Sulfurization and reduction of V2O3-MoO
2 catalyst have been studied kinetically.V
2O
3 is not sulfurized with H
2S at lower temperature than 480°C, but MoO
2is sulfurized to MoS
2+x (x=0.3) with CS2, H
2S, and thiophene in the temperature range 400∼480°C.The reduction of MoS
2+x with H
2 is difficult at 400°C, but it proceeds slowly to MoS
1.86at 600°C.
Sulfurization rate of this MoS
1.86were measured.The kinetic orders of sulfurization were1.2th, 0.5th and 0.9th for CS
2, H
2S and thiophen respectively, and the reactivities of these compounds decreased in the preceding order.
The catalyst of molar ratio V
2O
3/Mo
O2=6was sulfurized most easily, so it was understood that the sulfurization process was the main step in the mechanism of hydrodesulfurization, for the desulfurization activity per unit area of catalyst was maximum at this composition as shown in the preceding paper.
Further, from the results of electric conductivity measurements of the catalyst, it was supposed that the catalysis displayed activity under the co-operation betweenV
2O
3 (n-type semiconductor) and MoS
2-x (p-type semiconductor).
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