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- W2034133418 abstract "In this paper, the effect of catalytic support and sulfiding method on the chemical state of supported Co-MO catalysts is studied by XPS. After sulfidation with in-situ method, the majority of molybdenum in CNT supported CoMo catalyst is transferred to a species with a formal chemical state Mo(IV) in MoS2 phase, and the rest to Mo(V) which consists of Mo coordinated both to O and S, such as MoO2S22-- and MoO3S2-−. In case of CoMo/γ-Al2O3 catalyst sulfided with in-situ method, a fraction of molybdenum is transferred to formal state Moo in the form of MoS2, but there is still a mount of unreduced Mo(VI) phase which is difficult to be sulfided. In CoMo/CNT catalytic system sulfided with ex-situ method, Mo(IV) in the form of MoS2 is detected along with a portion of unreduced Mo(VI) phase, suggesting that not all the Mo phases are reduced and sulfided by ex-situ method. As for CoMo/γ-Al2O3, a portion of molybdenum is sulfided to intermediate reduced state Mo(V) which consists of Mo coordinated both to O and S. such as MoO2S2–2 and MoO3S2–, in addition, there is still a fraction of unreduced Mo(VI) phase. XPS analyses results suggest that CNT support facilitates the reduction and sulfidation of active species to a large extent, and that alumina support strongly interacts with active species, hereby producing a fraction of phase which resists complete sulfiding. Catalytic measurements of catalysts in the HDS of dibenzothiophene (DBT) show that CoMo/CNT catalysts are of higher HDS activity and selectivity than CoMo/γ-A2O3 catalyst, which is in good relation with the sulfiding behavior of the corresponding catalyst." @default.
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- W2034133418 date "2010-08-26" @default.
- W2034133418 modified "2023-09-23" @default.
- W2034133418 title "XPS characterization of carbon nanotube supported CoMo hydrodesulfurization catalysts" @default.
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- W2034133418 doi "https://doi.org/10.1002/cjoc.20040221108" @default.
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