钨酸铋的制备及其催化氧化脱硫性能

催化氧化脱硫法因反应条件温和、可高效深度脱除燃料油中二苯并噻吩(DBT)类硫化物，是一种有潜力的非加氢脱硫方法。以钨酸钠和五水合硝酸铋为原料，采用直接沉淀法和水热法制备钨酸铋(Bi₂WO₆)。采用傅里叶变换红外光谱(FT-IR)、X-射线衍射(XRD)、电子扫描显微图像(SEM)、能量色散X射线光谱(EDS)和N₂等温吸附-脱附等分析方法对其结构、组成、表面形貌和比表面积进行表征。分别以DBT、苯并噻吩(BT)、4-甲基-二苯并噻吩(4-MDBT)和4,6-二甲二苯并塞吩(4,6-DMDBT)为代表性硫化物，以正癸烷为溶剂、十四烷为内标物配制含硫模拟油，以制备的Bi₂WO₆为催化剂、过氧化氢(H₂O₂)为氧化剂、乙腈(CH₃CN)为萃取剂构建催化氧化脱硫体系，系统地考察了其催化氧化脱硫性能。结果表明，水热法制备的Bi₂WO₆(BWO-2)表现出较优的脱硫性能。在反应温度...

Preparation and Its Catalytic Oxidative Desulfurization Properties of Bismuth Tungstate

Catalytic oxidative desulfurization method can deeply and efficiently remove dibenzothiophene (DBT) sulfur-containing compounds in fuel oil due to its mild reaction conditions. It is a non-hydrodesulfurization method with potential application value. The samples of bismuth tungstate (Bi₂WO₆) were prepared using sodium tungstate and bismuth nitrate pentahydrate as raw materials by direct precipitation method and hydrothermal method. Their structure, composition, surface morphology and specific surface area were characterized by means of X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FT-IR), electron microscope (SEM), energy dispersive X-ray spectroscopy (EDS), and N₂ isotherm adsorption-desorption method. Taking DBT, benzothiophene (BT), 4-methyldiphenylpropythipphere (4-MDBT), and 4,6-dimethyldiphenylpropythipphere (4,6-DMDBT) as representative sulfur compounds, the sulfur-containing simulated oil was made up by using n-decane as solvent and n-tetradecane as internal standard. A catalytic oxidation desulfurization system was constructed through the prepared Bi₂WO₆ as catalyst, hydrogen peroxide (H₂O₂) as oxidant and acetonitrile (CH₃CN) as extractant, and the desulfurization performance was systematically investigated. The results indicated that Bi₂WO₆prepared by hydrothermal method has excellent desulfurization performance. The desulfurization rate of BWO₂ for simulated oil containing DBT reached 99.7% in 75 min at the reaction temperature of 60 ℃. The kinetic fitting results indicated that the catalytic oxidation desulfurization of DBT simulated oil by BWO₂ accords with the first-order kinetic equation, and its activation energy is 55.45 kJ/mol.