Chinese Journal of Catalysis ›› 2024, Vol. 57: 154-170.DOI: 10.1016/S1872-2067(23)64573-5

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Controlled construction of Co3S4@CoMoS yolk-shell sphere for efficient hydrodesulfurization promoted by hydrogen spillover effect

Wenjing Baoa, Chao Fenga,c, Shuyan Maa, Dengwei Yana, Cong Zhanga, Changle Yuea, Chongze Wanga, Hailing Guoa, Jiqian Wanga, Daofeng Sunb, Yunqi Liua, Yukun Lua,*()   

  1. aState Key Laboratory of Heavy Oil Processing, College of Chemistry and Chemical Engineering, China University of Petroleum (East China), Qingdao 266580, Shandong, China
    bState Key Laboratory of Heavy Oil Processing, School of Material Science and Engineering of UPC, China University of Petroleum (East China), Qingdao 266580, Shandong, China
    cKey Laboratory of Biofuels, Qingdao Institute of Bioenergy and Bioprocess Technology, Chinese Academy of Sciences, Qingdao 266101, Shandong, China
  • Received:2023-11-02 Accepted:2023-11-27 Online:2024-02-18 Published:2024-02-10
  • Contact: * E-mail: lyk@upc.edu.cn (Y. Lu).
  • Supported by:
    National Natural Science Foundation of China(21878336);National Natural Science Foundation of China(U22B20144);Shandong Provincial Natural Science Foundation(ZR2023MB004);Fundamental Research Funds for the Central Universities(23CX03001A)

Abstract:

A yolk-shell structured Co3S4@CoMoS catalyst was prepared through Oswald ripening method and subsequently used for hydrodesulfurization (HDS) reaction. The shells, constructed from Co-promoted MoS2 nanosheets, possess abundant active sites and facilitate the adsorption of reactants through the development of pore channels. The MoS2 sheets are arranged in a staggered and convoluted manner, creating numerous defect sites. The shorter MoS2 slabs provide a wide distribution of reactive sites, ensuring efficient reactions. The Co3S4 species within the inner core acts as an auxiliary active phase, inducing the hydrogen spillover effect in the HDS system. This facilitates the transfer of active hydrogen species to the CoMoS shell, where both CoMoS and Co3S4 phases synergistically enhance the HDS reaction. The Co3S4@CoMoS catalyst achieved up to 99.2% dibenzothiophene (DBT) conversion and 94.9% 4,6-dimethyldibenzothiophene conversion at the lower dosage (30 mg). The structure-activity relationships between active phase and HDS activity were investigated via in-situ infrared spectroscopy and other characterizations as well as density functional theory calculations.

Key words: Hydrodesulfurization, Hydrogen spillover effect, Yolk-shell structure, CoMoS active phase, Dual active phase synergy