Department of Chemistry, Faculty of Physics & Chemistry, Alzahra University, P.O. Box, Tehran, 1993891176, Iran.
Environ Sci Pollut Res Int. 2020 Nov;27(32):39923-39945. doi: 10.1007/s11356-020-10310-4. Epub 2020 Aug 12.
Strict environmental laws have been put in place around the world to reduce the amount of sulfur in the fuel to reduce the emissions of harmful gases from fuel combustion and improve air quality. Therefore, extensive researches have been undertaken to devise effective processes or to improve the desulfurization processes. Among the desulfurization processes, the oxidative desulfurization (ODS) process is a promising method to achieve very low and near-zero sulfur content of the fuel. In this process, sulfur compounds are converted to the corresponding sulfone by a catalyst and in the presence of an oxidant. The obtained compounds by polar solvents or adsorbents are removed from the fuel. In recent decades, extensive studies have been carried out on the catalysts used in the oxidative desulfurization process. In this review, a comprehensive survey has been performed on heterogeneous catalysts used in the oxidative desulfurization process. According to the reported researches, the heterogeneous catalysts used can be divided into five groups: ionic liquids, carbon materials, polyoxometalates, transition metal oxides stabilized on porous solid substrates, and metal-organic frameworks. The proposed mechanisms with different catalysts have also been studied in this work.
为了减少燃料中的硫含量，以减少燃料燃烧产生的有害气体排放并改善空气质量，全世界都制定了严格的环境法规。因此，人们进行了广泛的研究，以设计有效的工艺或改进脱硫工艺。在脱硫工艺中，氧化脱硫（ODS）工艺是实现燃料低硫和近零硫含量的很有前途的方法。在该工艺中，通过催化剂并在氧化剂的存在下，将硫化合物转化为相应的砜。用极性溶剂或吸附剂从燃料中除去所得到的化合物。在过去的几十年中，人们对氧化脱硫工艺中使用的催化剂进行了广泛的研究。在这篇综述中，对氧化脱硫工艺中使用的多相催化剂进行了全面的调查。根据报道的研究，所使用的多相催化剂可分为五类：离子液体、碳材料、多金属氧酸盐、多孔固体载体上稳定的过渡金属氧化物和金属-有机骨架。在这项工作中还研究了不同催化剂的提出的机理。
