Characterization of Mg-Al layered double hydroxide intercalated with CO₃^2- for HCl removal

Abstract

The exhaust gas emitted from waste incineration facilities contains acid gas such as HCl, SOx, NOx, which needs to be treated properly. In the dry process for acid gas treatment, HCl and SOx are neutralized through the spraying of slaked lime (Ca(OH)₂). The neutralization products such as CaCl₂ are disposed of in landfills. However, leachate containing a high concentration salt releases from the landfills sites during rainfall. Consequently, it is needed to create an acid gas treatment process that does not generate neutralization products. Mg-Al layered double hydroxide intercalated with CO₃^2- (CO₃･Mg-Al LDH) can remove acid gas and regenerate its structure through anion exchange. It enables the development of novel acid gas recycling process using CO₃･Mg-Al LDH. This study aims to control the chemical properties of CO₃･Mg-Al LDH and achieve advanced acid gas treatment. And it investigates the characteristics of CO₃･Mg-Al LDH with high HCl removal capacity.