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

Tomohito Kameda, Hiroki Uchida, Shogo Kumagai, Yuko Saito, Keiichi Mizushina, Ichirou Itou, Tianye Han, Toshiaki Yoshioka

Research output: Contribution to journalArticlepeer-review

Abstract

Mg-Al layered double hydroxide intercalated with CO32− (CO3·Mg-Al LDH) is effective for treating HCl exhaust gas. HCl reacts with CO32− 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 CO32−. Therefore, anion exchange occurred between CO32− and Cl in the Cl·Mg-Al LDH, thus desorbing Cl.

Original languageEnglish
JournalChinese Journal of Chemical Engineering
DOIs
Publication statusAccepted/In press - 2020

Keywords

  • CO gas
  • Cl desorption
  • Mg-Al layered double hydroxide
  • Semi-dry method

ASJC Scopus subject areas

  • Environmental Engineering
  • Biochemistry
  • Chemistry(all)
  • Chemical Engineering(all)

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