Abstract:

The V₂O₅/g⁃C₃N₄ catalyst was prepared by calcination method, using melamine, ammonium metavanadate, boric acid as precursors and methanol as solvent. The structure and morphology of the catalyst were characterized by X⁃Ray Diffraction (XRD), Fourier transform infrared spectroscopy (FT⁃IR), X⁃ray photoelectron spectroscopy (XPS), scanning tunneling microscope(SEM) and brunauer⁃emmett⁃teller(BET). The desulfurization ability of dibenzothiophene (DBT) in model oil was investigated using V₂O₅/g⁃C₃N₄ as catalyst, acetonitrile as extractant and H₂O₂ as oxidant. The effects of reaction temperature, amount of catalyst and extractant, n(H₂O₂)/n(S) molar ratio, and different sulfides on desulfurization rate were investigated. Under the optimum conditions: 5.0 mL model oil, 3.0 mL acetonitrile, n(H₂O₂)/n(DBT)=8, 0.02 g of catalyst, temperature was 30 ℃ and reaction time was 60 min, the desulfurization rate of DBT can reach 91.9%, which can also keep at a higher value at 85.7% after 5 times of catalyst regeneration.

Key words: V2O5/g?C3N4, Oxidative desulfurization, Dibenzothiophene (DBT), Melamine

摘要： 以三聚氰胺、偏钒酸铵、硼酸为前驱体，通过煅烧法制备V₂O₅/g⁃C₃N₄催化剂。采用XRD、FT⁃IR、XPS、SEM和BET等技术对催化剂的结构与形貌进行表征。以V₂O₅/g⁃C₃N₄为催化剂，乙腈为萃取剂，H₂O₂为氧化剂对模拟油中二苯并噻吩（DBT）的脱除进行考察。探究了反应温度、催化剂质量、萃取剂体积、n(H₂O₂)/n(S)以及不同硫化物等因素对脱硫效果的影响。在模拟油体积为5.0 mL、萃取剂乙腈体积为3.0 mL、n(H₂O₂)/n(S)=8、催化剂质量为0.02 g、反应温度为30 ℃和反应时间为60 min的最佳条件下，DBT的脱除率达到91.9%，经过5次催化剂再生后脱硫率仍可以达到85.7%。

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