Desorption of Cl- from Mg-Al layered double hydroxide intercalated with Cl- using CO2 gas and water

doi:10.1016/j.cjche.2020.07.015

摘要/Abstract

摘要： Mg-Al layered double hydroxide intercalated with CO₃^2- (CO₃·Mg-Al LDH) is effective for treating HCl exhaust gas. HCl reacts with CO₃^2- in CO₃·Mg-Al LDH, resulting in the formation of Cl·Mg-Al LDH. We propose that CO₂ can be used for the desorption of Cl^- from Cl·Mg-Al LDH to regenerate CO₃·Mg-Al LDH. Herein, we studied the desorption of Cl^- from Cl·Mg-Al LDH by adding water to Cl·Mg-Al LDH and blowing CO₂ into it. We also analyzed the effects of temperature and water addition speed on the desorption of Cl^- from Cl·Mg-Al LDH. Our results show that the added water adhered to Cl·Mg-Al LDH and that CO₂ in the gaseous phase was dissolved in this adhered water, thus generating CO₃^2-. Therefore, anion exchange occurred between CO₃^2- and Cl^- in the Cl·Mg-Al LDH, thus desorbing Cl^-.

关键词: Mg-Al layered double hydroxide, CO₂ gas, Cl^- desorption, Semi-dry method

Abstract: Mg-Al layered double hydroxide intercalated with CO₃^2- (CO₃·Mg-Al LDH) is effective for treating HCl exhaust gas. HCl reacts with CO₃^2- in CO₃·Mg-Al LDH, resulting in the formation of Cl·Mg-Al LDH. We propose that CO₂ can be used for the desorption of Cl^- from Cl·Mg-Al LDH to regenerate CO₃·Mg-Al LDH. Herein, we studied the desorption of Cl^- from Cl·Mg-Al LDH by adding water to Cl·Mg-Al LDH and blowing CO₂ into it. We also analyzed the effects of temperature and water addition speed on the desorption of Cl^- from Cl·Mg-Al LDH. Our results show that the added water adhered to Cl·Mg-Al LDH and that CO₂ in the gaseous phase was dissolved in this adhered water, thus generating CO₃^2-. Therefore, anion exchange occurred between CO₃^2- and Cl^- in the Cl·Mg-Al LDH, thus desorbing Cl^-.

Key words: Mg-Al layered double hydroxide, CO₂ gas, Cl^- desorption, Semi-dry method

Tomohito Kameda, Hiroki Uchida, Shogo Kumagai, Yuko Saito, Keiichi Mizushina, Ichirou Itou, Tianye Han, Toshiaki Yoshioka. Desorption of Cl^- from Mg-Al layered double hydroxide intercalated with Cl^- using CO₂ gas and water[J]. 中国化学工程学报, 2021, 29(1): 131-134.

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Desorption of Cl^- from Mg-Al layered double hydroxide intercalated with Cl^- using CO₂ gas and water

Desorption of Cl^- from Mg-Al layered double hydroxide intercalated with Cl^- using CO₂ gas and water

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