Wet catalytic oxidation upcycling semi-dry flue gas desulfurization ash to sustainable gypsum.

ABSTRACT: Semi-dry flue gas desulfurization ash (SFGDA), rich in calcium sulfite (CaSO₃) and highly alkaline, poses challenges for direct reuse due to its instability and slow oxidation. This review synthesizes recent advances in wet catalytic oxidation (WCO) that transform CaSO₃ into construction-grade calcium sulfate (CaSO₄). We frame homogeneous and heterogeneous radical-chain routes and lattice-defect activation, underscoring how Mn/Co/Fe redox cycles and oxygen-vacancy engineering accelerate conversion. Performance comparisons span conventional salts, metal-organic frameworks (MOFs), perovskites, and nanostructured catalysts, with Co-MOFs achieving 96% oxidation in 3 h and MnTiO₃ lowering activation energy by 40%. Process optimizations ultrasound assi

SUBMITTER: Xiong HQ 

PROVIDER: S-EPMC12481077 | biostudies-literature | 2025 Oct

REPOSITORIES: biostudies-literature