Recent application of heteropolyacid-based ionic liquid catalysts

Heteropolyacid-based ionic liquids (HPAILs) have garnered a lot of attention over the past ‎several decades because of their peculiar physicochemical properties as catalysts. In the first ‎place, their Bronsted acidity is so high that it borders on the superacid zone. Secondly, they are ‎powerful catalysts that undergo fast redox changes even at room temperature. Their intricate ‎structure or component elements can be modified to achieve the same size, charge density, redox ‎potential, acidity, and solubility. Finally, their catalytic activity is stable after being utilized at ‎substoichiometric concentrations. It is considered that these elements are related to the ‎economy, the environment, and the ability to adapt. Because of this, we want to compile a ‎review article covering the history of HPAIL synthesis and its many variations, as well as any ‎new developments.