Facile Synthesis of Alkaline Ternary Deep Eutectic Solvents: Application for Effective and Reversible SO₂ Uptake

Abstract

Effective capture and recycling of SO2 are of great significance to environmental protection and high-value utilization. Herein, a promising strategy for effective and reversible capture of SO2 was proposed using alkaline ternary deep eutectic solvents (DESs) as absorbents. The absorbents consisting of choline chloride (ChCl), diethylenetriamine (DETA), and ethylene glycol (EG) with different molar ratios show a relatively lower viscosity and higher thermal stability. Here, ChCl/DETA/EG (1:1:2) could take out 0.87 g of SO2/g of solvent at 298.15 K and 1.0 bar. Surprisingly, a SO2 absorption capacity of 0.53 g/g could still be gained under a lower SO2 partial pressure (0.2 bar). Besides, the prepared absorbents also exhibit rapid equilibration time and satisfied reusability, providing a potential alternative strategy for the effective and reversible elimination of SO2.

Synergistic Catalysis of a PtFe-Alloyed Structure on W18O49 for Boosted Sulfide Oxidation

“…Sulfides in diesel fuel oil are a major pollutant, which will cause serious environmental pollution along with fuel combustion and have become the main trigger of acid rain and haze. − Ultradeep desulfurization of fuel oil is becoming increasingly important to slow environmental pollution. Among the various desulfurization technologies, oxidative desulfurization (ODS) has attracted extensive attention, owing to the highly efficient treatment capacity of aromatic sulfides. − The core reaction of ODS is the selective conversion of sulfides to sulfone derivatives in complex solvent systems .…”