W改性SiO_2催化剂催化氧化脱除苯并噻吩的性能

Catalytic performance of W-modified SiO_2 catalyst in oxidative desulfurization of dibenzothiophene

采用溶胶-凝胶法制备了W改性SiO2催化剂,并通过X射线衍射(XRD)、红外光谱(FTIR)、N2吸附(BET)、扫描电镜(SEM)等方法对催化剂进行表征。以苯并噻吩(BT)/石油醚模拟油为原料、H2O2为氧化剂,研究了催化剂催化氧化脱硫性能,考察了溶剂及用量、反应温度、氧化剂用量、催化剂用量、反应时间对苯并噻吩脱硫率的影响。结果表明,催化剂中W以WO3晶相存在,引入W后催化剂的比表面积有所降低。在模拟油原料20 mL、催化剂用量0.04 g、H2O2/S摩尔比8、乙腈/模拟油体积比0.3∶1、65℃下反应60 min时,模拟油脱硫率可达99.6%。

The W-modified SiO2 catalyst was prepared by sol-gel method and characterized by X-ray diffraction（XRD）,Fourier transform infrared spectroscopy（FT-IR）,N2-adsorption specific surface area measurement（BET）and scanning electron microscopy（SEM）.The catalytic oxidative desulfurization performance was studied with the simulated oil of benzothiophene（BT）sulfur as feedstock,H2O2 as oxidant.The effects of solvent,solvent dosage,reaction temperature,H2O2 dosage,catalyst dosage and reaction time on desulfurization performance of BT were investigated.The results show that the predominant phase of W in catalyst was WO3,the introduction of W led to the reduction of the specific surface area of catalyst.Under the condition of simulated oil sample 20mL,catalyst 0.04 g,H2O2 /S molar ratio of 8,acetonitrile/simulated oil volume ratio of 0.3∶1,at 65 ℃,reaction time of 60 min,the desulfurization ratio of simulated oil reach to 99.6%.