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Removal of NO in flue gas simulated by Fe2+/Cu2+ activated double oxidant system.

The wet denitrification technology has a good development prospect due to its simple system and mild reaction conditions, and the related research has become a hot topic in the field of flue gas purification. In this work, a novel simultaneous removal technology of NO from flue gas using Fe2+/Cu2+-catalytic H2O2/(NH4)2S2O8 system was developed for the first time. The feasibility of this new flue gas cleaning technology was explored through a series of experiments and performance analysis. The mechanism of oxidation products, free radicals and simultaneous removal of NO was revealed. The effects of the main process parameters on the removal of NO were investigated. Relevant results demonstrated that removing efficiency of NO was elevated when concentration of (NH4)2S2O8 or reacting temperature increased, while it was decreased after increasing by the raising of Fe2+, Cu2+ and H2O2 concentrations. The main radicals was ·OH and·SO4-, using electron spin resonance technique in the solution, and played very important role in NO removal. The main products was carried out by ion chromatography and elemental N material accountancy, and the results showed that it was sulfate and nitrate in the solution, which provided theoretical guidance for the subsequent treatment and resource utilization of absorption solution. The results of the study provided a theoretical basis for the industrial application of wet denitrification.