Catalytic oxidation removal of typical sinter flue gas volatile organic compounds by CoMn binary spinel via peroxymonosulfate wet scrubbing

Abstract

Volatile organic compounds (VOCs) emission contributed to atmospheric pollution and health threat. Herein, cobalt-manganese spinel catalysts were prepared by using different methods and were taken as peroxymonosulfate (PMS) activator for catalytic oxidation of typical sintering flue gas VOCs in a continuous air bubbling system. The results indicated that cobalt-manganese spinel prepared using solvent-free molten method exhibited superior catalytic toluene oxidation performance. Under optimized condition of 0.1 g/L catalyst and 5 g/L PMS dosage, toluene conversion rate exceeded 90 % in 120 min. Electron spin resonance and quenching experiments revealed the dominant role of sulfate and hydroxyl radicals in the VOCs oxidation process. The powerful sulfate radical (SO_4^⋅−) and hydroxyl radical (·OH) were abundantly generated to oxidize toxic VOCs into soluble small molecules, which could be finally mineralized into CO₂. Furthermore, the application potential was evaluated by taken simulating sinter flue gas which containing mixed VOCs components as targeting pollutant. The findings can provide alternative guidance for the treatment of various VOCs emitted from industrial process under mild condition.