Evaluation of FesupII/supEDTA‐NO reduction by thiourea dioxide in NO removal with FesupII/supEDTA

摘要

titleAbstract/titlepReducing FesupII/supEDTA‐NO is key for NO absorption with FesupII/supEDTA absorbent. In this work, the reducing agent thiourea dioxide (TD) was for the first time employed for reducing FesupII/supEDTA‐NO. The behavior and kinetics of reducing FesupII/supEDTA‐NO with TD had been examined with different pH value, varied TD concentrations, and various temperatures. The results investigated that FesupII/supEDTA‐NO reducing rate rose with pH value increasing as well as elevated temperature. The reaction order of FesupII/supEDTA‐NO by TD was proved to be 2 on FesupII/supEDTA‐NO. Meanwhile, activating energy, activating entropy, and activating enthalpy of reducing FesupII/supEDTA‐NO by TD were separately calculated to be 49.583 kJ molsup?1/sup, ?64.956 J ksup?1/sup molsup?1/sup, and 46.943 kJ molsup?1/sup. The simultaneous reduction of FesupIII/supEDTA and FesupII/supEDTA‐NO by TD was investigated. Results showed that TD was more powerful in reducing FesupIII/supEDTA and FesupII/supEDTA‐NO compared with other reduction systems. Finally, nitric oxide removal experiment illustrates that TD can remarkably strengthen the NO removal with FesupII/supEDTA solution. These theoretical findings could provide constructive suggestions for industrial tail gas denitrification employing associative FesupII/supEDTA and TD system./p