介孔SBA-16负载Nb2O5光催化脱硫催化剂OA北大核心CSTPCD

Nb2O5/SBA-16 catalyst was prepared with impregnation method,and the structure and properties of the catalyst were characterized by XRD,FTIR,N2 adsorption-desorption,UV-Vis,SEM,TEM,and XRF.The photocatalytic oxidative desulfurization activity of the catalyst was investigated using dodecane solution containing dibenzothiophene as the simulated oil,30%(w)H2O2 and methanol as the oxidant and the extractant respectively.The process conditions were optimized and the catalytic mechanism was proposed.The experimental results show that Nb2O5/SBA-16 catalyst maintains a highly ordered mesoporous structure with high specific surface area and uniform dispersion of active components.The reaction follows first-order kinetics.When 20%(w)Nb2O5/SBA-16 is used as catalyst,the catalyst amount is 1%(w),the O/S molar ratio is 10∶1,and the volume ratio of extractant to simulated oil is 1∶1,the best desulfurization rate is 98.06%,and is still high after 6 cycles.The main active intermediate species in the reaction are superoxide radicals and holes.