ETS-10, the well-known member of titanosilicates, was synthesized, characterized, and then employed to study CO₂ and CH₄ adsorption on its cation exchanged forms. Equilibrium isotherms of as-synthesized, K-, Mg-, and Sr-ETS-10 were analyzed at 298 K and pressures up to 100 kPa. High selectivities of CO₂/CH₄ were observed for all the adsorbents. By a closer look at equilibrium isotherms, adsorption selectivity was found to be in the order of K- > as-synthesized- > Sr- > Mg-ETS-10. Analyses of the data revealed that ETS-10 adsorbents containing monovalent cations have more rectangular isotherms and higher CO₂/CH₄ selectivity. On the other hand, ETS-10 adsorbents exchanged by divalent cations showed lower selectivity but more curvature isotherms which makes the regeneration easier in the pressure swing adsorption process (PSA). High-pressure adsorption experiments at different temperatures up to 348 K were also studied for the most selective adsorbent, i.e., K-ETS-10. Finally, the ETS-10 adsorbents performance in different binary mixtures of CO₂/CH₄ was investigated by Ideal Adsorption Solution Theory (IAST), and the results were evaluated and compared with the performance of other aluminosilicates and high silica zeolites in CO₂/CH₄ separation. The comparison led to a new trade-off plot, i.e., adsorption capacity versus CO₂/CH₄ selectivity, which can be helpful for adsorbent selection.

合成，表征了钛硅酸盐的知名成员ETS-10，然后将其用于研究CO ₂和CH ₄对阳离子交换形式的吸附。在298 K和最高100 kPa的压力下分析了合成后的K-，Mg-和Sr-ETS-10的平衡等温线。对于所有吸附剂，观察到高选择性的CO ₂ / CH ₄。仔细观察平衡等温线，发现吸附选择性的顺序为K->合成后-> Sr-> Mg-ETS-10。数据分析表明，含有一价阳离子的ETS-10吸附剂具有更多的矩形等温线和更高的CO ₂ / CH ₄选择性。另一方面，通过二价阳离子交换的ETS-10吸附剂显示出较低的选择性，但曲率等温线更大，这使得变压吸附过程（PSA）的再生更加容易。还针对选择性最强的吸附剂，即K-ETS-10，在高达348 K的不同温度下进行了高压吸附实验。最后，通过理想吸附溶液理论（IAST）研究了在不同的CO ₂ / CH ₄二元混合物中ETS-10吸附剂的性能，并对结果进行了评估并与其他铝硅酸盐和高硅沸石在CO ₂ / CH ₄分离。比较得出了一个新的权衡图，即吸附量与CO _2的关系/ CH ₄选择性，有助于选择吸附剂。