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

• 来源期刊: 中国化学工程学报（英文版）
• 年，卷（期）: 2021,（1）
• 所属期刊栏目: Separation Science and Engineering
• 页码范围: 131-134
• 页数: 4页
• 语种: 英文

摘要

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-.