Abstract
Exposure to air at room temperature (passivation) caused a substantial increase in the hydrodesulphurization activity of a sulphided Co-Mo/Al 2O 3 catalyst. EXAFS measurements showed that passivation did not change the structure of the Co sites. Because of this, and because a Co-Mo/C catalyst did not show any increase after passivation, it is concluded that a breakage of Mo-O-Al interactions and a concurrent transition of Co-Mo-S type I into Co-Mo-S type II is responsible for the activity increase. This suggestion is supported by the fact that a Co-Mo(NTA)/Al 2O 3 catalyst, which contains large amounts of Co-Mo-S type II, showed a relatively small activity increase.
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