MgO/CaO-Loaded\nActivated Carbon for Carbon Dioxide Capture: Practical Aspects of\nUse

Abstract

Porous\ncarbons loaded with CaO and MgO were prepared through a one-step process\nfrom mixtures of poly­(ethylene terephthalate) and dolomite mineral.\nObtained hybrid materials were examined as sorbents for CO₂ gas contained in air. The influence of pore structure, loadings\nof the oxides, moisture, and temperature on the efficiency of gas\nremoval is presented and discussed. Performance of the materials during\nCO₂ capture was confirmed to be influenced by all mentioned\nfactors. As a rule, efficiency of CO₂ removal increased\nalong with loading of the oxides. CO₂ uptake increased\nalso with moisture content and temperature of the bed. On the basis\nof attained results, optimal parameters for operational use are suggested\nand probable mechanisms of the CO₂ removal from dry and\nhumid air are proposed. Cyclic sorption–desorption experiments\nconfirmed capability of the material for several-times use. Superior\nperformance of the hybrid materials over a mixture of CaO and MgO\nis confirmed and discussed.