A new strategy to effectively capture and recover SO2 based on the functional porous liquids

The modern fossil fuel utilisation industry has proposed higher requirements for SO 2 removal to meet cleaner production requirements, such as the reusability of desulfurisers, avoidance of equipment corrosion, and recovery of sulfur resources. This study constructed a novel type III porous liquids (PLs) which combine the fluidity of liquids and the permanent porosity of solid materials by uniformly dispersing porous metal-organic framework particles of NENU-3a into a steric solvent of polydimethylsiloxane , and used them for SO 2 capture and recovery. A novel desulfurisation system was developed using tert-butanol peroxide as the oxidant and water as the extractant. The endowed porosity of the PLs significantly improved the SO 2 capture performance, and the polydimethylsiloxane solvent acted as a protective screen to prevent the corrosion of SO 2 to the equipment. The prepared PLs exhibited excellent reusability owing to their structural stability. Furthermore, the captured SO 2 was fully oxidised to SO 4 2− due to the excellent catalytic oxidation activity of encapsulated polyoxometalates in NENU-3a, thus obtaining a high-purity sulfuric acid product. This work not only proposes a novel technology to realise the resource ability of SO 2 under environmentally friendly conditions but also opens a new window for the rational treatment of emitted SO 2 gas based on PLs to meet the new requirements for fossil fuel utilisation.