Recent Advances in Catalytic Oxidation of Organic Sulfides: Applications of Metal-Ionic Liquid Catalytic Systems.

Xiao Bing Liu,Jin Tan,Chen Chen,Qi Rong,Yu Lin Hu

doi:10.3389/fchem.2021.798603

Abstract

Catalytic oxidation of organic sulfides is of considerable significance in industrial chemistry and fuel industry. Therefore, numerous methods have been developed for the oxidation. Metal-containing ionic liquid-based catalysts can catalyze the selective oxidation reactions and are highly used in chemical processes, which have also been used as effective solvents, reaction media, extractants, and catalysts for the oxidation of organic sulfides including oxidative desulfurization of fuel oil. Recently, much attention is being drawn to the preparation of heterogenous catalysts based on the immobilization of metal- or nonmetal-containing ILs on diverse solid supports, which can be easily separated after the completion reaction and recycled. Therefore, there is still an increasing interest in developing new and efficient catalytic procedures for the oxidation of organic sulfides. In this review, we have outlined the recent advances in catalytic oxidation of organic sulfides including oxidative desulfurization of fuel oil. The versatilities and adaptabilities of metal–ionic liquid catalytic systems in the selective oxidation of sulfides are considered a powerful research field in these transformations.

Highlights

Ionic liquids (ILs) have been considered an encouraging class of functional and green materials because of their unique properties such as non-volatility, non-flammability, adjustable structure, thermal and chemical stability, and nonexplosion
Various novel concepts of efficient and recyclable heterogenous catalytic systems based on supported ILs have been developed, which have been designed via the immobilization of metal- or nonmetal-containing ILs on diverse solid supports, which served as highly efficient catalysts in catalytic processes combining the unique properties of ILs and the attractive features of easy separation and recyclability (Xin and Hao, 2014; Marinkovic et al, 2019; Gupta et al, 2020)
We explore the current trends in the research directions toward the catalytic oxidation of organic sulfides and oxidative desulfurization in the presence of metal-containing ionic liquid-based catalytic systems, in which ILs and supported ILs are used as solvents, extractants, reaction media, catalysts, or their combinations during catalytic processes

Summary

Introduction

Ionic liquids (ILs) have been considered an encouraging class of functional and green materials because of their unique properties such as non-volatility, non-flammability, adjustable structure, thermal and chemical stability, and nonexplosion. The immobilization of ILs onto various polymeric and inorganic solid supports for the formation of functional-supported ILs has attracted a surge of interest in industrially important catalytic processes. Such supported IL heterogenous catalytic systems reduce cost and enhance catalytic efficiency Various novel concepts of efficient and recyclable heterogenous catalytic systems based on supported ILs have been developed, which have been designed via the immobilization of metal- or nonmetal-containing ILs on diverse solid supports, which served as highly efficient catalysts in catalytic processes combining the unique properties of ILs and the attractive features of easy separation and recyclability (Xin and Hao, 2014; Marinkovic et al, 2019; Gupta et al, 2020)

Objectives

Findings

Conclusion