The LiSiO seems to be an excellent sorbent for CO capture at post-combustion. Our work contributes to understanding the effect of the natural Algerian diatomite as a source of SiO in the synthesis of LiSiO for CO capture at high temperature. For this purpose, we use various molar % (stoichiometric and excess) of calcined natural diatomite and pure SiO. To select the best composition, CO sorption isotherms at 500 °C on the prepared LiSiO are obtained using TGA measurements under various flows of CO in N. The sorbent having 10% molar SiO in diatomite (10%ND-LS) exhibits the best CO uptake, probably due to various factors such as the content of the different secondary phases. A comparative study was performed at 400 to 500 °C on this selected 10%ND-LS and those with stoichiometric composition obtained with diatomite and pure SiO. The obtained isotherms show the endothermic character of CO sorption. In addition, the evolution of isosteric heat highlights the nature of the involved CO/LiSiO interactions, by considering the double-shell mechanism. Finally, the experimental sorption isotherms are confronted with some well-known adsorption models to explain the phenomenon occurring over our prepared sorbents. Freundlich and Jensen-Seaton models present a better correlation with the experimental results.
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