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Silicotungstate@ZIF-67 as an effective catalyst for an extraction and oxidative desulfurization system
Lijun Xu1, Qian Tong1, Bing Hu1
1School of Materials and Chemical Engineering, Hubei University of Technology Wuhan 430068 People's Republic of China hubing@hbut.edu.cn.
Abstract:
Through a simple room-temperature process, different amounts of Keggin-type quaternary ammonium silicotungstate were successfully encapsulated into the metal-organic framework (MOF) material ZIF-67. The catalysts were characterized using Fourier transform infrared (FT-IR) spectroscopy, X-ray powder diffraction (XRD), scanning electron microscopy (SEM), and BET analysis. An extraction and catalytic oxidation desulfurization system was studied using H2O2 as an oxidant and a deep eutectic solvent (DES) as an extractant. Using the 43.06%-SiW12@ZIF-67 composite under optimal reaction conditions, DBT present in a model oil could be deeply and effectively removed. The catalyst was reused 6 times, and the desulfurization rate still exceeded 90%. Finally, a possible desulfurization mechanism is proposed.
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