Abstract
The paper presents a study of the effect of chemical modification of natural Shankanay zeolite with sodium and magnesium oxides on its sorption properties for carbon dioxide (CO2) at high temperatures. The sorbents were obtained by mixing followed by the introduction of 10 wt.% Na2O or MgO. A comprehensive characterization of the samples was carried out using X-ray phase analysis (XRD), scanning electron microscopy (SEM) and temperature-programmed desorption of CO2 (TPD-CO2). It was found that the Na2O modification significantly increases the number of strong basic centers, providing a high sorption capacity of up to 33.5% at 400 °C. The cyclic tests (16 cycles) showed satisfactory stability of the sorbent. The results indicate the promise of zeolite Na₂O/Sh 6/1 as an effective high-temperature CO2 sorbent.