TiOz nanotubes （TiO2-NTs） were synthesized by the hydrothermal method. Co and Mo active components were supported on a series of the as-prepared TiO2-NTs samples which were calcined at different temperatures. The ef...TiOz nanotubes （TiO2-NTs） were synthesized by the hydrothermal method. Co and Mo active components were supported on a series of the as-prepared TiO2-NTs samples which were calcined at different temperatures. The effects of support calcination temperature of CoMo/TiOz- NTs catalysts on their catalytic performance were investigated for selective hydrodesulfurization （HDS）. The samples were characterized by means of the scanning electron microscopy （SEM）, the transmission electron microscopy （TEM）, N2 adsorption-desorption, X-ray diffraction （XRD）, Raman spectroscopy and H2 temperature-programmed reduction （Hz-TPR）. The experimental results revealed that TiOz-NTs support calcined under 500℃ can maintain the nanotubular structure with higher surface area and pore volume. Meanwhile, the obtained supported CoMo/TiO2-NTs catalysts exhibited weak metal-support interaction, more octahedral Mo6＋ species and high catalytic performance in selective HDS.展开更多
Catalytic hydrodesulfurization(HDS)technique is widely used for clean gasoline production.However,traditional HDS catalyst(CoMo/γ-Al_(2)O_(3))exhibits high hydrogenation performance of olefins(HYDO),resulting in the ...Catalytic hydrodesulfurization(HDS)technique is widely used for clean gasoline production.However,traditional HDS catalyst(CoMo/γ-Al_(2)O_(3))exhibits high hydrogenation performance of olefins(HYDO),resulting in the loss of gasoline octane number.To achieve high HDS/HYDO ratio,the key issue is to reduce the interaction between active metals and the support,therefore,in this research,the modified CoMo/γ-Al_(2)O_(3)catalysts with various boron amounts were investigated under traditional or microwave heating.The effects of preparing methods as well as boron amounts on the active phase,acidic properties and HDS catalytic activities were examined.Results show that the modification,especially under microwave treatment,can significantly weaken the interaction between the active component and the support by enlarging the surface area and pore diameter,and reducing the acidity of the support.As a result,the stacking numbers of MoS_(2) slabs were obviously improved by the modification and microwave treatment,contributing to higher edge/rim ratio,and resulting in higher HDS performance and selectivity to olefin.展开更多
文摘TiOz nanotubes （TiO2-NTs） were synthesized by the hydrothermal method. Co and Mo active components were supported on a series of the as-prepared TiO2-NTs samples which were calcined at different temperatures. The effects of support calcination temperature of CoMo/TiOz- NTs catalysts on their catalytic performance were investigated for selective hydrodesulfurization （HDS）. The samples were characterized by means of the scanning electron microscopy （SEM）, the transmission electron microscopy （TEM）, N2 adsorption-desorption, X-ray diffraction （XRD）, Raman spectroscopy and H2 temperature-programmed reduction （Hz-TPR）. The experimental results revealed that TiOz-NTs support calcined under 500℃ can maintain the nanotubular structure with higher surface area and pore volume. Meanwhile, the obtained supported CoMo/TiO2-NTs catalysts exhibited weak metal-support interaction, more octahedral Mo6＋ species and high catalytic performance in selective HDS.
基金the National Natural Science Foundation of China(Grant No.21476258).
文摘Catalytic hydrodesulfurization(HDS)technique is widely used for clean gasoline production.However,traditional HDS catalyst(CoMo/γ-Al_(2)O_(3))exhibits high hydrogenation performance of olefins(HYDO),resulting in the loss of gasoline octane number.To achieve high HDS/HYDO ratio,the key issue is to reduce the interaction between active metals and the support,therefore,in this research,the modified CoMo/γ-Al_(2)O_(3)catalysts with various boron amounts were investigated under traditional or microwave heating.The effects of preparing methods as well as boron amounts on the active phase,acidic properties and HDS catalytic activities were examined.Results show that the modification,especially under microwave treatment,can significantly weaken the interaction between the active component and the support by enlarging the surface area and pore diameter,and reducing the acidity of the support.As a result,the stacking numbers of MoS_(2) slabs were obviously improved by the modification and microwave treatment,contributing to higher edge/rim ratio,and resulting in higher HDS performance and selectivity to olefin.
