Composite materials(AZ-x) were prepared by mixing the nanosized HY zeolite and γ-Al_2 O_3 using the sol-gel mixing method and were employed as the support for NiMo catalysts(NiMo/AZ-x). These composites and catalysts...Composite materials(AZ-x) were prepared by mixing the nanosized HY zeolite and γ-Al_2 O_3 using the sol-gel mixing method and were employed as the support for NiMo catalysts(NiMo/AZ-x). These composites and catalysts were characterized by XRD, BET, TPD, TPR, HRTEM and FT-IR spectroscopy. Compared with the NiMo catalyst supported onγ-Al_2 O_3(NiMo/γ-Al_2 O_3), these NiMo/AZ-x catalysts show higher activity in the hydrodesulfurization(HDS) of FCC diesel,and the HDS activity increases with an increasing HY mass content in the composites, provided that the HY mass fraction does not exceed 20%. Compared with γ-Al_2 O_3, the introduction of nanosized HY zeolite can improve the porous structure of the composites,which can benefit the mass transfer of the reactant molecules. Furthermore,the nanosized HY zeolite in the composites can modify their surface properties which would increase the ratio of metal species to be transformed into reducible phase in low temperature region and modify the morphology of the MoS2 phases to form more multi-stacked MoS_2 active phases with increased dispersion of edges and corners of Mo atoms.展开更多
基金supported by the National Natural Science Foundation of China (Grant Nos. 21206197)the Shandong Provincial Natural Science Foundation under Grant 2016GSF117030the Promotive Research Fund for Excellent Young and Middle-aged Scientists of Shandong Province (BS2013CL021)
文摘Composite materials(AZ-x) were prepared by mixing the nanosized HY zeolite and γ-Al_2 O_3 using the sol-gel mixing method and were employed as the support for NiMo catalysts(NiMo/AZ-x). These composites and catalysts were characterized by XRD, BET, TPD, TPR, HRTEM and FT-IR spectroscopy. Compared with the NiMo catalyst supported onγ-Al_2 O_3(NiMo/γ-Al_2 O_3), these NiMo/AZ-x catalysts show higher activity in the hydrodesulfurization(HDS) of FCC diesel,and the HDS activity increases with an increasing HY mass content in the composites, provided that the HY mass fraction does not exceed 20%. Compared with γ-Al_2 O_3, the introduction of nanosized HY zeolite can improve the porous structure of the composites,which can benefit the mass transfer of the reactant molecules. Furthermore,the nanosized HY zeolite in the composites can modify their surface properties which would increase the ratio of metal species to be transformed into reducible phase in low temperature region and modify the morphology of the MoS2 phases to form more multi-stacked MoS_2 active phases with increased dispersion of edges and corners of Mo atoms.
