Korean Journal of Chemical Engineering, Vol.31, No.8, 1368-1376, 2014
Presulfidation and activation mechanism of Mo/Al2O3 catalyst sulfided by ammonium thiosulfate
Mo/Al2O3 catalyst was presulfided with (NH4)2S2O3 to elucidate presulfidation and activation mechanism. It is illustrated that the Mo oxide is firstly partially sulfided during presulfidation and then in situ reduced into MoS2-x in activation, and finally sulfided to active state during hydrodesulfurization (HDS). A synergistic effect between the S2- and S6+ ions in (NH4)2S2O3 produces a positive influence on the HDS performance. The S2- ions contribute to the sulfidation
of Mo ions, while the S6+ species interact with Al2O3 support, weakening the interaction of active species with support.
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