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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-.