Experimental results showed that all the KxMo/γ-Al2O3 catalysts can undergo sulfurization process during the reaction, and the alkalinity of the catalysts was significantly enhanced with increasing in the molar ratio of K to Mo. In addition, the alkalinity of the catalysts was found to be conducive to the improvement of yield of methyl mercaptan, while the acidity of the catalysts significantly promoted the disproportionation of CH3SH–CH3SCH3 and the hydrogenation to CH4. The conversion of CS2 was found to be 100 % on all the catalysts in the evaluated temperature range from 533 to 653 K. The optimal yield of CH3SH was found to be 94.6 % over K4Mo/γ-Al2O3 catalyst, when the reaction temperature was at 583 K.
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