Combined Extraction鈥揙xidation System for Oxidative Desulfurization (ODS) of a Model Fuel

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• 作者：Yajie Tian ; Yue Yao ; Yanhui Zhi ; Lijun Yan ; Shuxiang Lu
• 刊名：Energy & Fuels
• 出版年：2015
• 出版时间：February 19, 2015
• 年：2015
• 卷：29
• 期：2
• 页码：618-625
• 全文大小：404K
• ISSN：1520-5029

文摘

An efficient extraction鈥搊xidation catalytic system for deep desulfurization of a model fuel was explored. First, Mo/纬-Al₂O₃ catalysts were prepared using an impregnation method and were characterized using X-ray diffraction, temperature-programmed reduction, and N₂ physical adsorption isotherms. Acetonitrile, methanol, N,N-dimethylformamide, N-methylpyrrolidone, and H₂O were added to investigate the influences of different extracting agents for extraction鈥搊xidation desulfurization. Acetonitrile showed synergistic action for dibenzothiophene oxidation and a comparatively low dissolving capacity for aromatic compounds. Under a n(H₂O₂)/n(S) molar ratio of 2.3 and v(oil)/v(acetonitrile) of 3:1, benzothiophene, dibenzothiophene, and 4,6-dimethyldibenzothiophene were almost completely removed in the presence of the 16 wt % Mo/纬-Al₂O₃ catalyst over 40 min at 333 K. A reaction pathway based on extraction鈥搊xidation was proposed in which the sulfur compounds were transferred to the extracting phase before oxidizing to form sulfones in the extracting phase. The extraction process was rapid relative to the oxidation process. The advantages of the extraction鈥搊xidation catalytic system are that a high sulfur removal can be achieved under a lower n(H₂O₂)/n(S) molar ratio and that the stability of the catalyst is significantly improved.