Synthesis of a porous deep eutectic solvent based on supramolecular deep eutectic solvent and its application in extractive−oxidative desulfurization

To solve the problem of the deep eutectic solvents synthesized with small volume hydrogen bond acceptors and hydrogen bond donors entering the cavity of pore generator and occupying their pore structure, supramolecular deep eutectic solvent (SDES) was firstly introduced to construct porous deep eutectic solvent (PDES). Thereby, a PDES was synthesized by using ZIF − 8 encapsulating peroxophosphotungstate (PPT) as pore generator and SDES composed of methyl-β-cyclodextrin (M − β − CD) and levulinic acid (LA) as steric hindrance solvents. The characterization results indicated that PPT was encapsulated successfully within ZIF − 8 to prepare [PPT@ZIF − 8]. [PPT@ZIF − 8] and [M − β − CD/LA] remain structure stable after forming PDES and [M − β − CD/LA] do not fill the cavity of [PPT@ZIF − 8]. The PDES [PPT@ZIF − 8][M − β − CD/LA] was applied for oil desulfurization and the desulfurization rate of dibenzothiophene in model oils could reach 100% within 2.5 h using H 2 O 2 as oxidant. The desulfurization by [PPT@ZIF − 8][M − β − CD/LA] combined the extractive desulfurization with [M − β − CD/LA] as extractant and the oxidative desulfurization with [PPT@ZIF − 8] as catalyst. Furthermore, [PPT@ZIF − 8][M − β − CD/LA] has excellent regeneration performance. This work will provide a new route to construct PDESs and will promote the industrial application of porous liquids.