Visible-light Photocatalysts For Denitrogenation Of Fuel Oil:Preparation And Characterization

TiO2carrier was prepared by sol-gel firstly, highly crystalline metastable bismuth titanate (Bi2oTiO32) samples were synthesized via combined ultrasonic resonance and impregnation method and Cu2O/TiO2was prepared by the same method. The photocatalysts Sr-doped spent equilibrium catalysts were successfully prepared by stirring method. The samples were characterized by X-ray diffraction (XRD), N2adsorption-desorption (BET), UV-Vis diffuser reflectance (DRS), X-ray photoelectron spectroscopy (XPS) and others. The feasibility of using the three catalysts as photocatalyst to remove nitrogen-containing compounds (NCC) in fuel oil was explored for the first time under visible light irradiation. At same time, the impacts on visible light photocatalytic activity of samples were studied under the different preparation condition of catalysts. The experimental results show that Bi2oTiO32, Cu2O/TiO2and Sr-doped spent equilibrium catalysts have excellent photocatalytic denitrogenation performance when Bi(NO3)3, Cu(NO3)2,Sr(NO3)2as modifying agent and loading concentration of0.5mol/L, calcination temperature of400℃and calcination time of5h, meanwhile the all denitrogenation rate of model oil containing pyridine can achieve above85.0%under visible light for150min in the absence of0.05g photocatalyst. To same extent, the photocatalytic performance of denitrogenation was affected by the different preparation condition and photocatalytic reaction condition. The mechanism of denitrogenation focus on Bi20TiO32and it maybe due to the oxidation-reduction can take place on the surface of catalyst between photon-generated holes and NCC and nitrogen compounds finally transform into ammonia.