The essential role of Co on the MoS_(2)catalyst in selective hydrodesulfurization(HDS)of FCC gasoline was investigated with ammonium tetrathiomolybdate supported on alumina modified with various amount of Co sulfide.A...The essential role of Co on the MoS_(2)catalyst in selective hydrodesulfurization(HDS)of FCC gasoline was investigated with ammonium tetrathiomolybdate supported on alumina modified with various amount of Co sulfide.According to the data obtained by XRD,HRTEM,XPS,H 2-TPR and Py-FTIR analysis,the Co species could significantly affect the microstructure and composition proportion of the active phase,and thus induced the enormous differences in catalytic properties.The evaluation results demonstrated that the Co atoms tending to form the CoMoS phase as Co/Mo(atomic ratio)<0.2 could greatly improve the HDS activity,but slightly improve the hydrogenation(HYD)activity of olefins.The spillover hydrogen produced by the formation of Co 9S 8 phase as 0.2<Co/Mo(atomic ratio)<0.6 greatly improved the HDS activity,but showed almost no effect on the HYD of olefins.The excess Co could inevitably form some large size Co 9S 8 phase as Co/Mo(atomic ratio)>0.6,which would hinder the mutual contact of the reactants and the active sites,and thus lead to the decrease of the HDS activity and selectivity.The obtained results were useful for developing highly effective hydrotreating catalyst.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
基金The project was supported by the National Natural Science Foundation of China(U1662119,21776314)the National Key Research and Development Program of China(2017YFB0306600)+3 种基金the Shandong Provincial Natural Science Foundation of China(ZR2016BL22)the Qingdao Applied Basic Research Project(17-1-1-73-jch)the Fundamental Research Funds for the Central Universities(17CX02061)the State Key Laboratory of Heavy Oil Processing(SLKZZ-2017005).
文摘The essential role of Co on the MoS_(2)catalyst in selective hydrodesulfurization(HDS)of FCC gasoline was investigated with ammonium tetrathiomolybdate supported on alumina modified with various amount of Co sulfide.According to the data obtained by XRD,HRTEM,XPS,H 2-TPR and Py-FTIR analysis,the Co species could significantly affect the microstructure and composition proportion of the active phase,and thus induced the enormous differences in catalytic properties.The evaluation results demonstrated that the Co atoms tending to form the CoMoS phase as Co/Mo(atomic ratio)<0.2 could greatly improve the HDS activity,but slightly improve the hydrogenation(HYD)activity of olefins.The spillover hydrogen produced by the formation of Co 9S 8 phase as 0.2<Co/Mo(atomic ratio)<0.6 greatly improved the HDS activity,but showed almost no effect on the HYD of olefins.The excess Co could inevitably form some large size Co 9S 8 phase as Co/Mo(atomic ratio)>0.6,which would hinder the mutual contact of the reactants and the active sites,and thus lead to the decrease of the HDS activity and selectivity.The obtained results were useful for developing highly effective hydrotreating catalyst.
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.
