Reduction of FeII(EDTA)-NO by Mn powder in wet flue gas denitrification technology: stoichiometry, kinetics, and thermodynamics
2019
Chen, Jun | He, Jinjia | Wang, Xiaoping | Hrynsphan, Dzmitry | Wu, Jiali | Chen, Jianmeng | Yao, Jiachao
Conversion of Feᴵᴵ(EDTA)-NO or Feᴵᴵᴵ(EDTA) into Feᴵᴵ(EDTA) is a key process in a wet flue gas denitrification technology with Feᴵᴵ(EDTA) solution. In this work, the stoichiometry, kinetics, and thermodynamics of Feᴵᴵ(EDTA)-NO reduction by Mn powder were investigated. We first studied the Feᴵᴵ(EDTA)-NO reduction and product distribution to speculate a possible stoichiometry of Feᴵᴵ(EDTA)-NO reduction by Mn powder. Then, the effects of major influencing factors, such as pH value, temperature, and Mn concentration, were studied. The pseudo-second-order model was established to describe the Feᴵᴵ(EDTA)-NO reduction. Simultaneously, according to Arrhenius and Eyring-Polanyi equations, the reaction activation energy (Eₐ), enthalpy of activation (∆H‡), and entropy of activation (∆S‡) were calculated as 23.68 kJ/mol, 21.148 kJ/mol, and − 149.728 J/(k mol), respectively. Additionally, simultaneous reduction of Feᴵᴵᴵ(EDTA) and Feᴵᴵ(EDTA)-NO was investigated to better study the mechanism of Feᴵᴵ(EDTA) regeneration, suggesting that there was a competition between the two reduction processes. Finally, a simple schematic mechanism of NO absorption by Feᴵᴵ(EDTA) combined with regeneration of manganese ion and ammonium was proposed. These fundamental researches could offer a valuable guidance for wet flue gas denitrification technology with Feᴵᴵ(EDTA) solution.
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