Study on Metal Chelation Adsorption of NO Using Fe(II)EDTA Solution in Power Plant

The influences of concentration of metal chelation solution, pH values, the concentration of O 2 supplied by some thermal power plants in Wuxi, and the concentration of SO 3 2- on the adsorption performance were studied. The results indicated that the removal ratio improved with the increase of bulk concentration. However, when the concentration exceeded 15mmol/L, the increase rate reduced. It was found that the chelation ability enhanced with the increase of pH values as well as the decrease of oxygen concentration in the flue gas. The SO 3 2- in the solution was beneficial to improve and extend the adsorption capacity of Fe (II) EDTA. According to the FI-IR, the carboxyl in Na 2 EDTA coordinated with Fe(II). XPS showed that Fe 2+ was the main valence of Fe in Fe(II)EDTA. Through the calculation of fold peak area, the content of Fe 2+ was 72.17%. And the existence of Fe 2+ in the Fe(II)EDTA was pivotal for the complexation.