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

ABSTRACT

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°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°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/H₂ with high efficiency and stability.

KEYWORDS:

• Cesium carbonate
• CO₂ separation
• gas permeation
• composite polymer
• water-absorbing agent

Disclosure statement

No potential conflict of interest was reported by the author(s).

Additional information

Funding

This study was supported by the Japan Society for the Promotion of Science (JSPS) KAKENHI [Grant number 20K12252].