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Evaluation of Fe II EDTA‐NO reduction by thiourea dioxide in NO removal with Fe II EDTA
Author(s) -
He Feiqiang,
Zhu Xinyu,
Chen Xianchun,
Ding Jianhua
Publication year - 2019
Publication title -
asia‐pacific journal of chemical engineering
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.348
H-Index - 35
eISSN - 1932-2143
pISSN - 1932-2135
DOI - 10.1002/apj.2397
Subject(s) - chemistry , reducing agent , thiourea , inorganic chemistry , enthalpy , nuclear chemistry , physics , organic chemistry , quantum mechanics
Reducing Fe II EDTA‐NO is key for NO absorption with Fe II EDTA absorbent. In this work, the reducing agent thiourea dioxide (TD) was for the first time employed for reducing Fe II EDTA‐NO. The behavior and kinetics of reducing Fe II EDTA‐NO with TD had been examined with different pH value, varied TD concentrations, and various temperatures. The results investigated that Fe II EDTA‐NO reducing rate rose with pH value increasing as well as elevated temperature. The reaction order of Fe II EDTA‐NO by TD was proved to be 2 on Fe II EDTA‐NO. Meanwhile, activating energy, activating entropy, and activating enthalpy of reducing Fe II EDTA‐NO by TD were separately calculated to be 49.583 kJ mol −1 , −64.956 J k −1 mol −1 , and 46.943 kJ mol −1 . The simultaneous reduction of Fe III EDTA and Fe II EDTA‐NO by TD was investigated. Results showed that TD was more powerful in reducing Fe III EDTA and Fe II EDTA‐NO compared with other reduction systems. Finally, nitric oxide removal experiment illustrates that TD can remarkably strengthen the NO removal with Fe II EDTA solution. These theoretical findings could provide constructive suggestions for industrial tail gas denitrification employing associative Fe II EDTA and TD system.