Research progress of ionic liquid-based heteropolyacids in fuel oxidation desulfurization
Oxidative desulfurization,with features such as mild reaction conditions and low cost,is widely used in fuel oil desulfurization.In recent years,researchers have found that the structure of zwitterion in ionic liquid is adjustable,which allows highly efficient multi-acid catalysts to be prepared in ionic liquid through physicochemical method,so that conducive conditions for deeper oxidation desulfurization could be attained.This review summarizes the synthesis and classification of ionic liquid polyacids and describes in detail the characteristics of simple ionic liquid polyacid and loaded ionic liquid polyacid with metal-organic frame or inorganic non-metallic materials as the carrier,as well as its research progress in the field of fuel oxidation desulfurization,including desulphurization desulfurization rate and reuse times.All the primary desulfurization efficiency of simple ionic solution with multiple acids are higher than 80%,with the highest up to 99.2%,whereas the desulfurization rate of loaded ionic liquid polyacid is above 98%,and most of them are as high as 100%,and can be reused up to 13 times.Many researchers agree that the loaded ionic liquid polyacid can not only effectively enhance the catalytic activity of the polyacid,but also improve the thermal stability and reutilization of the catalyst.It has a good performance in fuel oxidation and desulfurization.Finally,the paper points out that development of ionic liquid polyacid with good catalytic performance,good reutilization and high efficiency is the future research direction.
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