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In this work, potassium fluoride-doped Ca-Mg-Al layered double hydroxides (CaMgAl-LDHs) were synthesized by a coprecipitation method, after which they were further used as strong adsorbents for HCl gas adsorption in a quartz reactor at high temperature. The physiochemical properties of the as-prepared KF/CaMgAl-LDHs and CaMgAl-LDHs were investigated by X-ray diffraction, thermogravimetric, scanning electron microscopy, energy-dispersive system, and Brunauer-Emmett-Teller. The HCl adsorption test showed that 25 wt % KF loading of the KF/CaMgAl-LDOs was the optimal adsorbent for HCl removal. The highest adsorption capacity of the KF/CaMgAl-LDH adsorbent was achieved with 0.2968 g at 600 °C, 500 ppm HCl concentration, and 0.5 g adsorbent. Furthermore, the microstructure of the adsorbents after the reaction revealed that the adsorbents were encapsulated by dense chloride. The adsorption process was mainly dominated by chemical adsorption, strong acid-base properties, specific surface area, and mesopore number.

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Synthesis, Characterization, and High-Temperature HCl Capture Capacity of Different Proportions of Potassium Fluoride-Doped CaMgAl Layered Double Hydroxides