Abstract
A series of Co-Mo sulfide catalysts with tube-like hollow structure were prepared by a low temperature pre-sulfurization method using various CoMoO4 as precursors synthesized by coprecipitation process at different temperature. The crystallite structure of CoMoO4 precursors determined the properties of Co-Mo sulfide catalysts, including pore structure, concentration of CoMoS active phase, microstructure of MoS2 slabs, and desulfurization activity. The higher temperature led to better crystallinity of CoMoO4 precursor, resulting in less CoMoS active phase and fewer Mo atoms at the corner sites of the pre-sulfurized catalyst. In addition, the MoS2 slabs with shorter length and more stacking layers (especially Co-promoted MoS2 slabs) in the catalysts are also formed at appropriate precursor preparation temperature, which are favorable for forming more unsaturated coordination sites (especially corner sites). According to the results of hydrodesulfurization of dibenzothiophene on the Co-Mo sulfide catalysts, the reaction rate and the production yield are highly dependent on the number of surface-active centers, while the activity is mainly attributed to the Type II CoMoS species.
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This work is financially supported by the Shandong Provincial Natural Science Foundation of China (Grant No. ZR2020MB029) and the State Key Laboratory of Heavy Oil Processing (Grant No. 2018-02).
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Shandong Provincial Natural Science Foundation of China, ZR2020MB029, The State Key Laboratory of Heavy Oil Processing, 2018-02
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Zhengting Xiao: Formal analysis, Investigation, Writing-Original draft, Visualization. Qingyang Li: Investigation. Guangci Li: Conceptualization, Methodology, Writing-Review & Editing, Funding acquisition. Wentai Wang: Writing-Review & Editing, Supervision. Xuebing Li: Supervision. Song Chen: Formal analysis. Chunhu Li: Supervision.
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Xiao, Z., Li, Q., Li, G. et al. Influence of the crystalline structure of Co-Mo precursors on the hydrodesulfurization performance of unsupported tube-like Co-Mo sulfide catalysts. J Porous Mater (2024). https://doi.org/10.1007/s10934-024-01592-x
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DOI: https://doi.org/10.1007/s10934-024-01592-x