Extractive catalytic oxidative desulfurization (ECODS) is the one of the recent methods used in fuel desulfurization which involved the use of catalyst in the oxidative desulfurization of diesel fuel. This study is aimed to test the effectiveness of synthesized choline chloride (ChCl) based deep eutectic solvent (DES) in fuel desulfurization via ECODS method, with the presence of graphene oxide (GO) as catalyst and hydrogen peroxide (H₂O₂) as oxidant. In this study, 16 DESs based on choline chloride were synthesized using glycerol (GLY), ethylene glycol (EG), tetraethylene glycol (TEG) and polyethylene glycol (PEG). The characterization of the synthesized DES was carried out via Fourier transform infrared spectroscopy (FTIR) analysis, density, and viscosity determination. According to the screening result, ChCl-PEG (1:4) was found to be the most effective DES for desulfurization using ECODS method, with a removal of up to 47.4% of sulfur containing compounds in model oil in just 10 min per cycle after the optimization of the reaction parameters, and up to 95% desulfurization efficiency could be achieved by six cycles of desulfurization. It is found that the addition of GO as catalyst does not increase the desulfurization performance drastically; hence, future studies for the desulfurization performance of DESs made up from ChCl and PEG and its derivatives can be done simply by using extraction desulfurization (EDS) method instead of ECODS method, for cost reduction purpose and easier regulation of DES waste into environment.

中文翻译：

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氧化石墨烯存在下基于胆碱氯化物的低共熔溶剂的脱硫性能

萃取催化氧化脱硫（ECODS）是用于燃料脱硫的最新方法之一，其中涉及在柴油的氧化脱硫中使用催化剂。这项研究的目的是在氧化石墨烯（GO）作为催化剂和过氧化氢（H ₂ O ₂）存在的情况下，通过ECODS方法测试基于氯化胆碱（ChCl）的深共熔溶剂（DES）在燃料脱硫中的有效性。）作为氧化剂。在这项研究中，使用甘油（GLY），乙二醇（EG），四乙二醇（TEG）和聚乙二醇（PEG）合成了16种基于氯化胆碱的DES。合成的DES的表征通过傅立叶变换红外光谱（FTIR）分析，密度和粘度测定进行。根据筛选结果，发现ChCl-PEG（1：4）是使用ECODS方法进行脱硫的最有效DES，在每次循环后仅10分钟内即可去除模型油中高达47.4％的含硫化合物。通过六个脱硫循环，可以优化反应参数，并达到高达95％的脱硫效率。已经发现，加入GO作为催化剂并不能显着提高脱硫性能。因此，