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Hydrochloric Acid‐Assisted Regeneration of Cobalt Ethylenediamine for NO x Remediation in Flue Gas
Author(s) -
Yang Jie,
Liu Shengyu,
Fu Qianwen,
Li-Chao Nengzi,
Chen Li
Publication year - 2021
Publication title -
chemical engineering and technology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.403
H-Index - 81
eISSN - 1521-4125
pISSN - 0930-7516
DOI - 10.1002/ceat.202100129
Subject(s) - ethylenediamine , cobalt , flue gas , chemistry , hydrochloric acid , environmental remediation , hydrogen chloride , inorganic chemistry , nuclear chemistry , contamination , organic chemistry , ecology , biology
Cobalt ethylenediamine ([Co(en) 3 ] 3+ ) is widely used for NO x remediation in flue gas. However, its industrial applications are limited due to the lack of an efficient regeneration method that converts Co 3+ to Co 2+ . Here, hydrogen chloride is applied as an additive and the performance of cobalt ethylenediamine under variable flue gas compositions is analyzed. The results demonstrate that low pH values favor the conversion of Co 3+ to Co 2+ . Further, a reaction temperature of 100 °C and more than three minutes reaction time were found to accelerate the reduction of Co 3+ . The NO x removal efficiency could reach more than 70 % after the first regeneration. After 23 consecutive days of continuous experiments, the denitration efficiency of flue gas could be as high as 60 % or more.