Study on NO Removal Characteristics of the Fe(II)EDTA and Fe(II)PBTCA Composite System

[Image: see text] Fe(2+) complexation wet denitrification technology has become a research hotspot. It is very important to achieve efficient regeneration of the absorbent and increase NO absorption in the Fe(2+) complexation system. They are the key to the industrial application of the Fe(2+) complexation absorption process. In this paper, 2-phosphonate-butane-1,2,4-tricarboxylic acid and ethylenediamine tetraacetic acid were used as ligands to prepare a composite system for the first time. The characteristics of NO removal were investigated under different temperatures, pHs, Fe(2+) concentrations, O(2) contents, NO concentrations, CO(2) contents, and SO(2) concentrations. Compared with the single ligand, the results show that the denitrification performance of the solution with a complex ligand is significantly improved. In this system, pH 9, 40 °C temperature, and 20 mmol/L Fe(2+) concentration are the economic ideal conditions for NO removal. The system can realize simultaneous removal of NO and SO(2), but SO(2) in flue gas has a dual effect on the NO removal reaction.