Simultaneous absorption of NOX and SO2 using hexamminecobalt (II) iodide solution

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A cost-effective technology will be developed for simultaneous absorption of NOx and SO2 for flue gases using novel catalysts. Hexamminecobalt (II) and iodide ions are the co-catalysts which can be regenerated with UV irradiation. Most importantly, SO2 will actually be beneficial to the removal of NOx in this novel solvent and the corresponding efficiencies of NOx and SO2 could be much higher than those reported in literature. The emission control efficiency is expected to be further enhanced by high contact areas between the gases and liquid phases using a properly designed spray tower. Such a catalyst system may be introduced to existing ammonia-based scrubbers (such as ammonia solution) without major modifications needed. The products of ammonium sulfate and ammonium nitrate can be used as a feedstock for fertilizer industry.