Low-voltage gaseous HCl electrolysis with an iron redox-mediated cathode for chlorine regeneration
Zhao, Yun Gu, Shuang Gong, Ke Zheng, Jie Wang, Junhua Yan, Yushan
Zhao, Yun
Gu, Shuang
Gong, Ke
Zheng, Jie
Wang, Junhua
Yan, Yushan
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2017-08-28
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Chlorine regeneration,Electrochemistry,Energy consumption,HCl electrolysis,Redox cathode
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Citation
Y. Zhao, S. Gu, K. Gong, J. Zheng, J. Wang, Y. Yan, Angew. Chem. Int. Ed. 2017, 56, 10735
Abstract
Gaseous HCl as a by-product is often produced from chlorination processes using Cl-2 gas. Onsite Cl-2 regeneration from HCl is highly desirable as it eliminates the need to buy new Cl-2 and dispose HCl waste. A gaseous HCl electrolysis with Fe3+/Fe2+ redox-mediated cathode is demonstrated for Cl-2 regeneration. HCl is oxidized to generate Cl-2 and protons in the anode while Fe3+ is reduced to Fe2+ in the cathode. Simultaneously Fe3+ is regenerated by chemical oxidation of Fe2+ by oxygen (air) that also produces water. A low operational voltage and high coulombic efficiency are achieved by using a novel composite porous membrane and hydrophobic anode. Specifically, a cell voltage of only 0.64 Vis needed at the typical current density of 4 kA m(-2), leading to a low energy consumption of 483 kWh per ton of Cl-2 (124 kJ mol(Cl2)(-1)) which is about 50-55% of state-of-the-art HCl electrolysis processes.
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John Wiley & Sons, Inc.
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Angewandte Chemie-International Edition;v.56:no.36
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1433-7851