Stabilization effect of Co for Mo phase in hydrodesulfurization catalysts studied with X-Ray photoelectron spectroscopy |
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Authors: | Yasuaki Okamoto Hajime Nakano Takafumi Shimokawa Toshinobu Imanaka Shiichiro Teranishi |
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Affiliation: | Department of Chemical Engineering, Faculty of Engineering Science, Osaka University, Toyonaka, Osaka, Japan |
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Abstract: | The promotional effects of Co in hydrodesulfurization (HDS) catalysts were studied by means of X-ray photoelectron spectroscopy. The higher MoO3-content catalysts (10 and 20 wt% MoO3) contain mobile Mo, which migrates from the pores to the outermost surface layers of the catalysts and segregates to form less active crystalline MoS2 during the HDS reaction, while in the case of (5 wt% MoO3) catalyst: no migration of Mo was observed. It is revealed that the Co in catalyst inhibits the migration and segregation of Mo and that it keeps Mo effective for the HDS reaction, since no surface enrichment of Mo was observed. It is concluded that stabilization of the Mo monomolecular layer is the main role of Co. The active species of Mo is suggested to have the composition of S/Mo(IV) = 1 on the basis of the sulfur contents of the catalysts under the mild HDS reaction conditions. |
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