Selective CO₂ permeation properties of a membrane composed of a three-component polymer blend and cesium carbonate

A high-performance CO2 separation membrane was fabricated using a composite polymer composed of a crosslinked acrylic acid polymer sodium salt, sodium polyacrylate, polyvinyl alcohol, and cesium carbonate. Evaluation tests were conducted by varying the relative humidity (RH), temperature, total pressure (P-total), and CO2 partial pressure (P-CO2) to determine optimal parameters for enhanced performance in selective CO2 permeation over He. The membrane shows a high separation performance and durability at 50% RH and 85 & DEG;C, where the CO2/He selectivity exceeds 550 under conditions of P-total:0.1 MPa and P-CO2:0.08 MPa. Furthermore, the operational stability of the membrane was evaluated at 85 & DEG;C, 50% RH, P-total:0.7 MPa, and P-CO2:0.56 MPa. The as-fabricated membrane was stable for 300 h of continuous operation in the separation performance evaluation test. The findings of this study suggest that the developed membranes can be applied for CO2 separation from gas mixtures such as CO2/H-2 with high efficiency and stability.