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Oxidative Desulfurization of Fuels Catalyzed by Fenton‐Like Ionic Liquids at Room Temperature

2011; Wiley; Volume: 4; Issue: 3 Linguagem: Inglês

10.1002/cssc.201000251

1864-564X

Yunqing Jiang, Wenshuai Zhu, Huaming Li, Sheng Yin, Hua Liu, Qingjie Xie,

Catalysis for Biomass Conversion

Abstract Oxidation of the sulfur‐containing compounds benzothiophene (BT), dibenzothiophene (DBT), and 4,6‐dimethyldibenzothiophene (4,6‐DMDBT) has been studied in a desulfurization system composed of model oil, hydrogen peroxide, and different types of ionic liquids [(C 8 H 17 ) 3 CH 3 N]Cl/FeCl 3 , [(C 8 H 17 ) 3 CH 3 N]Cl/CuCl 2 , [(C 8 H 17 ) 3 CH 3 N]Cl/ZnCl 2 , [(C 8 H 17 ) 3 CH 3 N]Cl/SnCl 2 , [(C 4 H 9 ) 3 CH 3 N]Cl/FeCl 3 , [C 10 H 21 (CH 3 ) 3 N]Cl/FeCl 3 , [(C 10 H 21 ) 2 (CH 3 ) 2 N]Cl/FeCl 3 . Deep desulfurization is achieved in the Fenton‐like ionic liquid [(C 8 H 17 ) 3 CH 3 N]Cl/FeCl 3 at 25 °C for 1 h. The desulfurization of DBT reaches 97.9 %, in consuming very low amount of [(C 8 H 17 ) 3 CH 3 N]Cl/FeCl 3 (only 0.702 mmol). The reaction conditions, for example, the amount of [(C 8 H 17 ) 3 CH 3 N]Cl/FeCl 3 or H 2 O 2 , the temperature, and the molar ratio of FeCl 3 to [(C 8 H 17 ) 3 CH 3 N]Cl, are investigated for this system. The oxidation reactivity of the different sulfur‐containing compounds is found to decrease in the order of DBT>BT>4,6‐DMDBT. The desulfurization system can be recycled six times without significant decrease in activity. The sulfur level of FCC gasoline could be reduced from 360 ppm to 110 ppm.